REST APIs are the interface between clients and servers that allows for data to be shared across platforms, providing a seamless connection between applications, databases, and other resources. A REST API Developer is the programmer who helps clients connect their applications to a certain platform and ensure data is flowing between the two in an efficient, secure manner. This can help to reduce friction, improve performance & scalability, boost security, streamline website navigation, and more.

REST API Developers build and maintain custom programming to enable automated data retrieval and communication with a client’s desired application or platform. This can encompass services such as quickly integrating third-party payment systems into an existing website, minimizing manual work and improving customer experience. They may also incorporate priority systems; for example creating different APIs for handling bulk vs single requests for heavy workloads. Ultimately a REST API Developer helps clients bridge the gap between complex platforms and transform data into valuable business insights.

Here’s some projects that our expert REST API Developers made real:

  • Establishing communication between different applications
  • Creating priority systems for managing large volumes of requests
  • Integrating third-party payment systems into an existing website
  • Developing programming to seamlessly retrieve dynamic data
  • Designing secure connections to protect confidential information

Our highly-skilled REST API Developers are experts when it comes to stitching together the critical links which connect disparate platforms together. With years of experience they have been able to tackle innumerable projects which have led to successful outcomes for our clients. If you have an issue related to connecting your application with another platform or require automated data retrieval services then you can post your own project here on Freelancer.com and hire one of our experienced developers today!

Baseret på 48,140 bedømmelser, giver vores klienter os REST API Developers 4.91 ud af 5 stjerner.
Ansæt REST API Developers

REST APIs are the interface between clients and servers that allows for data to be shared across platforms, providing a seamless connection between applications, databases, and other resources. A REST API Developer is the programmer who helps clients connect their applications to a certain platform and ensure data is flowing between the two in an efficient, secure manner. This can help to reduce friction, improve performance & scalability, boost security, streamline website navigation, and more.

REST API Developers build and maintain custom programming to enable automated data retrieval and communication with a client’s desired application or platform. This can encompass services such as quickly integrating third-party payment systems into an existing website, minimizing manual work and improving customer experience. They may also incorporate priority systems; for example creating different APIs for handling bulk vs single requests for heavy workloads. Ultimately a REST API Developer helps clients bridge the gap between complex platforms and transform data into valuable business insights.

Here’s some projects that our expert REST API Developers made real:

  • Establishing communication between different applications
  • Creating priority systems for managing large volumes of requests
  • Integrating third-party payment systems into an existing website
  • Developing programming to seamlessly retrieve dynamic data
  • Designing secure connections to protect confidential information

Our highly-skilled REST API Developers are experts when it comes to stitching together the critical links which connect disparate platforms together. With years of experience they have been able to tackle innumerable projects which have led to successful outcomes for our clients. If you have an issue related to connecting your application with another platform or require automated data retrieval services then you can post your own project here on Freelancer.com and hire one of our experienced developers today!

Baseret på 48,140 bedømmelser, giver vores klienter os REST API Developers 4.91 ud af 5 stjerner.
Ansæt REST API Developers

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    I want to launch a full-featured web platform where users can swap value across different digital ecosystems. The exact mix of assets is still open for discussion—I might start with mainstream cryptocurrencies, expand to popular in-game coins, or even fold in loyalty points once the core is stable—so the architecture needs to stay modular and asset-agnostic. Here’s what I need from you: • A scalable backend that can plug into multiple asset ledgers (blockchain nodes, game publisher APIs, loyalty program endpoints) without rewriting core logic. • Secure user accounts with 2FA, encrypted wallets, and a clean audit trail of every transaction. • A matching engine that handles simple market/limit orders, shows real-time order book depth, and calculates fee...

    €575 Average bid
    €575 Gns Bud
    9 bud

    I’ve reached the point where our Salesforce org needs deeper tailoring to match our internal processes. My immediate priority is system configuration—specifically building out custom objects and fields that reflect our data model, then automating routine actions with Workflows, Process Builder or Flows (whichever proves most efficient). Beyond that core setup, I also need the environment ready for integrations with at least one external system. Exact platforms will be discussed once we connect, but expect REST- or SOAP-based API work, authentication setup, and field-level mappings to bring data in and out of Salesforce smoothly. Deliverables • New custom objects, fields and relationships fully deployed to production • Automation logic (Workflow Rules, Proces...

    €11 / hr Average bid
    €11 / hr Gns Bud
    12 bud
    AI Marketplace Web App
    6 dage left
    Godkendt

    I’m launching a start-up and need a seasoned full-stack partner to take the product from concept to production. The core idea is a three-sided, AI-powered marketplace and lets me manage everything from one place. Scope in a nutshell • Build the public-facing user portal with , Tailwind and Framer Motion. It must feel lightning-fast and modern, with smooth page-transition animations. • Develop a dedicated dashboard where owners can manage bookings, see real-time analytics and handle payouts. • Create an admin portal so I can approve applications, oversee users, tweak fees and pull platform reports without touching the codebase. • Stand up an + MongoDB backend, expose clean REST APIs and keep things modular for future micro-services. • Train or inte...

