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I run a live production app that combines a .NET 8 microservice back-end with a React Native front end, hosted on Ubuntu servers in AWS. Right now the most urgent need is to deliver new functionality, and nearly all of that work sits squarely on the back end. Your first assignments will centre on extending our microservice architecture and exposing new, well-documented APIs. You’ll be writing C#, containerising services, wiring events through RabbitMQ, and persisting data in PostgreSQL—then shipping the code straight into production. I pay $6/hour for hands-on development only; time spent reading code, researching, or experimenting is on the freelancer. Work independently, own your tasks, communicate clearly, and suggest improvements when you see them. Do that well and there’s steady, long-term work waiting for you. Deliverables for the initial sprint • Enhanced microservice modules, tested and deployed to our AWS environment • New API endpoints, fully documented and integrated with the existing React Native app . Fixing bug with FCM notifications . integrate chat component The codebase is mature and already serving users, so reliability, professionalism, and trustworthiness are non-negotiable. If that sounds like you, let’s get started.
ID do Projeto: 40165928
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Ativo há 15 dias
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Hi Omar M., I have carefully reviewed your project requirements and I am confident that I can deliver exceptional results. With over 12 years of experience in API development, I am well-equipped to handle the tasks at hand with precision. I am eager to discuss your exciting project further and explore how we can collaborate to bring your vision to life. Let's connect in chat to delve deeper into the specifics. Feel free to take a look at my portfolio for a glimpse of my previous work: [login to view URL] [login to view URL] [login to view URL] [login to view URL] and many more..... Looking forward to the opportunity to work together. Best regards, Nadeem
$5 USD em 40 dias
4,0
4,0
102 freelancers estão ofertando em média $9 USD/hora for esse trabalho

I am an expert in c# microservices and react native both and can deliver quality work, i understand that you are interested in paying for only worked hours not on time spend understanding code.
$6 USD em 40 dias
8,6
8,6

Hello! What you’re describing is very much production work, not greenfield experiments, and that’s where I’m most comfortable. A mature .NET 8 microservice system with real users means changes have to be deliberate, tested, and shipped cleanly, not “try and see.” My focus would be squarely on the backend as you outlined. Extending existing microservices in C#, adding new APIs with clear contracts, wiring events correctly through RabbitMQ, and persisting data reliably in PostgreSQL. I’m used to containerising services, deploying to Ubuntu-based AWS setups, and pushing changes all the way to production without disrupting live traffic. For the sprint items, I can handle exposing and documenting new endpoints for the React Native app, tracking down and fixing the FCM notification issue at the service level, and integrating the chat component from the backend side so it behaves predictably under load. I pay attention to logging, error handling, and backward compatibility so mobile clients don’t break unexpectedly. I work independently, manage my own tasks, and communicate clearly about what’s done, what’s blocked, and what could be improved. I’m fine with the hands-on-only billing model and focused on delivering working code, not billable noise. If you want someone who can step into a live system and move it forward safely, I’m ready to start. Best Regards, Jenifer
$8 USD em 40 dias
8,4
8,4

As a seasoned Full‑Stack Developer, I bring 15+ years of experience delivering secure, scalable solutions across web and mobile platforms. My expertise lies in backend development with C#, .NET, and SQL Server, complemented by hands‑on work with microservice architecture—containerized services, event wiring via RabbitMQ, and data persistence in PostgreSQL—ensuring robust, high‑performance codebases. I’m equally adept with Linux (Ubuntu servers) and AWS deployment strategies, enabling reliable infrastructure management and smooth scaling. With mature codebases serving active users, I prioritize integrity, professionalism, and proactive improvement, taking ownership while suggesting enhancements that drive steady advancement. What sets me apart is my business‑focused approach: I don’t just write code, I craft solutions aligned with client goals. At $6/hour, I offer cost‑effective, independent execution with clear communication and dependable results. If you’re seeking a developer who combines technical depth with strategic insight, let’s connect to accelerate your platform’s evolution toward greater functionality and user satisfaction.
$7 USD em 40 dias
8,2
8,2

I have extensive experience with similar PROJECT ---->>I am highly qualified to do this job with high QUALITY ----- I am Passionate .NET/Full stack developer having rich experience with so many successful Tasks. I have some queries to give you accurate time and price Please ping me to get started and provide you great results. Thanks
$10 USD em 40 dias
7,9
7,9

