Complete Development of a Fully Functional App

@infowider11

Hi, I’m a perfect fit for this project and can take your existing app code to a fully functional, production\-ready release\. I’ll complete the remaining features, integrate required third\-party APIs/apps, subscription billing, user profiles and related backend functionality\. I’ll also review the existing codebase, fix issues, improve stability and ensure all integrations work smoothly across the app\. You’ll receive a tested, maintainable build with the existing code preserved and ready for deployment\. Let’s Chat… Thanks

@eclairios

Hello, I understand you're looking for an experienced freelancer to complete the development of your app, integrating features like app-to-app communication, subscription services, and robust user profiles. My expertise in scalable app development and API integration makes me well-suited to bring your existing codebase to full functionality. I’m Waqas from Eclairios, a professional software engineer with over 7 years of experience in app and web development. I have successfully completed 128 projects, earning a 5.0 rating from satisfied clients. I specialize in mobile apps (Android, iOS, Flutter), website development, custom APIs, and backend solutions. My goal is to deliver high-quality, scalable solutions that meet your business needs. Why hire me? ★ 100+ Projects Completed with 5-star rating. ★ 3 months of free post-launch support ★ Expertise in advanced technologies and systems Let’s connect and discuss how I can help you with your project. Best regards, Waqas

@ZohaibRoy

⭐⭐⭐⭐⭐ Complete Your App Development with Expert Integration and Features ❇️ Hi My Friend, I hope you're doing well. I've reviewed your project requirements and see you're looking for someone to complete your app development. You have no need to look any further as Zohaib is here to help you! My team has successfully completed 50+ similar projects in app development. I will ensure your app is fully functional with all necessary features, including integration with other apps, subscription services, and user profiles. ➡️ Why Me? I can easily complete your app development as I have 5 years of experience in app development, API integration, and subscription-based models. My expertise includes coding, debugging, and user interface design. Additionally, I have a strong grip on mobile development frameworks and back-end technologies, ensuring a seamless experience for your users. ➡️ Let's have a quick chat to discuss your project in detail and let me show you samples of my previous work. I'm looking forward to discussing this with you in our chat. ➡️ Skills & Experience: ✅ App Development ✅ API Integration ✅ Subscription Services ✅ User Profile Management ✅ User Interface Design ✅ Mobile Development ✅ Debugging ✅ Database Management ✅ Cross-Platform Development ✅ Version Control ✅ Testing & Quality Assurance ✅ Agile Methodologies Waiting for your response! Best Regards, Zohaib

@ahmadayaz

As an experienced app developer, I understand the importance of ensuring functionality and enhancing features in your app. I specialize in API integration and subscription models, aiming to deliver a seamless user experience. To proceed, I need more details on the existing codebase, required integrations, subscription services, and user profile management challenges faced. Additionally, discussing your long-term vision for the app and potential future features would be beneficial. I am confident in delivering exceptional results and establishing a long-term partnership to support your app's growth and success. Let's collaborate to bring your app to its full potential.

@vladang

Existing code makes subscription state and API failure handling the biggest handoff risks. I’d first audit the current iPhone/Android codebase, map what’s complete, and identify broken or missing connection points. Then I’d finish the app integrations, user profiles, and subscription flow while preserving the existing architecture. Subscription entitlements should be verified against StoreKit/Google Play billing data, not trusted only from the device. Which parts currently work, and can you share the codebase plus the list of apps or APIs that still need integration?

@pinkeegupta

Hello On which technology your existing app and backend is done? Please message me so that we will have detail technical discussion. I have 9+ years of combined experience in Mobile Application development, Website development, Desktop application development, 3rd party Artificial Intelligence api, AR/ VR, Chatbot, Blockchain- Cryptocurrency, CRM & ERP, Game Development and any other Software development. I am having expertise in Native on Android Java, kotlin and IOS Swift, and For Hybrid Cross platform on Flutter Dart & React- Native and for web and backend on react js and node js, Python Django. Please consider me and initiate a chat for further detailed discussion. Regards, Anju

@ciss26

Hi there, Hope you are doing well I’d love to help complete and transform your existing app code into a fully functional, production-ready application. we have strong experience with mobile app development, API integrations, subscription systems, user profiles, and third-party services. Key Features Complete existing codebase review and development User registration, login and profile management API and third-party app integrations Subscription plans and recurring payments Subscription status and billing management Secure user authentication Push notifications Data synchronization and backend integration Error handling and performance optimization Admin functionality, if required Testing, bug fixing and deployment App Store and Google Play release support Recommended Tech Stack Mobile: Flutter Backend: Node.js + NestJS Database: PostgreSQL / MySQL Authentication: Firebase Auth / JWT Thanks & Regards Dheeraj K.

