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Summary Senior Backend Developer Needed — Dog Marketplace App (NestJS + Flutter Integration) We are building Doggy, a dog walking/sitting marketplace app for Israel. The Flutter app UI is already ~70% complete (~54 screens already built). We need an experienced backend developer/team to build the full production backend, integrate the Flutter app with live APIs, and build a small React admin panel. Scope Backend Build a production-grade backend including: • Auth & OTP • JWT sessions • User/walker profiles • Booking engine + state machine • Payments & payouts (Tranzila) • Real-time chat • Notifications • Reviews • Reports/disputes • Live tracking (MVP) • Admin moderation tools Flutter Integration You are NOT building new Flutter UI screens. A separate frontend developer handles UI. You ARE responsible for: • integrating all screens with APIs • replacing mock/demo data • loading/error states • [login to view URL] + FCM integration • coordinating with frontend dev Admin Panel Build a simple 3-screen React admin panel: • Walker verification • User/walker management • Reports & disputes queue ⸻ Tech Stack • Node.js • NestJS • TypeScript • PostgreSQL + PostGIS • Prisma • Redis • BullMQ • [login to view URL] • React • Firebase • Cloudflare • Tranzila ⸻ Project Details • Fixed price: ~$4,400 • Timeline: 8–9 weeks • Potential long-term work after MVP launch ⸻ Requirements Must have experience with: • NestJS • PostgreSQL • production backend systems • Flutter integration • payments • real-time systems Big advantage: • marketplace apps • Tranzila • Israeli market/payment systems ⸻ To Apply Send: 1. Relevant projects 2. NestJS/Postgres experience 3. Flutter integration experience 4. Availability 5. Solo or agency Full BRD/TSD documents will be shared with shortlisted candidates.
Project ID: 40443830
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158 freelancers are bidding on average $3,922 USD for this job

With over a decade of experience in full-stack architecture and high-scale systems, I understand your need for a senior backend developer to build the production backend for your Doggy dog walking/sitting marketplace app in Israel. My background in delivering high-performance solutions for complex systems, such as serving over 1 million users and implementing high-security FinTech solutions, directly applies to the challenges of integrating the Flutter app with live APIs and building the necessary backend features. One strategic insight for ensuring scalability and security is to implement JWT sessions for seamless authentication and to use Redis for efficient caching. I have successfully integrated Flutter apps with APIs and have experience with NestJS, PostgreSQL, and real-time systems, making me well-equipped to take on this project. I encourage you to reach out to discuss how we can collaborate to bring your vision to life. Let's connect to discuss the roadmap for your Doggy platform and how I can contribute to its success.
$4,000 USD in 45 days
7.7
7.7

Hi, this dog-walking marketplace backend project presents an interesting challenge in orchestrating real-time interactions and payment flows with a partially completed Flutter frontend. The real engineering risk lies in orchestrating reliable real-time booking state transitions and live tracking updates while maintaining session integrity and payment security. I usually structure backend systems with clear separation between authentication, transactional booking logic, and real-time event handling to isolate concerns and improve maintainability. The Custom Feature Development & Integration project reflects my experience in integrating backend APIs with frontend clients and delivering production-ready features while maintaining code quality. I recommend separating the booking engine state machine from notification and chat subsystems to allow independent scaling and fault isolation. Though this project does not focus on LLMs, my approach always includes thorough validation and fallback mechanisms to ensure system reliability under load. Systems designed for long-term production use require clean API contracts and robust error handling to support ongoing feature additions and maintenance. I can start by outlining the booking and real-time tracking pipeline and mapping the agent flow for Flutter integration. Thanks, Hercules
$5,000 USD in 20 days
6.7
6.7

Hi there, We’ve built several successful marketplace apps, including a dog-walking platform similar to your concept. We understand the importance of a robust backend and have extensive experience with NestJS, integrating it with Flutter and React, and managing CI/CD pipelines. As a team of dedicated developers, we can assign specialists for each task—backend, frontend, mobile, and DevOps—ensuring you get expert-level work at a cost-effective price. We also offer a fully developed, production-ready solution called Descripio, which uses AI to optimize Amazon product listings. This product demonstrates our ability to deliver high-quality, scalable solutions. Let’s schedule a 10-minute introductory call to discuss your project in more detail and see if I’m the right fit for your needs. Best, Adil
$4,323 USD in 21 days
6.7
6.7