    €1313 Average bid
    €1313 Gns Bud
    138 bud

    FlutterFlow API Integration & UI Logic Wiring This project is strictly frontend logic wiring in FlutterFlow. Backend is already deployed on Railway and fully functional. All required APIs are live and returning 200 OK when tested. No backend changes are allowed. Tech Stack Frontend: FlutterFlow Backend: Existing REST APIs (already connected & tested) Method: POST Response format: JSON Screens & UI Elements (Already Created) Questionnaire page with inputs Q1 – Q10 “Submit Questionnaire” button Result page with Text Widget (output display) “Ask Any Question” input field “Ask” button Loading indicator widget Error display (Snackbar / Text) Tasks to Implement 1. Questionnaire Submission Flow Collect values from Q1–Q10 Combine them int...

    €17 Average bid
    €17 Gns Bud
    19 bud

    FlutterFlow API Integration & UI Logic Wiring This project is strictly frontend logic wiring in FlutterFlow. Backend is already deployed on Railway and fully functional. All required APIs are live and returning 200 OK when tested. No backend changes are allowed. Tech Stack Frontend: FlutterFlow Backend: Existing REST APIs (already connected & tested) Method: POST Response format: JSON Screens & UI Elements (Already Created) Questionnaire page with inputs Q1 – Q10 “Submit Questionnaire” button Result page with Text Widget (output display) “Ask Any Question” input field “Ask” button Loading indicator widget Error display (Snackbar / Text) Tasks to Implement 1. Questionnaire Submission Flow Collect values from Q1–Q10 Combine them int...

    €8 Average bid
    Garanteret
    €8
    3 indlæg

    Product Overview P2P Crypto Marketplace for Digital Goods A decentralized, escrow-backed peer-to-peer marketplace enabling users to safely trade digital goods (subscriptions, gift cards, licenses, accounts) using cryptocurrency, launched as a Telegram Mini App for instant global reach. The platform eliminates trust issues in digital goods trading by combining KYC verification, smart-contract escrow, and multi-step trade validation. Core Value Proposition Trade digital goods globally with crypto—without trust, fraud, or delays. No chargebacks No middleman holding funds No long onboarding Built for crypto users, not adapted for them How It Works (Trade Flow) User Verification Telegram login (one-tap) Mandatory KYC (basic → advanced tiers) Wallet connection (EVM-comp...

    €221 Average bid
    €221 Gns Bud
    2 bud

    NOTE - This position is for full-time freelancers, No Agencies please !! Apply with you Resume. Once the resume is shortlisted, you will have 2 rounds of interviews. Per hour rate - INR 750 Max. We’re looking for a strong full-stack developer for one of our Clients with deep experience in Node.js + TypeScript to own the end-to-end delivery of complex applications. You will move beyond standard CLI builds to architect self-hosted applications and robust backend services that integrate seamlessly with the Wix ecosystem and other platforms to follow We are a forward-thinking team that embraces modern efficiency: you will be expected to leverage AI tools like Claude Code and Cursor to accelerate development speed, streamline refactoring, and maintain high-velocity output without sacrif...

    €5 / hr Average bid
    €5 / hr Gns Bud
    22 bud

    I’m ready to turn a fresh idea into a fully-functional web-based e-commerce application. The goal is straightforward: build a fast, secure storefront that lets shoppers browse products, add them to a cart, and check out seamlessly on any modern browser. What I already have: the product concept, user flow sketches, and a clear list of must-have features. What I still need is the complete application—front end, back end, database, and payment integration—delivered as clean, well-documented code that I can host on my own server. Key expectations • Responsive interface that works smoothly on desktop and mobile browsers • Intuitive product catalog, search, and filter tools • Secure user accounts with password reset, email verification, and order history ...

    €10 / hr Average bid
    €10 / hr Gns Bud
    67 bud

    I’m building Curacare, a full-stack web app that lets people handle medical emergencies without scrambling for information. The heart of the platform is a seamless doctor-consultation flow, so the appointment-scheduling module has to feel effortless on both mobile and desktop. Alongside that core feature, users must be able to reach hospitals instantly through a dedicated “Contact Hospital” pathway—click-to-call, email, or any direct channel you suggest—surfaced within one tap from the dashboard. Speed and reliability matter more than bells and whistles: every interaction should load in under a second, and every piece of patient data must be encrypted at rest and in transit. Tech-stack choices are open, though I’m leaning toward a React front-end, ...