@mahig47

Hello, I have experience taking over existing mobile applications, understanding the current codebase, fixing incomplete functionality, and completing production-ready features without unnecessarily rebuilding what is already working. I can review your existing source code, identify the current architecture and pending work, and then complete the app with the required third-party app integrations, API connections, subscription/billing functionality, user profiles, authentication, and related workflows. I’ll first audit the existing implementation so we can clearly separate what is already functional from what needs to be completed or improved. I’ll also ensure the integrations are handled securely, subscription states are synchronized correctly, and the final application is tested across the required devices/platforms before delivery. PLEASE INITIATE CHAT SO I CAN REVIEW YOUR EXISTING CODEBASE AND SHARE RELEVANT APP DEVELOPMENT PROJECTS. Best Regards, Nikita Gupta

@HamparProd

Hi, I can take over the existing codebase and complete the app without rebuilding stable functionality unnecessarily. My first step would be a structured audit of the current iOS/Android project: architecture, unfinished screens, authentication, user profiles, API integrations, subscription flow, data persistence, crash/error handling, and current build status. From there I’ll create a completion plan and work feature-by-feature, including third-party app/API integrations, subscription purchase/renewal handling, profile management, and any missing backend connections. I’ll also test the important user journeys end-to-end, clean up unstable code, improve error handling, and make sure the final builds are ready for App Store and Google Play testing/submission. I’m comfortable inheriting existing mobile applications and working within the current architecture where it makes sense rather than forcing a rewrite. Delivery includes completed source code, build instructions, integration notes, QA fixes, and release-ready builds.

@ahsansaleemnaz

Hi, I’d start with a technical audit of the existing codebase to identify what can be reused and where the gaps are before implementing new features. That approach reduces rework and ensures integrations, subscriptions, and user profiles are built on a stable foundation rather than patched onto incomplete code. I’ve delivered enterprise SaaS platforms with secure authentication, subscription workflows, third-party API integrations, and scalable backend architectures using ASP.NET Core, React, and cloud technologies. Let’s talk over chat and discuss it over a call.

@sharjeelrb

Hello, I can complete your existing app using the current codebase, including third-party app integrations, API integrations, user profiles, and subscription services. I’ll focus on making the existing features fully functional, stable, and production-ready while keeping the code clean and maintainable. I have experience with mobile app development, REST APIs, authentication, and subscription systems, and I’m available to start immediately.

@ank26oct

As a seasoned full-stack mobile and web developer, I'm well-versed in all the technologies and frameworks necessary for your project's completion. With experience and proficiency utilizing Flutter, React Native, Kotlin, Node.js and NestJS, among others, I can efficiently work with your existing code to ensure the smooth integration of other apps, subscription services and user profiles. Having built real-time apps, e-commerce platforms and Saas dashboards to name just a few, I'm extremely comfortable executing precisely the kind of functionality you need. What separates me from the rest? My commitment to modular, future-proof designs ensures clean, scalable code for every app component and a resilient architecture that won't buckle under pressure. Furthermore, as evidenced by my prompt response time here and my track record in consistently on-time delivery, you can expect full ownership of this project without any outsourcing delays. My support is also assured long after we've shipped the app. Let's collaborate to turn your app dream into reality

@mayr81

With over X years of experience in the field of software development and an expertise in mobile app development, I am confident that I am a great fit for your project. My skill set includes Android, iPhone, Mobile App Development, Objective C and Software Architecture - all key components required for the successful completion of your app. What sets me apart is my ability to seamlessly integrate different applications, which is exactly what you have in mind for your project. My previous work experience with API integration aligns perfectly with this project requirement. Additionally, my experience with subscription-based models will ensure a smooth running of this aspect of your app. In terms of project management and workflow, my clients have always appreciated my clear and professional communication, fast turnaround time and organizational skills. I understand how crucial it is for an app to be fully functional from the get-go - it affects not just user satisfaction but also business processes. Hence, I will bring all my skills and expertise to bear on your project to ensure that we achieve the desired results within the agreed timeframe. In me you'll find a reliable, detail-oriented partner who will provide long-term support even after project completion.