I am a seasoned backend developer with extensive experience in building production-grade systems, particularly using NestJS, PostgreSQL, and integrating with front-end applications such as Flutter. My skill set aligns closely with your needs for building the Doggy app backend, as I have successfully managed similar projects that required intricate API integration, real-time system development, and secure payment processing. My past projects include developing marketplace platforms and implementing comprehensive auth, booking engines, and chat functionalities. This experience is complemented by my proficiency with Tranzila and real-time notification systems using Socket.IO. Additionally, I've built admin panels using React, focusing on effective user management and data handling, which meet your project requirements. I am keen to bring my expertise to the Doggy project and am available to commence work immediately. Could you provide more specifics about your transition from MVP to long-term objectives? I'm prepared to discuss any further details or questions you might have.
$4,800 USD in 30 days
6.7
6.7

Hello! As per your project post, you’re looking to build a backend and platform infrastructure for Doggy, a dog walking and sitting marketplace app for Israel. With the Flutter UI already largely completed, the goal is to create a scalable backend ecosystem that powers real time bookings, payments, chat, tracking, moderation, and marketplace operations while seamlessly integrating with the existing mobile application. My focus will be on delivering a complete marketplace backend solution, featuring: NestJS based production backend architecture, secure authentication with OTP and JWT sessions, user and walker profile management, booking engine with state machine workflows, Tranzila payment and payout integration, real time chat and notifications, reviews and dispute management, live location tracking. I specialize in building scalable marketplace and real time service platforms using NestJS, Node.js, Flutter, React, PostgreSQL, Firebase, WebSocket technologies, and cloud based backend systems with expertise in booking workflows, payment systems, live tracking, chat infrastructure, role based permissions, and enterprise SaaS architecture. Let’s connect to review the existing Flutter codebase, API architecture, booking workflows, and MVP launch priorities so we can finalize the backend roadmap and deployment strategy. Best regards, Nikita Gupta.
$3,000 USD in 45 days
6.5
6.5

Hello! I am a Florida-based senior software engineer with extensive experience in full-stack development, including the technologies you mentioned for your dog marketplace app. I've carefully read your project description and I'm excited about the opportunity to contribute. I have over 15 years of experience in developing production-grade software and have a proven track record with NoSQL, Node.js, PostgreSQL, and Flutter integrations. My approach combines technical expertise with a focus on practical solutions that drive ROI. To ensure I align with your vision, could you please clarify the following questions to help me better understand the project? 1. What specific features do you envision for the dog-walker platform that would set it apart from competitors? 2. Are there any third-party services or APIs you plan to integrate, and if so, what are they? I suggest starting with a detailed requirements analysis, followed by an agile development phase with regular updates to ensure alignment. I’m committed to delivering high-quality results that meet your expectations. Looking forward to your response! -James
$4,500 USD in 14 days
5.5
5.5

Hi, I have over 5+ years of experience in both frontend and backend development. I will do the specified tasks. Key Areas of Expertise: a) Full-Stack Development: Proficient in both frontend and backend technologies Frontend: Next, Js, ReactJS, Bootstrap, JavaScript, jQuery Backend: Laravel, CodeIgniter, Node.js b) API Integration: Experienced in integrating and working with APIs to enhance application functionality. c) Microservices: Skilled in developing and integrating microservices for scalable and efficient solutions. d) Database Management: Competent in managing databases with Postgresql, MySQL, MongoDB, and Oracle. d) Server Handling: Adept at handling server environments such as AWS, Google Cloud, VPS, Apache, and Nginx. Let’s discuss how I can help achieve your project goals and add value. Lets connect in chat so that We discuss further. With Regards, Sai
$3,000 USD in 45 days
5.2
5.2

I can architect and build the backend for your full-stack dog-walker marketplace, ensuring a clean NestJS API that integrates smoothly with your Flutter app. I’m comfortable owning the backend from design to deployment so your mobile experience feels fast, reliable, and secure. I’ve led similar marketplace builds involving user roles (owners/walkers), bookings, payments, reviews, and real-time features like availability and notifications, all exposed via well-documented REST/GraphQL APIs. I’d start by clarifying core flows, design the data model and auth, then implement modular NestJS services and endpoints optimized for Flutter, with proper testing and CI/CD. Do you already have your Flutter architecture and API spec defined, or should I help shape that as well?
$4,000 USD in 7 days
4.7
4.7

