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I’m looking for someone who can take full ownership of our server-side codebase and keep it evolving over the next several months. The immediate need is to design and implement RESTful APIs that handle user authentication and authorization, data retrieval/manipulation, and a handful of third-party integrations. Most of our existing micro-services are written in Python and Java, with a few high-performance components in Go, so the more comfortable you are jumping between those languages the better. You’ll be expected to: • Draft an endpoint specification we can review together. • Build the services in clean, idiomatic Python, Java, or Go (your choice per module), following REST best practices. • Wire in secure auth (JWT, OAuth2, or similar) and role-based access control. • Integrate external services where required, shielding the core logic behind well-tested adapters. • Provide unit tests, concise inline documentation, and a short README for every deliverable. • Push everything to our private Git repo and keep the CI pipeline (GitHub Actions) green. Success is a set of working endpoints that pass our automated test suite, are readable by the next developer, and can be deployed straight into Docker/Kubernetes without surprises. If that sounds like your kind of project, let’s talk code and timelines. I ONLY CONSIDER APPLICATIONS THAT ARE NOT AI GENERATED. IN ORDER TO QUALIFY FOR THIS JOB TELL ME 2-3 SENTENCES ABOUT YOUR PERSONALITY
Project ID: 40401194
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355 freelancers are bidding on average $13 USD/hour for this job

Hi there, I’m Muhammad Awais. I’m excited by your long-term backend challenge and ready to take full ownership of your server-side codebase. I’ll design and implement clean, RESTful APIs across Python, Java, and Go, with secure auth (JWT/OAuth2) and RBAC, and create well-tested adapters for external services. I’ll draft endpoint specs for review, ensure your CI stays green, and deliver concise docs and a small README for each deliverable. The goal is a readable, deployable set of endpoints that pass your tests and slide into Docker/Kubernetes without surprises. I focus on practical, maintainable code, with clear boundaries between core logic and integrations, so the next developer can pick up easily. I’m detail-oriented, proactive, and value clear communication and reliable delivery. How do you envision the auth strategy across services (JWT vs OAuth2 per service) and what are the key RBAC roles you need from Day 1? What is the current test suite coverage and what are the most critical paths to pass first? Which external services require adapters, and are there preferred libraries or patterns you want? Do you have an existing API style guide or API versioning scheme I should align with? What runtime constraints exist (memory, CPU) for your Python/Java/Go components? Which CI/CD workflow steps are mandatory (lint, security scan, container scanning) beyond the existing pipeline? What are your deployment targets (Kubernetes namespaces, Helm charts) and any secrets m
$25 USD in 22 days
9.6
9.6

Hello, About my working style/personality: I prefer structured, well-planned engineering work where system design is defined before coding. I focus on maintainable, production-grade backend systems over quick fixes and keep communication clear and low-noise. I’ve worked with Python, Java, and Go, choosing each based on performance and maintainability needs. My approach starts with clear API contracts, then modular, testable services with clean separation of auth, core logic, and integrations. I’ve built REST APIs with JWT/OAuth2, RBAC, and CI/CD pipelines using GitHub Actions. For your project, I would first align on endpoint specifications, then implement modular services with clean adapters for external systems, strong unit tests, and Docker/Kubernetes readiness. Happy to discuss your current architecture and priority endpoints. Best, Niral
$10 USD in 40 days
8.2
8.2

With nearly two decades in the industry, my team at CnELIndia has honed its API development skills to craft robust, efficient, and future-proof server-side codebases. Our deep-rooted experience in Python and Java development as well as our ability to proficiently jump between multiple languages, including Go, ensures that we can navigate your existing micro-services with ease. More than just pure technical competence, we bring a creative approach to RESTful API design and implementation. We not only strive to meet your immediate needs but also think ahead to build adaptable solutions that can grow and evolve alongside your business. By carefully integrating secure authorization methodologies like JWT or OAuth2 - we'll establish an unrivaled layer of data protection while providing readable documentation for even the next developer to comprehend. Building on this, CnELIndia doesn't just write code; we build solutions and relationships. This commitment is reflected in our detailed unit tests and concise inline documentation for every module that not only pass your automated suite but make it easier for you to maintain things going forward. Rest assured, our strong work ethic combined with our drive for innovation will not only meet your expectations but exceed them, delivering a deployable product that leaves no surprises. Let's collaborate to create something incredible in a timely and budget-friendly manner!
$12 USD in 40 days
7.9
7.9

Hello, I like owning things end to end and keeping them clean as they grow. I’ve worked across python based services and APIs with auth, integrations, and scaling in mind, so jumping between services and keeping things consistent is something I’m used to. Personality wise, I’m pretty straightforward and calm under pressure. I like figuring things out quickly, but I don’t rush sloppy work I’d rather ship something solid and keep improving it step by step. Kindly contact me for further discussion.
$20 USD in 40 days
7.9
7.9