Hi, I’m a backend-focused .NET 8 developer with experience over 12+ years of building and extending microservice-based systems in production. I can: Extend .NET microservices and add new APIs Work with Docker, RabbitMQ, PostgreSQL, AWS (Ubuntu) Fix FCM notification bugs Support backend integration for the chat component I work independently, write clean and reliable code, and deploy safely to production. Available long-term at your rate and ready to start. Ranuka
$5 USD em 40 dias
6,1
6,1

Hello, Hope you are doing well! I am a .NET developer with strong expertise in building secure, scalable, and high-performance applications. I work with both frontend & backend frameworks to deliver end-to-end solutions using modern Microsoft technologies. What I Can Deliver: 1. Full backend development using .NET Core 2. Secure & scalable RESTful APIs 3. Enterprise web applications with MVC or Razor Pages 4. Fully optimized SQL Server databases 5. Payment gateway / third-party API integrations 6. Role-based authentication & authorization 7. Admin dashboards, CRUD operations, reporting modules 8. Microservices architecture (if required) 9. Application maintenance & bug fixing 10. Cloud deployment (Azure App Services / AWS) Why Choose Me: 1. Clean, maintainable & scalable code 2. Strong problem-solving & debugging skills 3. On-time delivery with proper documentation 4. Experience in enterprise-level systems 5. Strong communication & requirement understanding Let's Get Started Share your requirements or a sample/reference website — I will provide: 1. Best approach 2. Timeline 3. Cost estimate Looking forward to working with you!
$7 USD em 40 dias
5,9
5,9

HELLO!! I HAVE REVIEWED YOUR REQUIREMENTS CAREFULLY AND UNDERSTAND THE NEED TO EXTEND YOUR .NET 8 MICROSERVICES BACK-END, DELIVER NEW API ENDPOINTS, AND SUPPORT YOUR REACT NATIVE FRONT-END. With 10+ years of experience in C#, .NET, PostgreSQL, RabbitMQ, and containerized microservices, I can deliver enhanced modules, reliable APIs with full documentation, and ensure smooth integration with your existing app. I will also address FCM notification bugs and integrate the chat component as part of the sprint. I WILL PROVIDE 2 YEARS OF FREE ONGOING SUPPORT AND COMPLETE SOURCE CODE, AND WE WILL WORK USING AGILE METHODOLOGY, PROVIDING ASSISTANCE FROM ZERO TO PRODUCTION DEPLOYMENT. I eagerly await your positive response. Thanks
$8 USD em 40 dias
5,8
5,8

Hi there. I am very excited with your project because I have completed similar project recently. The skills required for your project are my main specialty. I can handle this perfectly and have abundent experiences. Please confirm that I am one of the best fits for you and drop me a message for further discussion. Thanks and Best Regards.
$20 USD em 40 dias
5,8
5,8

Experienced full-stack developer with strong expertise in .NET 8, C#, microservices, and React Native. Proficient with PostgreSQL, RabbitMQ, Docker, AWS, and Linux. I deliver high-quality, production-ready code with clear documentation. I understand your requirement for independent work and reliability. I can tackle FCM notifications, chat integration, and API endpoints efficiently. Ready to commit to long-term collaboration and contribute ideas for system improvements.
$5 USD em 30 dias
5,3
5,3

With my demonstrated experience as a Full-Stack Developer for the past decade, I understand the value of reliability, professionalism, and trustworthiness that your project demands. My specialization in .NET and API Development has prepared me well to seamlessly integrate new functionalities into your existing system while ensuring its stability. I am no stranger to Linux, using Ubuntu servers in past projects, and have the expertise of wiring events through RabbitMQ that adds value to your task list. What sets me apart from other developers is not only the technical proficiency - writing C#, containerizing services, or deploying on AWS - but also my passion towards developing state-of-the-art applications. I actively seek out new technologies and with my continued education approach, I remain ahead of the curve with industry trends and advancements. This ensures that I am not only proficient in your current tech stack but also proactive about suggesting improvements where possible. Lastly, I understand delivering clean code is crucial for long-term maintainability. My commitment to thoroughly testing all modules before deploying them guarantees bug-free deliverables. As a self-directed professional who thrives in owning tasks independently, you can trust me not just for this sprint, but for steady and long-term work waiting ahead.
$5 USD em 40 dias
5,3
5,3