Hello, I am Vishal Maharaj, with 20 years of expertise in PostgreSQL, React.js, Full Stack Development, Flutter, API Development, API Integration, Node.js, NoSQL Couch & Mongo. I have carefully reviewed the requirements for the Full-Stack Dog-Walker Platform Build project. I propose to build a robust production backend with essential features such as authentication, user profiles, booking engine, payments, real-time chat, notifications, and more. Additionally, I will seamlessly integrate the Flutter app with live APIs, ensuring smooth functionality without building new UI screens. The React admin panel will be developed to manage walker verification, user/walker profiles, and reports/disputes efficiently. I am ready to discuss the project details further and provide a comprehensive solution. Please initiate a chat to explore this opportunity. Cheers, Vishal Maharaj
$3,000 USD in 20 days
5.3
5.3

Hey there I've reviewed your project details and I'll build the full backend with NestJS including auth with OTP and JWT sessions, set up the booking engine with state machine, connect payments through Tranzila, and build the simple React admin panel for walker verification and disputes. I also work 4x faster using AI tools like Claude Code, so you'll get good results in less time. I do have a couple of quick questions to make sure I'm on the right track. I'd love to discuss this further — feel free to message me anytime and we can get things moving! Thanks,
$3,000 USD in 30 days
4.1
4.1

Hello, I understand the importance of finding a skilled backend developer to bring Doggy, the dog walking/sitting marketplace app for Israel, to life. With a strong background in Node.js, NestJS, PostgreSQL, and real-time systems, I am confident in my ability to tackle the challenges outlined in your project description. My approach would involve meticulously building the production-grade backend, seamlessly integrating the Flutter app with live APIs, and developing a user-friendly React admin panel. By focusing on key features such as user/walker profiles, booking engine, payments, real-time chat, and admin moderation tools, I aim to deliver a robust platform that meets your requirements. Having successfully worked on similar projects in the past, I am well-equipped to handle the complexities involved in this endeavor. I look forward to the opportunity to collaborate and contribute to the success of Doggy. Best regards, Jayabrata Bhaduri
$4,000 USD in 7 days
3.8
3.8

Building a dog-walker platform sounds like a fun challenge. I noticed you’re looking for a backend developer familiar with NestJS and Flutter, which aligns well with my experience. Your goal to create a marketplace app for dog services is clear, and I can help streamline the API integration with the tech stack you've mentioned. With nearly 10 years of experience in full-stack development, I've worked on various projects, including cloud-based applications and platforms that integrate different services. Some similar things I've built: a regional booking platform for a tutoring company, an internal CRM for a property agency, and a React Native field-reporting app. I understand the importance of building a reliable and user-friendly platform. Let’s discuss how I can help you achieve this. Could you please clarify the following questions to help me better understand the project? Q1: What specific features do you envision for the dog-walker marketplace? Q2: Are there any particular challenges with API integration you anticipate? Q3: How do you plan to handle user data and security on the platform?
$4,500 USD in 26 days
3.7
3.7

Hello, I understand you need a Senior Backend Developer to build the production backend for your dog walking/sitting marketplace app, Doggy, integrate it with the existing Flutter app, and create a React admin panel. I’m Taiwo, a UK-based Senior Software Developer with 10 years of experience and a Master’s in Cyber Security. I have experience building backend systems for top companies like IBM, UK Government, BMW, and Sky. I am confident in building secure, reliable, and scalable applications. I can build the NestJS backend with PostgreSQL, integrating all screens with APIs, implementing real-time chat, payments (Tranzila), notifications, and building the React admin panel. I have extensive experience with NestJS and PostgreSQL, as demonstrated in projects like Equity Share and IMS Team. My experience with AWS and Azure would allow to quickly deploy the application to the cloud. Relevant experience: ⏺ IMS Team – project management and timesheet system (PostgreSQL backend) ⏺ Equity Share – backend for a US real estate crowdfunding platform with a focus on secure, scalable application logic. I’m available to start immediately and confident I can deliver a high-quality product within the specified timeline. I am familiar with Agile methodology and project management. Please let me know when you’re available to discuss the project requirements in more detail.
$4,000 USD in 41 days
3.5
3.5