Hi, I enjoy working on systems that need clarity and long-term stability. I’m someone who prefers clean architecture over quick fixes. I’m methodical in debugging and design, and I communicate clearly to keep things moving. I also take ownership seriously and ensure everything I build is reliable and easy to maintain. On the technical side, I specialize in Python for building RESTful APIs, implementing secure authentication (JWT/OAuth2), RBAC, and scalable service design. I deliver clean, well-tested code with proper documentation, ready for Docker/Kubernetes and CI pipelines. Happy to discuss your current services and get started. Best regards. Ludiac
$15 USD in 40 days
7.7
7.7

Hi there, I am senior software developer, spent around 10 years working across frontend, backend systems, APIs and microservices. I usually take ownership of the full project, handling API design, auth, integrations and keeping everything stable. I am simple and focused person. I like clean code and clear communication. I don’t overcomplicate things and try to keep work practical and stable. I have read the requirement. Once you confirm the current codebase access and priorities, I can start quickly and align the API structure as needed. My approach is to first review existing services and flows, then define clear API structure, implement endpoints step by step with proper auth and integrations, and keep testing and improving so everything stays stable and easy to maintain. Let’s connect and discuss timelines. Thanks, Rahul A.
$8 USD in 40 days
7.6
7.6

█▓▒▒░░░Dear Client░░░▒▒▓█ this is not AI GENERATED and estimate timeline 8 ~10 weeks as you know, to do build scalable APIs, it's important secure auth and clean service isolation and As a Full stack developer with 10 years experience, your project is an ideal match with my skill sets, specialized in Python, Java, Please message me to get started ASAP.
$15 USD in 40 days
7.7
7.7

As a highly experienced backend developer and architect with a decade-long tenure, I believe my skills are a strong match for what you’re seeking. I have an in-depth understanding of designing, implementing and ensuring the maintainability of RESTful APIs in not just one or two, but three languages - Python, Java and Go. This makes me incredibly versatile and adaptable to the tech stack your project requires. Beyond my polyglot abilities, my adherence to best practices and expert grasp on security measures is precisely what's wanted for this job. My past involvement with intricate systems like those in finance and healthcare mirrors the complexity I anticipate with your project. I approach these challenges systematically with measures including OAuth2, JWT etc., ensuring robustness and long-term sustainability. My experience doesn't stop at simply handling APIs and security; it extends to containerization (Docker), CI/CD pipelines as well as AWS-based deployments that aligns perfectly with your project's expectations of Docker/Kubernetes based deployment. Additionally, I am well-versed in latest trends such as AI integrations (GPT-3), utilizing them not just for novelty but to improve code quality and developer productivity by integrating these powerful tools for smarter processes. Let's discuss how I can ensure success for your project while keeping code readable for future teammates.
$12 USD in 40 days
7.3
7.3

We’re a small, senior team of backend engineers with deep experience across Python and Java microservices, and we’ve spent years owning production systems end-to-end—design, build, deployment, and evolution. Your requirement for clean, maintainable APIs with strong auth, integrations, and CI discipline aligns closely with how we already work. We’d start by drafting a clear endpoint spec (OpenAPI), then implement modular services using Python (FastAPI) or Java (Spring Boot) where appropriate. We follow strict REST conventions, implement JWT/OAuth2 with RBAC, and isolate third-party integrations behind tested adapters. Every module comes with unit tests, concise docs, and Docker-ready configs, ensuring smooth Kubernetes deployment and a stable GitHub Actions pipeline. As a team, we’re pragmatic and low-ego—we care more about clean solutions than flashy ones. We communicate clearly, challenge assumptions when needed, and take ownership without hand-holding. We also genuinely enjoy refining systems over time, not just shipping v1. Happy to discuss timelines and dive into your current architecture.
$20 USD in 40 days
7.3
7.3

Hi, I’m Abhishek Rathore, a senior backend engineer. You need someone to own your evolving microservices, design clean REST APIs, and handle auth, integrations, and CI without breaking deployability—I can take that end-to-end. ? Approach I’ll define endpoint specs first (OpenAPI) and review with you. Services will be built in Python (FastAPI) or Go for performance-critical paths, with clear separation via adapters for third-party integrations. ✅ Core Features • RESTful endpoints with versioning and clear contracts • JWT/OAuth2 auth with role-based access control • Clean data layers with validation and error handling • Third-party integrations via isolated, testable adapters • Unit + integration tests aligned with CI (GitHub Actions) • Docker-ready services for Kubernetes deployment ☁️ Reliability / Performance Stateless services with structured logging, retries for external calls, and caching (Redis where needed). I’ll ensure backward compatibility and stable CI by enforcing test coverage and linting. ? Deliverables Working APIs, OpenAPI spec, tests, README per service, and clean Git commits ready for deployment. ? Why Me I’ve built similar multi-language microservice systems, including Rhythm, where reliability and clarity were critical. How are you currently managing service-to-service auth across languages—shared middleware or per-service implementation?
$12 USD in 5 days
6.6
6.6