@demivision

Hi there, Employer, Thank you for sharing the details of your app development project. I understand that you’re seeking an experienced developer to complete your app using existing code, ensuring it is fully functional with features like app integrations, subscription services, and user profiles. With several years of expertise in mobile app development for both iOS and Android platforms, I am well-versed in Objective-C and robust software architecture. I have successfully delivered multiple projects that required seamless API integration and the implementation of subscription-based models, ensuring secure user authentication and smooth payment flows. My experience also extends to integrating third-party services and creating intuitive user profile management systems, which are crucial for user retention and satisfaction. My approach would begin with a thorough review of your existing codebase to identify any gaps or opportunities for optimization. From there, I will collaborate closely with you to finalize feature requirements, focusing on integrating external apps, establishing reliable subscription services, and refining user profile functionalities. Throughout the process, I will ensure the app meets industry standards for performance, security, and usability. I am committed to transparent communication and delivering a solution that aligns with your vision. Please feel free to share more details about your current code and specific app goals, so we can work together to bring your project to its full potential. Looking forward to the opportunity to collaborate with you. Best regards, DemiVision, LLC

@eliaa

Hi, I see you need to complete the development of an app using existing code, which often involves understanding and integrating legacy code without creating conflicts. The hidden challenge is ensuring the existing backend logic aligns with new features without breaking current functionality, and with over 10 years in Laravel and Native PHP backend development, Smart Sols is well-equipped to manage that smooth integration. Have you identified any specific modules in the current app that need refactoring before adding new features? Let’s discuss how we can finalize your app efficiently.

@AndrewJSMAN

I've built subscription-driven apps with in-app purchase flows and third-party API integrations before, so this is right in my wheelhouse. I'll audit the existing codebase first, then implement the missing subscription layer using StoreKit (iOS) and BillingClient (Android), patch any API endpoints for multi-service integration, and stabilize user profile persistence with CoreData/Room. I'll validate all flows—purchases, profile updates, background sync—on staging before pushing to production to avoid failed payments or broken sessions. I can start immediately. Thanks, Andrii

@XRProConnect

Hi, Aashiq (Ash) here from Cape Town, South Africa. This project instantly caught my eye, so I had to reach out. I see you’re looking for someone to complete the development of your app, focusing on features like integration with other apps and subscription services. That’s right up my alley! I’ve helped businesses enhance user engagement and streamline their operations through app development and API integration. My experience includes creating seamless user profiles and subscription-based models, and I’d be happy to share samples of successful projects I’ve completed. Based on what you mentioned, here is how we would approach the project: - Review the existing code for quality and functionality - Integrate necessary APIs and subscription services - Ensure a smooth user experience with intuitive profiles You can count on clear communication throughout the process, delivering a seamless, integrated, user-focused solution optimized for performance. Best Regards, Aashiq

@jonasdedzo

Hi there, I understand your goal is to complete your existing app rather than rebuild it. My approach is to review the current codebase first, verify the existing architecture, then complete the remaining features including API integrations, subscription flow, user profiles, and testing. I'll focus on clean, maintainable code while ensuring every feature works reliably and integrates smoothly with your current implementation. I think you're trying to bring an unfinished app to a production-ready state with as little disruption as possible. I hope to understand what's already completed before implementing the remaining functionality. Is the full source code available? Which subscription provider are you using, and are the APIs already connected or still pending? Knowing the current status will help define the most efficient implementation path. Budget: USD 800 Timeline: 10 Days M1: Codebase review, architecture validation, implementation plan, and core feature completion - USD 250 M2: API integrations, subscription services, and user profile functionality - USD 350 M3: Final testing, bug fixes, optimization, and deployment-ready delivery - USD 200 Looking forward to work with you. Thanks. Thanks.

@melopgabriel

Hi, your app is already built in part, and the main need now is finishing it so the core features work smoothly end to end. I can step into existing code, trace what’s already there, and complete the missing pieces without disrupting the current structure. I’ve worked on app builds that needed API integration, user profiles, and subscription flows, so I know where these projects usually break: auth, billing setup, and data syncing between services. My approach would be to review the codebase first, identify gaps, then implement the integrations and polish the subscription and profile logic until everything is stable and testable. I focus on clean fixes, clear communication, and making sure the app is ready for real use. If you’d like, I can help bring it across the finish line. Best regards, Gabriel