    €264 Average bid
    €264 Gns Bud
    37 bud

    .NET Developer – Production Support & Evolutionary Maintenance We are looking for a .NET Developer to actively participate in technical support, evolutionary maintenance, and continuous improvement of production systems. This role combines incident resolution, analysis of existing systems, and the development of functional and technical enhancements, working on both standalone solutions and SaaS products used by real clients and operating on platforms with high operational impact. Required Technical Skills - Backend / Microsoft Platform - Strong knowledge of .NET Framework 4.8 or higher, with experience developing, maintaining, and improving applications in production environments - Experience with Entity Framework (Code First and/or Database First), including relationship han...

    €8 / hr Average bid
    €8 / hr Gns Bud
    23 bud

    I need a single-page performance management system built with the latest Angular release, TypeScript, and RxJS. All data will come from my live REST endpoints for employee evaluations, goals & KPIs/KRAs, and feedback & assessments, so every screen must perform full CRUD operations against those services rather than mock data. The UI must rely on Progress Kendo for Angular components—grids, forms, modals, and chart widgets—stitched together into clean, data-driven dashboards. Tables should support sorting, filtering, paging, and inline edits; charts need interactive hover states and drill-downs. Routing should be configured for clear URL paths, guarded by role-based access for Admin, Manager, and Employee functions. State management is required (NgRx or a comparable Ang...

    €2 / hr Average bid
    €2 / hr Gns Bud
    4 bud

    I am building a single-page, online performance management system that leans heavily on dashboards and analytics rather than e-commerce or social networking flows. The back-end REST APIs are already in place; what I need is a focused front-end expert who can translate those endpoints into an elegant, fully responsive user experience using three core tools: Angular (latest stable version), Tailwind CSS v4, and the Progress UI component suite. The product scope covers employee evaluations, goal tracking, ongoing feedback, KPI and KRA monitoring, and periodic assessments. Each of these areas will require data-driven views—tables, forms, modals, and interactive charts—tied seamlessly to the API layer. You will also set up routing, state management, and role-based access so that ma...

    €5986 Average bid
    €5986 Gns Bud
    76 bud

    I’m building a fully native mobile application that lets drivers book automotive services The core flow is simple: users create an account (email, phone, or social login),check real-time availability, reserve a time, then pay securely without ever leaving the app. Both iOS and Android need to feel identical in look and speed, so I’m expecting Swift/SwiftUI on the Apple side and Kotlin with Jetpack on Android, backed by a single REST or GraphQL API. South African gateway must handle payments, supporting saved cards and one-touch checkout via Credit Card (VISA) or selected electronic transfers as well as PayPal etc. Please show me past work that demonstrates: • native builds (no hybrid wrappers) • secure login implementation • a live payment gateway...

    €6 / hr Average bid
    €6 / hr Gns Bud
    57 bud

    Freelance Frontend Engineer – 2D Floor Plan Generator (React + Canvas + Geometry) About the Project We are building a 2D AI-assisted floor plan generator for OneCasa, a real estate and construction-tech platform. The system will automatically generate editable 2D house layouts based on user inputs such as: Plot size (Width × Length) BHK type Facing direction Floors Vastu preference Parking / Balcony requirement This is a draft-generation tool (not AutoCAD-level software). Project Objective Build a smart 2D layout engine that: Generates a floor plan automatically Ensures rooms fit within plot boundaries Prevents room overlap Maintains realistic adjacency rules Allows drag and resize editing Exports layout as PNG Stores layout as JSON OpenAI will be used for suggestion logic (ro...

    €224 Average bid
    €224 Gns Bud
    19 bud

    We are looking for a technical SEO / WordPress performance specialist to fix PageSpeed Insights, Core Web Vitals, and accessibility issues on our website: Website: Platform: WordPress Booking system: VikRentCar (WordPress plugin) This is not a content or link-building SEO job. We need a developer-level specialist who can work directly with WordPress code, themes, and plugins.

    €134 Average bid
    €134 Gns Bud
    124 bud

    Position: Freelance Smart Contract / Blockchain Engineer Type: Contract / Freelance Location: 100% Remote Workload: Part-time or task-based Compensation: $60–$100/hour (or fixed-price per task) About the Project We are working on DeFi smart contract components, including token implementations and protocol-level logic. Our focus is security, clarity, and real-world usability — not hype. We are building a long-term freelancer pool and looking for engineers who can deliver clean, well-structured Solidity code independently. What You’ll Do Design and implement secure smart contracts using Solidity Work with EVM-compatible chains Review and improve existing smart contract code Follow best practices for documentation, testing, and security Collaborate asynchronously wi...