Hello there, I am excited about the opportunity to take full ownership of your server-side codebase and drive its evolution over the coming months. My expertise lies in designing and implementing RESTful APIs for user authentication, authorization, data handling, and third-party integrations across Python, Java, and Go. I am committed to delivering a robust solution that includes endpoint specification, clean code development, secure authentication, seamless integration of external services, thorough testing, and continuous integration maintenance. I look forward to collaborating with you on this project to achieve a set of working endpoints that meet your requirements. Regards, Yogesh Kumar
$9 USD in 32 days
6.8
6.8

Hi, Your codebase likely needs stricter auth scaffolding and clear service boundaries—JWT/OAuth2 with RBAC plus adapter layers will prevent third-party logic bleeding into core services. You mention Python, Java, and Go microservices, REST endpoints, GitHub Actions, and Docker/Kubernetes; I’ll match language choice per module and deliver endpoint specs, tests, and READMEs. First debugging/build angle: - Draft endpoint spec and contract tests to validate behavior before implementation - Implement auth layer (JWT/OAuth2) + RBAC middleware and adapter interfaces for integrations I treat uptime and data integrity as priorities—CI, unit tests, and idempotent adapters reduce deployment risk. I’m pragmatic, detail-oriented, and communicative. Ready to start drafting the first endpoint spec—when should I fork the repo? — Smith
$12 USD in 40 days
6.6
6.6

With a keen eye for detail and expertise in API Development, Java, Mobile App Development, Python, and Software Architecture, I am fully equipped to take on your project as the 'Long-Term Backend API Developer.' My name is Asif, and my team at Einnovention has a proven track record of delivering high-quality, scalable, and innovative solutions. Combining our technical proficiency and your project specifications, we promise an outcome that passes automated tests seamlessly, integrates third-party services effectively while remaining readable for future developers. Our versatility with multiple languages including Python, Java, and Go aligns perfectly with the requirements of this project. We are accustomed to Clean REST API development following best industry practices. Our experience in handling secure auth (JWT, OAuth2, or similar) and role-based access control will ensure that your user authentication and authorization processes run smoothly. With us on board, your core backend logic will be shielded behind rigorously tested adapters - guaranteeing maximum functionality for all external services integrated. .
$12 USD in 40 days
6.8
6.8

Hi there! I'm Ignacio. I'm a computer engineer with 7 years of experience working on backend systems, APIs, and automation. Most of my work has been in Python environments, but I’ve also worked with Java and explored Go for performance-critical tasks. I’ve built and maintained APIs, handled integrations, and worked on data-heavy systems where structure, reliability, and clean design are essential. I’m comfortable designing REST endpoints, handling authentication (JWT/OAuth2), and structuring services so they remain maintainable over time. I also care about having proper tests, clear documentation, and keeping things stable in CI/CD environments. I’ve worked with Docker-based deployments and understand the importance of delivering something that works smoothly in production. I like taking ownership of systems and improving them step by step, not just delivering code and moving on. About my personality, I’m someone who works well under pressure but prefers to stay organized and ahead of deadlines. Outside of work, I’m into sports like climbing and skateboarding, and I balance my technical side with creative hobbies like drawing, piano, and photography. Happy to discuss scope and next steps. I’m confident a quick call will show I’m a strong fit for this project.
$15 USD in 40 days
6.7
6.7

Hi There!!! ★★★★ ( Long-term backend ownership & clean scalable APIs ) ★★★★ Project understanding: You need a long-term backend developer to design and maintain RESTful APIs across Python, Java, and Go microservices. Work includes authentication, third-party integrations, CI/CD stability, Docker/Kubernetes readiness, and clean documentation with test coverage. Services ⚜ Design REST endpoint specs & API contracts ⚜ Build Python/Java/Go microservices ⚜ JWT/OAuth2 auth & RBAC security ⚜ Third-party integrations with clean adapters ⚜ Unit tests & CI GitHub Actions maintenance ⚜ Docker/Kubernetes deploy ready services ⚜ Documentation & README per module I have solid backend experience working with REST systems and distributed services, mainly in Python and Java environments, also some Go services. I like solving backend problems and I enjoy switching between systems when needed. I am calm under pressure and prefer clean simple architecture over over-complicated stuff. I understand they want non-AI generic responses, so I keep communication real and technical from actual implementation experience. Lets connect and discuss current architecture and next steps, I can start immediately. Warm Regards, Farhin B.
$8 USD in 40 days
6.6
6.6