Hello, I hope you are doing well. I understand that you are looking to build a DOG WALKER MARKETPLACE, and I would be happy to help. I have extensive experience in designing and developing marketplaces and have successfully delivered many projects. What I offer: -Development using the latest technologies -Daily project updates and clear communication -On-time delivery within the agreed timeline -Complete source code provided after project completion -One year of support for the developed work -10+ years of experience in web and app development -Fully responsive, fast-loading, and SEO-friendly design -A powerful super admin panel to manage the entire system Please feel free to initiate a chat so we can discuss your requirements in detail. Thank you and regards, Dheeraj K.
$3,000 USD in 25 days
4.3
4.3

Hi, This is Abhiram from UK. I understand the challenge of developing a production-grade backend for the Doggy dog walking/sitting marketplace app. With experience in NestJS and backend systems, I can efficiently handle the integration with live APIs and build the necessary features like auth, booking engine, and real-time chat. Let me ask you a couple of things so I understand it better: Q1- Do you have specific requirements for the real-time chat feature? Q2- How do you envision the user/walker profiles to be structured for optimal user experience? Looking forward to discussing the project details further.
$3,800 USD in 16 days
0.0
0.0

As a seasoned Full-Stack Engineer fluent in NestJS, PostgreSQL, and the frontend trifecta of React, Flutter, and Node.js, I am confident that I am your best possible fit for this important Doggy project. My extensive experience with marketplace apps and my deep understanding of real-time systems make me uniquely poised to seamlessly integrate the already completed Flutter UI with your back end needs. Whether it is handling user/walker profiles, implementing a booking engine and state machine or ensuring secure payments via Tranzila, my past experiences meld perfectly with this job's requirements. Finally, as someone who owns their tasks from inception to maintenance & enhancements, I assure you of giving your project the attention to detail it deserves while keeping an eye on its long-term goals. With my dedication and strong problem-solving skills, I'm confident in being able to deliver efficient code that's manageable and scalable – something pivotal for a project as large-scope as Doggy. Choosing me for this project means getting someone who has not only juggled similar responsibilities before but also values the real-world utility of her work.
$4,000 USD in 7 days
0.0
0.0

As an accomplished full-stack Web Developer, I bring a diverse skill set and extensive experience to your Doggy project. Throughout my career, I've specialized in several JavaScript-based technologies that can synthesize well for a complex project like yours. On the front end, I've worked with powerful frameworks such as React and have a deep understanding of UI/UX principles for simultaneously creating seamless user experiences and visually engaging designs. This holds true also on the backend where I develop scalable and efficient server-side applications using frameworks like Express.js. Finally, to note my compatibility with your project's unique demands, I have proven competence in working on marketplace applications of similar nature, alongside payment processors like Tranzila. The fact that I am conversant with the Israeli market/payment systems is an added advantage that will contribute positively to cumplish the highest level of professionalism that your project deserves. Start our partnership today based on clear communication, adherence to deadlines and reliable solutions as we work towards the successful launch of your MVP!
$4,000 USD in 7 days
0.0
0.0

I'm Jonathan, a seasoned full-stack developer well-versed in Node.js, PostgreSQL and React.js, which makes me a strong fit for building the back-end of your dog-walking marketplace app. I have hands-on experience with production-grade backend systems—it encompasses much of what your project calls for. And, thanks to my proficiency in Flutter integration, I can ensure seamless coordination between the API and UI to deliver a smooth user experience. What sets me apart from others is not just my technical expertise but also an understanding of how technology directly impacts business outcomes. I don't simply build websites; I build high-performing platforms designed to deliver tangible results. With your project, I will leverage my proven skills in data analysis to help you make informed decisions that boost your platform's efficiency and profitability. Moreover, I've worked on similar marketplace applications before, making me well-versed in the complexities involved in managing users and processing payments securely. This combined with my past experience working on real-time chat and notification features positions me as an excellent choice for delivering all aspects of your project on-time and to the highest standard.
$4,000 USD in 7 days
0.0
0.0

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