As a Full-Stack Developer with over 7 years of experience, I possess a deep understanding of not only .NET and React Native which are crucial for your project, but also the entire development lifecycle, cloud deployment, and strong DevOps skills that align perfectly with your needs. My proficiency in Linux servers and PostgreSQL database administration also adds value to your AWS hosted app. Over the years, I've always prioritized clean code, performance optimization, reliable system architecture, and resilience in all my projects - precisely what you required - on top of that my competency in troubleshooting bugs will ensure swift resolution of the FCM notifications issue. On a personal note, I'm self-driven, take ownership of my tasks and work well independently; suggesting process improvements proactively is an inherent part of my work ethic. With me, you're guaranteed a highly professional approach towards your live production app. Let's collaborate to enhance your microservice modules, develop well documented APIs integrated with your React Native app while fixing any bugs and integrating the chat component efficiently. Let’s turn your ideas into reality and bolster your app’s functionality while maintaining reliability!
$6 USD em 40 dias
5,2
5,2

Hello There!!! ⚜⭐⭐⭐⭐⚜(( Extend and stabilize a live .NET microservice backend for production scale ))⚜⭐⭐⭐⭐⚜ Working on a live production system where code ships directly to users requires discipline, clarity, and respect for what already exists. Your setup with .NET 8 microservices, React Native, RabbitMQ, and PostgreSQL on AWS clearly points to a backend first role focused on reliability and delivery, not experimentation. You are looking for someone who can step into a mature codebase, extend services cleanly, expose well documented APIs, and deploy with confidence. I have solid experience building and evolving .NET based microservice systems on Linux, containerising services, handling async messaging, and integrating APIs consumed by mobile apps. My approach would be to understand service boundaries first, then implement new functionality with minimal risk, clear documentation, and production ready testing so releases stay predictable. Three key areas I would focus on: • Extending .NET 8 microservices and shipping stable production code • Designing and documenting APIs consumed by the React Native app • Fixing FCM notification issues and integrating real time chat components If you want a dependable backend developer who owns tasks and communicates clearly, I would be happy to discuss the first sprint and priorities. Warm Regards, Farhin B.
$5 USD em 40 dias
4,9
4,9

Hi, I work with production-grade .NET microservices and React Native apps on Linux-based AWS stacks, so extending your existing architecture and shipping stable features fast is very familiar territory. I can focus first sprint on backend-heavy work while keeping the React Native integration clean and non-disruptive for current users. For the initial 7–10 day sprint, the plan is to extend your existing .NET 8 microservices by adding the required RabbitMQ events and PostgreSQL persistence with proper unit/integration tests, design and document the new API endpoints, then integrate them into the current React Native flows without breaking existing behavior, and finally diagnose and fix the FCM notification problems while integrating a robust chat component with reliable message delivery, logging, and basic monitoring around both features so the new functionality is production-ready and observable from day one. What are the highest-priority APIs and FCM/chat issues you want solved in the very first sprint so we can define a clear, testable done-state ? If you are open to a short technical call, a quick walkthrough of the current microservice layout, deployment flow, and existing API docs will help ensure safer, faster releases from day one. Regards Sahanaj
$20 USD em 40 dias
5,0
5,0

Greetings, I appreciate the opportunity to help you enhance your live production app. It sounds like you need a dedicated full-stack developer to extend your .NET 8 microservice architecture and develop new APIs, with a focus on reliability and clear documentation. I'll approach this by diving into your existing codebase, ensuring that I understand the current setup, and then efficiently adding the required features while maintaining high-quality standards. With my experience in C#, PostgreSQL, and RabbitMQ, I can tackle the enhancements you need, as well as fix the FCM notification bug and integrate the chat component seamlessly. I believe effective communication and a proactive approach to improvements are key to a successful collaboration, and I'm ready to take ownership of the tasks. Best regards, Saba Ehsan
$5 USD em 40 dias
4,7
4,7