    €8 / hr Average bid
    €8 / hr Gns Bud
    7 bud

    I’m looking for an experienced WordPress plugin developer who can build a clean, reliable, and user-friendly plugin for my website. This is a new plugin build, not a small tweak. The plugin must be lightweight, fast, secure, and compatible with modern WordPress standards. I will provide the plugin idea, required features, branding details if needed, and examples of similar plugins I like. You will design and develop the plugin with a clear admin settings page, consistent UI, and easy configuration so I can manage it later without breaking anything. The code should follow WordPress best practices, include proper validation and sanitization, and be tested on the latest WordPress version. Scope expectations: You will deliver the full plugin files, installation instructions, and short ...

    €133 Average bid
    €133 Gns Bud
    244 bud

    Role Overview: We are seeking an experienced Codebeamer Developer with strong expertise in ALM (Application Lifecycle Management), system configuration, and integrations. The ideal candidate will play a key role in designing, customizing, and optimizing Codebeamer solutions aligned with business and engineering requirements. Key Responsibilities: Design, configure, and customize Codebeamer ALM solutions Develop workflows, templates, trackers, and automation rules Implement and manage Codebeamer integrations with tools such as Jira, Git, DOORS, etc. Support requirements management, test management, and traceability Collaborate with cross-functional teams (Engineering, QA, Product, Compliance) Troubleshoot, optimize, and enhance system performance Participate in system upgrades and migratio...

    €5 / hr Average bid
    €5 / hr Gns Bud
    11 bud

    I’m building CareSync, an AI-assisted medication manager that puts caregivers first. The goal is a seamless experience on both Android and the web where a single profile, stored in Firebase Firestore, keeps every prescription, reminder and adherence metric perfectly in sync. The stack is locked in: • Python Flask will expose a clean, versioned REST API. • Firebase Auth secures every call, and Firestore holds all structured data. • Android is written in Kotlin, following Jetpack best practices and a repository-pattern clean architecture. • A lightweight web dashboard (React, Flutter Web or another modern framework you’re comfortable with) should consume the same endpoints so information mirrors in real time. Core functionality I need you to deliver...

    €357 Average bid
    €357 Gns Bud
    40 bud

    We are looking for an experienced AI/Backend Engineer (or small team) to help design and implement a foundational setup for an enterprise “Agentic AI” goal is to enable a prompt-based interface where business users can ask questions and trigger actions across internal risk management and document systems through a governed API layer. This is NOT a chatbot UI project focuses on backend architecture, AI orchestration, and secure enterprise integration. Target application includes IBM OpenPages SaaS (GRC) accessed via REST APIs. The first phase will implement a proof-of-concept that allows an AI agent to retrieve and update structured records using approved APIs via a secure middleware service. Scope of Work (Phase-1: Foundational Setup) Build a secure middleware API servic...

    €77 Average bid
    €77 Gns Bud
    25 bud

    • Description We have a small Python script which needs to be put on the server-side as an API. Excluding the GUI code and comments, the script has about 750 lines. You will be given a VPS, which the API will allow downstream applications to call the engine for data comparison. We need multiple real-time endpoints for downstream applications. For testing purposes, we will set the maximum to 3 for now. Ultimately, it can be scaled to an unlimited number of real-time comparisons. I suppose we will have multiple copies of the comparison code on the same/different servers, but with three REST API endpoints. Hence, the Python script will be split into server and client-side code. As there are multiple data points to be compared with, we are thinking that the web app will first initiate...

    €166 Average bid
    €166 Gns Bud
    122 bud

    We’re hiring a strong full-stack developer for an ongoing role. You’ll start part-time and can move to full-time based on performance and fit. We are building an AI character platform and you’ll work on cutting-edge systems across: * AI image generation * AI text generation * Memory systems * RAG pipelines * Agentic workflows * Frontend and backend product development What You’ll Do * Maintain and improve our production + Laravel platform * Build features end-to-end (UI, APIs, data model changes) * Debug and resolve issues quickly with high reliability * Improve performance, quality, and system robustness * Collaborate on architecture and ship pragmatic solutions fast Non-Negotiables * Design quality is paramount: clean, polished, modern UX/UI execution * Bug-fr...

    €8 / hr Average bid
    €8 / hr Gns Bud
    212 bud

    Our MVP is live and stable; the only piece missing before launch is the licensing layer. I already have the logic mapped out for both geographical and categorical tiers, but I need the code that enforces those rules inside Odoo and keeps it in sync with our MEAN-based front end and the existing Python services. Here is what has to happen: • Build or extend an Odoo module that talks to our Node.js API, receives license-creation calls, and stores the resulting keys and usage limits. • Expose secure REST endpoints (or use RPC if you prefer) so the Angular front end can validate a license and retrieve project entitlements in real time. • Make sure the Python micro-services that run our billing routines can both read and write to the same licensing data, preventing race co...