THIS IS REAL PROPOSAL==>>I am confident to take backend systems and building clean, reliable APIs that are easy for others to understand and extend. I’m comfortable working across Python, Java, and Go, and I focus on writing well-structured code with strong testing, clear documentation, and smooth CI/CD integration. On a personal level, I’m someone who stays calm under pressure, likes solving complex problems step by step, and values clear communication so projects move forward without confusion. Thanks!!
$15 USD in 40 days
6.3
6.3

Your microservices architecture will fail under load if you're not implementing circuit breakers and retry logic for those third-party integrations. One flaky external API can cascade failures across your entire system, taking down healthy services with it. Before I draft the endpoint spec, I need clarity on two things. First, what's your current request volume and expected growth trajectory - are we talking 100 requests per second or 10,000? Second, do your existing Python and Java services share a common authentication layer, or am I building this from scratch and potentially forcing a migration? Here's the architectural approach: - JAVA SPRING + OAUTH2: Implement a centralized auth service with refresh token rotation and Redis-backed session management to handle 50K concurrent users without database bottlenecks. - PYTHON + FASTAPI: Build data retrieval endpoints with Pydantic validation and async database connections, reducing response times from 800ms to under 150ms. - DOCKER + KUBERNETES: Structure services with health checks, resource limits, and horizontal pod autoscaling so your CI pipeline catches deployment issues before production. - THIRD-PARTY ADAPTERS: Wrap external APIs with retry policies, timeout handling, and fallback responses so one vendor's downtime doesn't kill your platform. - UNIT TESTS + INTEGRATION TESTS: Achieve 85%+ coverage with pytest and JUnit, plus contract testing to catch breaking changes between services. I've built similar polyglot systems for 4 SaaS companies that scaled past 100K users. I don't start coding until we've mapped out failure scenarios and rate limits. Let's schedule a 20-minute technical call to align on architecture before I draft the spec. Personality-wise: I'm direct and ask uncomfortable questions early because I'd rather surface problems in week one than week ten. I'm also weirdly obsessed with reading other people's code - I actually enjoy inheriting messy codebases and refactoring them into something maintainable. Outside of work I'm into long-distance running, which probably explains why I treat software like an endurance sport rather than a sprint.
$11 USD in 30 days
6.4
6.4

Hello dear, Toriqul Global Solutions is a professional web design and development company dedicated to building modern, high-performance, and user-friendly digital solutions. Founded by Engineer Md. Toriqul Islam, a Computer Science & Engineering graduate from RUET, the company has over 10 years of experience delivering scalable and visually appealing websites. Web Design & Development: We are a full-stack web development team with strong experience. Our design approach is modern and simple, helping attract and engage users effectively. We have built websites for various industries and worked with many clients, delivering high-quality solutions. Client satisfaction is always our top priority. Technologies We Use: HTML5, CSS3, Bootstrap, JavaScript, jQuery, Angular, React, Node.js, WordPress, PHP, Laravel, .NET, CodeIgniter, Python, Ruby on Rails, MySQL, MongoDB. Why Choose Us: • Modern, clean, user-focused design • Fully responsive on all devices • Scalable and optimized code • Clean and well-documented work • On-time delivery • Clear communication • Client satisfaction first We have worked with clients across different industries, delivering websites that meet business goals and user expectations. Let’s build something great together. We are ready to discuss your project and start immediately. Best Regards, Toriqul Global Solutions
$12 USD in 40 days
6.0
6.0

Hey there, I’m someone who values clarity, ownership, and getting things done properly rather than quickly—I tend to think in systems, break problems down logically, and keep communication straightforward and honest throughout a project; I’m also very detail-oriented when it comes to backend architecture, but flexible enough to adapt across Python, Java, or Go depending on what fits best. On the technical side, I have strong experience building production-grade REST APIs, I can take full ownership of your backend, from endpoint design to stable delivery, ensuring everything is scalable, readable, and easy for future developers to maintain let’s connect and align on the architecture and timeline, Taher
$15 USD in 40 days
6.2
6.2

Hi This kind of backend ownership requires more than just writing endpoints, it needs consistency across services, clean abstractions, and production-ready reliability. I can design and implement RESTful APIs across Python, Java, and Go, ensuring each service follows best practices, integrates cleanly, and is fully testable and deployment-ready. I have experience working with multi-language microservice environments, handling authentication flows, RBAC, and third-party integrations through well-structured adapters. I will define clear endpoint specs, implement secure auth, and maintain clean, readable code with proper testing and CI alignment so your pipeline stays stable. I am someone who enjoys digging into systems, understanding how everything connects, and improving it piece by piece. I tend to communicate clearly, keep things practical, and focus on delivering code that other developers can easily pick up and extend. Best, Justin
$50 USD in 40 days
5.9
5.9

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