Thanks for the clear brief. I can absolutely help, and I want to be upfront: at $6/hour, I can still deliver the work, but only if the scope is strictly limited to hands-on development with minimal support overhead (no architecture consulting, no deep research, no extensive onboarding). That said, I can help you with the immediate priorities: new API endpoints, microservice extensions, RabbitMQ wiring, PostgreSQL persistence, and production deployment, plus FCM notification fixes and chat integration—all in a stable, production-safe way. ✅ What I can deliver in the initial sprint Extend microservice modules with clean C# .NET 8 code and new endpoints Integrate RabbitMQ events across services Persist new data in PostgreSQL with migrations Deploy updated containers to AWS (Docker + ECS/containers) FCM notification bug fix and reliable delivery Chat component integration (backend + API + frontend hooks) ⚠️ What I need from you to move fast To start immediately, I’ll need: Repo access (read/write) AWS access (or CI/CD credentials) Current API docs / swagger FCM credentials and notification logs Chat provider details (if any) Next step If you’re happy to proceed, I’ll start by reviewing the codebase and immediately submit a sprint plan with clear milestones, so we don’t waste time. Reply “START” and send access details, and I’ll begin today.
$5 USD em 40 dias
5,5
5,5

You need a reliable developer to expand your .NET 8 microservices and APIs. I will extend your backend with new, tested modules and APIs, addressing FCM notifications and chat integration. This approach prioritizes direct delivery of production-ready code. I will clearly communicate throughout, suggesting improvements as I build. This covers the described sprint deliverables. Any unforeseen complexities will be flagged immediately. Recently, I delivered a similar API extension for a financial services client, increasing their transaction processing capacity by 30%. Are your AWS credentials set up for immediate deployment access?
$5 USD em 40 dias
4,7
4,7

I’m a .NET developer experienced with microservices, PostgreSQL, and API design in production environments. I can extend your .NET 8 services, containerize them, wire events through RabbitMQ, and ship reliable APIs that integrate smoothly with your React Native app. I’ll also fix the FCM notification issue and implement the chat component with clean, testable code. Comfortable working on Ubuntu/AWS, I communicate clearly, work independently, and focus on stable deployments that add real value from day one.
$5 USD em 40 dias
4,8
4,8

With years of experience under my belt, I’m confident that I have the skills and knowledge you need for your project. As a Senior Full-Stack Developer, I've successfully built similar setups combining .NET with React Native and hosted on AWS, showing my ability to work effortlessly end-to-end. Throughout my career, I’ve consistently demonstrated my proficiency in developing APIs, event handling through RabbitMQ, deploying services on Ubuntu servers, and managing data persistence using PostgreSQL— all of which align perfectly with your project requirements. Moreover, my expertise in containerizing services and familiarity with backend systems improve code management considerably. I value professionalism, reliability, and trustworthiness- qualities that are essential when working with live production apps like yours. Thus, you can count on me to be an independent worker who takes ownership of tasks, finds solutions efficiently, and delivers results in a timely manner. As a dedicated professional who treats every project as an opportunity for growth and improvement, I would be thrilled to contribute to the continued success of your app. Let's venture into this promising partnership and deliver high-quality solutions together!
$5 USD em 40 dias
4,2
4,2

Nice to talk you , After reading in detail the requirements of your project and concluding that they match my areas of knowledge and skills, I would like to introduce myself. My name is Anthony Muñoz and I am the lead engineer for DS Pro IT agency. I have worked for over 10 years in Backend and software development and have successfully done multiple jobs. It will be a pleasure to work together to make your project a reality. Please feel free to contact me. I´m looking forward to working with you. I really appreciate your time and remain attentive to any request or question. Greetings
$16 USD em 40 dias
4,2
4,2

❤️Timeline: 14 days | Cost:$6/hour | Full-time availability in your time zone❤️ Hello I’ve solved this exact problem before and can deliver production-ready .NET microservice extensions with documented APIs in 14 days. Based on my past experience, the real challenge is shipping changes fast without breaking live traffic. I’ve worked on mature systems where small event or FCM changes caused outages. I prevent that by isolating services and validating flows end to end. ✔ New C# microservice logic with clean APIs and PostgreSQL persistence ✔ RabbitMQ event wiring plus FCM bug fix verified in production ✔ Chat integration tested against existing React Native consumption To proceed, I only need repository access, deployment process details, and priority order for the first sprint tasks. Looking forward to discussing more in detail on chat!
$6 USD em 40 dias
3,7
3,7

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