    €932 Average bid
    €932 Gns Bud
    171 bud

    Position: Freelance Smart Contract / Blockchain Engineer Type: Contract / Freelance Location: 100% Remote Workload: Part-time or task-based Compensation: $60–$100/hour (or fixed-price per task) About the Project We are working on DeFi smart contract components, including token implementations and protocol-level logic. Our focus is security, clarity, and real-world usability — not hype. We are building a long-term freelancer pool and looking for engineers who can deliver clean, well-structured Solidity code independently. What You’ll Do Design and implement secure smart contracts using Solidity Work with EVM-compatible chains Review and improve existing smart contract code Follow best practices for documentation, testing, and security Collaborate asynchronously wi...

    €42 / hr Average bid
    €42 / hr Gns Bud
    13 bud

    .NET Developer – Production Support & Evolutionary Maintenance We are looking for a .NET Developer to actively participate in technical support, evolutionary maintenance, and continuous improvement of production systems. This role combines incident resolution, analysis of existing systems, and the development of functional and technical enhancements, working on both standalone solutions and SaaS products used by real clients and operating on platforms with high operational impact. Required Technical Skills - Backend / Microsoft Platform - Strong knowledge of .NET Framework 4.8 or higher, with experience developing, maintaining, and improving applications in production environments - Experience with Entity Framework (Code First and/or Database First), including relationship han...

    €17 / hr Average bid
    €17 / hr Gns Bud
    112 bud

    "Looking for a Chennai - India based Developer" We need an end-to-end system that lets my fitness club run smoothly while giving members a polished mobile experience. On the web side, the software must handle member management, class scheduling, and secure payment processing in one place so staff can sign people up, take bookings, and reconcile transactions without jumping between tools. For members, the native iOS and Android apps should mirror the web database in real time, allowing them to: • track individual workouts and see progress reports that pull from the same records staff view, • reserve or cancel classes instantly, and • follow personalised nutrition plans generated from the back-office portal. Whether you prefer Flutter, React Native, or fully s...

    €276 Average bid
    €276 Gns Bud
    90 bud

    I’m expanding an existing Laravel-based CRM that shares data with our WordPress marketing site, and I’m looking for a developer who can jump straight into feature work written in clean, modern PHP. Here’s what I need tackled first: • User management - Implement role-based access control so permissions can be adjusted from an admin panel. - Add editable profile pages that draw from our current users table without breaking WordPress log-ins. • Sales tracking - Build a visual sales pipeline view (stages drag-and-drop). - Generate performance analytics that show conversion rates and average deal size. - Integrate lead management: capture, assign, and move leads through the pipeline. • Customer support - A lightweight ticket or conver...

    €235 Average bid
    €235 Gns Bud
    90 bud

    I’m building a mobile-only app that needs a real-time text chat backend dedicated to one-on-one conversations. The goal is a lightweight, low-latency server that can authenticate users, deliver messages instantly, store chat history, and scale as the user base grows—all without the overhead of group or public room logic. I’m open to proven stacks such as Node.js with WebSocket/, Go with gRPC, or an equivalent solution that plays nicely with iOS and Android clients. End-to-end encryption, push-notification hooks (FCM / APNs), and a RESTful or GraphQL API for ancillary data are highly desirable. Deliverables • Production-ready server code with clear setup instructions • Secure user authentication and encrypted message transport • Message persistence (Mo...

    €403 Average bid
    €403 Gns Bud
    125 bud

    I’m building a new mobile application and I need a robust Java Spring Boot backend to power it. The core services you’ll create must cover: • User authentication and management with full multi-factor authentication (MFA) and support for future multi-party authentication flows. • A streamlined customer-onboarding journey that begins with registration and ends with a verified, fully profiled user record. • Reliable data storage and retrieval using a relational engine—MySQL or PostgreSQL, whichever you are most comfortable optimising. RESTful APIs should be documented with Swagger/OpenAPI, secured with JWT or a similarly strong token strategy, and thoroughly unit- and integration-tested. I’ll provide the mobile team’s contract-first API s...

    €6 / hr Average bid
    €6 / hr Gns Bud
    30 bud

    I run a Java-based restaurant management application and need it to talk seamlessly to both Swiggy and Zomato so that staff never have to re-enter data in multiple dashboards. The scope is straightforward: connect to each partner API, pull menus, push updates, receive orders instantly, and track every delivery milestone without manual refreshes. Real-time event handling (webhooks or long-polling, whichever the platforms allow) is essential so that kitchen screens and POS reports stay in sync second-by-second. Please deliver: • Menu synchronisation: create, update and deactivate items and modifiers from my app and reflect those changes on Swiggy and Zomato. • Order management: ingest new orders automatically, send accept/cancel actions, print kitchen tickets, and post order stat...

    €85 Average bid
    €85 Gns Bud
    27 bud

    Ich benötige eine schlanke, aber erweiterbare Integration zwischen Shopify und Microsoft Dynamics 365 Business Central. Hauptaufgabe ist es, Produkt- und Bestelldaten in Echtzeit über die Business Central API auszutauschen, ohne zusätzliche Zwischenplattform. Kernanforderungen • Echtzeit-Synchronisation:  – Produkte (Artikelstammdaten, Preise, Bestände)  – Bestellungen inkl. Status-Updates • Technologie: Nutzung der Business Central REST-API als zentrales Gateway; auf Shopify-Seite gern native REST-Endpunkte oder GraphQL, solange die Lösung konsistent bleibt. • Modularer Aufbau, sodass künftige Erweiterungen (z. B. Kundendaten) mit minimalem Aufwand eingebunden werden können. • Sauberes Fehler-Handlin...

    €2143 Average bid
    €2143 Gns Bud
    63 bud

    Most of the core application is already live, but I need a reliable Python/Django developer who can step in quickly and bring the project to the finish line. Here is what I still need: • Add new features that plug smoothly into the current codebase. • Polish and extend existing functionality so workflows feel seamless for end-users. • Track down and fix the lingering bugs we’ve logged. • Refresh selected user-interface screens while keeping the existing design language. • Tweak backend logic where necessary to support the updated UI. The stack is pure Python/Django, so deep familiarity with Django models, views, templates, DRF, and common third-party packages is essential. You should also be comfortable working in Git, writing clear commit messages,...

    €246 Average bid
    €246 Gns Bud
    57 bud

    I need a straightforward Android application that lets my customers send money to me by bank transfer. After signing up or logging in with the classic username-and-password flow, a user should be able to choose an amount, see (or pre-fill) my banking details, and push the payment through an integrated bank-transfer API. Security is critical, so the credential flow must be encrypted end-to-end and the transfer requests signed or otherwise verified to prevent tampering. A lightweight backend—REST or Firebase Cloud Functions is fine—can manage authentication, session tokens, and payment-status webhooks. Please deliver: • Full Android Studio project (Java or Kotlin) • Secure username/password authentication flow • Bank-transfer API integration with success/...

    €110 Average bid
    €110 Gns Bud
    38 bud

    I need a complete Android-based point-of-sale application that can be rebranded for different clients. All source code must be handed over so my team can swap logos, splash screens, and basic colour accents without touching the underlying logic. Core workflow requirements are straightforward: process walk-in sales smoothly, keep real-time inventory counts accurate, store essential customer details for repeat business, and generate clear on-screen and printable bills. The interface should feel classic and simple—think tidy screens, large touch targets, and minimal ornamentation—yet leave room for our logo and a primary brand colour. The build has to expose at least one clean way to push daily summaries to external accounting software (REST, webhook, or a small middleware modul...

    €294 Average bid
    €294 Gns Bud
    23 bud

    Mores What functionality do you want the Telegram bot to have? bot que gestione una base de datos de usuarios y realice peticiones HTTP, Automaticas, API-based integration with external game servers (Unity/JSON). No standard SQL ¿Qué tipo de base de datos te gustaría usar? SQL ¿Qué tipo de peticiones HTTP debe realizar el bot automáticamente? The bot requires standard REST API methods (GET, POST, PUT) to interact, interact with JSON-based endpoints and handle authentication headers.

    €146 Average bid
    €146 Gns Bud
    57 bud

    Project Overview Project Name: School Student Attendance System Goal: Build a system that allows teachers/staff to mark student attendance (possibly with location/time), notifies parents via push notifications when the student is ready for pickup or has been picked up, enables parents to confirm/view status, and handles basic student/parent/teacher data. Architecture: • Mobile App (Teachers / Parents) • Oracle APEX Backend (Admin / Reports / APIs) • Oracle Database Duration: 2 Months (8 Weeks) System Architecture 1) Mobile Application Users: • Teachers → mark attendance and deliver students • Parents → Students receive and students tracking. • Security → deliver students (optional) Features: • Login • Class & student list •...

    €1110 Average bid
    €1110 Gns Bud
    238 bud

    I have a production mobile app built in Flutter that now needs two things at once: a smooth migration to React Native and a fully-featured AI layer. The current codebase performs “average”—solid, but far from the speed, maintainability, and user delight I want to reach. Here’s what I need from you: • First, review the existing Flutter project and outline a clean, low-risk migration path that keeps both iOS and Android parity. • While migrating, weave in a new AI layer that boosts user experience, adds meaningful functionality, and sharpens overall performance. I’m interested in API-based models that support chat-style assistance and data-driven recommendations; prompt design and runtime optimisation will be part of the job. • Once the Reac...

    €8 / hr Average bid
    €8 / hr Gns Bud
    76 bud

    I’m ready to move beyond notebooks and actually ship models, but I’d like to do it the right way, step by step, with an expert by my side. My stack of choice is Python, and we’ll be working on Google Cloud. The part I’m most eager to master is model serving and building production-grade APIs, though I still want you to frame everything in an end-to-end workflow so the pieces fit together. Here’s how I picture our work together: • Pair-programming sessions where we containerise a trained model, push it to Google Cloud (e.g., Cloud Run or Vertex AI), and expose it through a REST or gRPC endpoint. • Walk-through of best practices for versioning, environment management, and automated CI/CD so each new model can be rolled out with minimal friction. ...

    €18 / hr Average bid
    €18 / hr Gns Bud
    102 bud
    Restaurant and Retail POS
    3 dage left
    Godkendt

    I’m looking for an experienced developer/team to build a complete offline-first POS platform that runs reliably on a local network (LAN). The system must keep working when the internet is down, but also support optional online features for some customers (e.g., cloud reporting, multi-site reporting, remote backups, and online ordering integrations). In short: offline by default, online when needed. Two product modes in one codebase A) Hospitality (Restaurant / Bar) Windows POS touchscreen: tables & floorplan, open tickets, split/merge/move, void/refund, discounts, VAT/tax rules Android handheld ordering (PWA or native): fast ordering per table, live sync with POS + KDS, offline queue + retry KDS (Kitchen Display System): new → preparing → ready, station routing (kit...

    €8013 Average bid
    NDA
    €8013 Gns Bud
    153 bud

    أرغب في تنفيذ تطبيق ‎iOS‎ تعليمي يعمل بكفاءة كاملة سواء كان الجهاز متصلاً بالإنترنت أو لا. أحتاج إلى شريك تقني يقود المشروع من الصفر: هندسة البنية الخلفية، تصميم ‎UI/UX‎، البرمجة، ثم الاختبار والتسليم النهائي مع الكود المصدري. التطبيق يجب أن يدعم العربية والإنجليزية، ويُصمَّم وفق مبدأ ‎offline-first‎ مع مزامنة فورية حال توفر الشبكة ليظل صالحاً للمستخدمين في المناطق منخفضة الاتصال. أتطلع إلى بنية قوية قابلة للتوسّع تخدم ملايين المستخدمين مستقبلاً، مع إمكان إضافة منصّات أخرى (Android والويب) لاحقاً دون إعادة كتابة جوهر النظام. التجربة التعليمية ينبغي أن تتضمن وسائط متعددة، اختبارات تفاعلية، تتبّع تقدّم، وإشعارات ذكيّة تعيد المستخدم إلى المحتوى المناسب. أفضل اعتماد تقنيات حديثة مثل SwiftUI على الواجهة وCore Data/Realm لطبقة التخزين، مع واجهة إدارة مبنية على ‎REST&...

    €198 Average bid
    €198 Gns Bud
    16 bud

    I need a full-stack developer who can turn a straightforward informational concept into a polished, responsive web application. The site will be open to the general public for browsing, while registered users will enjoy additional authenticated features. You are free to choose between a Python (Flask) or Node.js backend, but please keep MongoDB as the data store. On the front end, I expect clean, semantic HTML, modern CSS for a crisp UI, and JavaScript to keep interactions smooth. The back end should expose well-structured RESTful routes that handle basic authentication along with standard CRUD actions. Whether you pick Flask with Jinja templates or a Node/Express stack with a preferred view layer, the code must remain clear, modular, and fully documented so another developer can step in ...

    €451 Average bid
    €451 Gns Bud
    72 bud

    Android CameraX & API Integration (We have 80% of the code logic ready - No R&D needed) We are looking for an experienced Android Developer to build a technical prototype (MVP) focused on real-time image processing for a Huawei P10 device. IMPORTANT: We are not reinventing the wheel. We have already completed the research phase. We will provide you with: 1. The Official SDKs and Documentation needed for the project. 2. Reference Code (80% of the logic): We have identified specific open-source samples (Google Samples) that already handle the image capture and API request logic. Your job is NOT research. Your job is to assemble these existing pieces into a stable background service and optimize it for the target device. Project Scope: Create a lightweight Android application that r...

    €138 Average bid
    €138 Gns Bud
    57 bud

    We are looking for an experienced Microsoft 365 specialist to design and implement an automated SharePoint-based data room template using SharePoint Online and Power Automate. The objective is to create secure, repeatable “virtual data room” environments with structured document indexing, automated numbering, audit logging, permission controls, and administrative workflows. All in a manner that can be managed by the internal IT team post implementation. Please note that some manually created data rooms are already in place and we would ideally want this work to improve on what has already been done. Scope of Work: 1. SharePoint Data Room Configuration • Build and configure SharePoint Online sites to function as secure data rooms based on existing data room sites. • ...

    €2619 Average bid
    €2619 Gns Bud
    30 bud

    Emails hit our dedicated sales inbox every day and I want them turned into ready-to-use quotes inside MYOB Advanced (Acumatica) without re-typing a single line. From each message—whether it arrives as simple text or rich HTML—the interface must reliably read the email and interpret the content mapping it to data such as item detail, customer information contained within MYOB. Once those fields are captured, the tool should offer two modes. In automatic mode it calls the MYOB Advanced API and creates the quote immediately. In review mode it presents the parsed data in a clean pane or file so a user can double-check, adjust if needed, and then push the same “create” call manually. A setting or flag that toggles between the two behaviours will be fine. I already have...

    €36 / hr Average bid
    NDA
    €36 / hr Gns Bud
    69 bud

    The project revolves around expanding and maintaining a WooCommerce-based multi-vendor marketplace over an extended period. Our Offer 1. You must fully customise our theme. 2. You will receive a $75 aud. 3. You will receive $X Fee from every new sale for the 3 years 4. You must Manage and Maintain the site 24/7 X365 days 5. You must guarantee UNLIMITED REVISIONS for your work. 6. Some coding required. Primary scope I need the multi-vendor layer built and refined, starting with a solid vendor dashboard that lets sellers manage products, view orders, and track basic analytics without ever touching the WordPress back-end. Clean UI/UX, mobile-responsive design, and role-based access are essential. Day-to-day work will include: • Selecting, c...

    €6 Average bid
    €6
    26 indlæg

    Most of the core application is already live, but I need a reliable Python/Django developer who can step in quickly and bring the project to the finish line. Here is what I still need: • Add new features that plug smoothly into the current codebase. • Polish and extend existing functionality so workflows feel seamless for end-users. • Track down and fix the lingering bugs we’ve logged. • Refresh selected user-interface screens while keeping the existing design language. • Tweak backend logic where necessary to support the updated UI. The stack is pure Python/Django, so deep familiarity with Django models, views, templates, DRF, and common third-party packages is essential. You should also be comfortable working in Git, writing clear commit messages,...

    €263 Average bid
    €263 Gns Bud
    52 bud

    I’m putting together a clean, developer-ready set of API docs for two IPTV panels—XtreamUI and NXT Dash—and I still need reliable, up-to-date material. XUI is already covered on my side, so please focus only on the panels named above and feel free to add any other panel you already have solid references for. What I expect to receive for each panel: • Authentication flow explained step-by-step, including tokens, cookies or keys used • At least one working example request and the full JSON/XML response for the key calls (user login, playlist retrieval, stats, etc.) PDF, Markdown or a Postman/Insomnia collection is fine; clarity is what matters most. I’ll verify by importing your examples and running them against a test server, so the samples need to be com...

    €108 Average bid
    €108 Gns Bud
    57 bud

    Overview: We’re looking for an experienced SuiteCRM developer/designer to help us customise a new SuiteCRM 8.9 installation for our sales team. The goal is to create a modern, user-friendly CRM interface that matches our visual designs and delivers a smooth, efficient experience similar to and Zoho CRM. Key Objectives: • Install SuiteCRM 8.9 on our web server (latest version). • Build a custom SuiteCRM theme (no prebuilt themes) to match our provided designs. • Streamline the sales process: intuitive in-line edits, pop-up windows, quick lead management that matches the visual styling of and Zoho CRM. • Develop and refine multiple modules • Integrate with Google Calendar (2-way), email sync, and lead enrichment APIs (, Apollo, , etc.). • Implement dupl...

    €263 Average bid
    €263 Gns Bud
    36 bud

    Full Time position E-commerce Company US Tampa HQ Remote Responsibilities: Odoo 18 Development: Architect and develop custom modules, themes, and features specifically for the Odoo 18 environment. Web & Portal Optimization: Design and implement responsive, user-friendly web pages and portals using OWL, QWeb, and SCSS. System Integration: Build and maintain REST APIs to connect Odoo with third-party logistics, payment gateways, and marketing tools. Performance Tuning: Optimize database queries (PostgreSQL) and front-end performance to ensure high-speed user interactions. Technical Leadership: Lead version upgrades, refactor legacy code, and establish best practices for version control using Git. Technical & Qualifications: 5+ years of professional experience in Odoo development ...

    €11 / hr Average bid
    €11 / hr Gns Bud
    67 bud

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