Python FastAPI Backend Developer – Ongoing Part-Time Work

@tadinhkien

Greetings, Thank you for considering my application for this project. As an AI Engineer and Python Developer with over 8+ years of experience, I bring a wealth of knowledge and expertise in the field of Python, Deep Learning. I have carefully reviewed the project description and am eager to discuss your specific needs and requirements in more detail. My commitment is to provide dedicated support and consistent follow-up throughout the project's lifecycle. Please feel free to reach out to me to further discuss how I can contribute to the success of your project. Looking forward to the opportunity of working together. Best regards, KuroKien

@mubeenm5026

FastAPI backend is my forte and your project fits right into my areas of expertise. With substantial experience in Python backend development, I have effectively implemented FastAPI in several production projects, including a notable SaaS solution. These projects demanded strong skills in Pydantic, SQLAlchemy, PostgreSQL, Git, and automated Python testing among others – completely aligning with your technology stack. What exactly sets me apart is not just my vast technical capabilities with REST APIs and third-party API integrations but also my approach to deliver maintainable code. I understand the importance of investing time in comprehending existing architectures to avoid quick-fixes that can lead to downstream chaos. My familiarity with Linear and Jira makes me efficient with independent work sorting by priorities dictated by our needs. In troubleshooting complex backend or database issues, my multitasking ability comes handy as I'm able to prioritize issues based on their impact. Being proactive, I also help identify root causes of bugs and provide long-term fixes to enhance reliability. Currently, I have 10-20 hours/ week availability which can be extended based on performance and need

@onkarkulkarni8

The production SaaS backend you described — FastAPI, Pydantic v2, SQLAlchemy, PostgreSQL, webhooks, and third-party API integrations — maps closely to the kind of typed, contract-driven backend work our team does daily, even though our primary stack is TypeScript and Node rather than Python. One concern that matters early in a codebase like this is the contract boundary between Pydantic models and SQLAlchemy ORM layers — specifically how response schemas are versioned and validated when multiple developers are touching the same endpoints. Getting that boundary right prevents a class of bugs that show up as silent data truncation or failed webhook payloads. Our team writes strongly typed code across Node and TypeScript with the same discipline — explicit schemas, validated inputs, typed query results — so the patterns translate directly. Our first step would be to review the existing schema definitions and query patterns before touching any ticket, then propose a short mapping of how filtering and reusable validation utilities are currently structured. That front-loads the review cost and means our first PR is clean and consistent with the codebase conventions. Given the ongoing hourly nature of this engagement, we can commit to starting within 1 day of onboarding confirmation and maintaining clear async communication on blockers and progress. Happy to jump on a quick call to align on the first few tickets and confirm the workflow fits your team's rhythm. Final timeline and cost will be confirmed in chat after a complete understanding and documentation of the project expectations in detail.

@mayankinnovative

With over two decades in the field, my primary focus has been business-critical work - solving issues that impact sales and system reliability. My experience aligns perfectly with your requirements for a Python FastAPI Backend Developer. With my proficiency in Python, FastAPI, Pydantic, and SQLAlchemy coupled with the ability to navigate complex backend structures and troubleshoot database-related issues, I'm confident I can make an immediate and significant contribution to your SaaS platform. Drawing from my background in PHP-based development, I have a meticulously honed ability to understand and contribute to existing production codebases - a skill critical for working efficiently alongside other developers on your platform. Additionally, my expertise in REST API design, error handling, input validation, strong Python code methodology, and SQL optimization will significantly enhance the maintainability and reliability of your platform's backend. Having collaborated with international clients for the entirety of my career, remote work holds no barriers for me. My flexible schedule will allow for roughly 10-20 hours per week initially –with potential room for more depending on performance and availability. Having read every detail of your posting (“FastAPI backend”), I assure you that by choosing me you'll not only be gaining an expert backend developer but a reliable long-term partner.

@ashinnd84

Hi there, we are a team of AI/ML Full Stack Web and Mobile App Developers and we can do this project in no time. Thanks Ashish Kumar.

@albertc1996

FastAPI backend Hello, I have experience building and maintaining Python backend applications using FastAPI, REST APIs, PostgreSQL, and SQLAlchemy-based ORM solutions. My approach is to first understand the existing architecture, then implement clean, well-tested features while keeping the codebase maintainable. Before we begin, I have two questions: * What project management tool do you use (Jira, Linear, GitHub Projects, etc.), and how are tasks typically assigned? * Is the current test suite already established, or will new tests need to be created for most features? I'm a backend developer specializing in Python, FastAPI, Django, PostgreSQL, authentication systems, API integrations, webhooks, Docker, and Git. I enjoy working with existing production systems, debugging complex issues, and submitting clean pull requests with clear documentation. I'm available for long-term collaboration and can dedicate 15–20 hours per week.

@mobiwebsolutions

FastAPI backend ✋ Hi There!!! ✋ The Goal of the project:- Provide reliable ongoing FastAPI backend development with clean, maintainable code, well-tested features, and seamless support for your production SaaS platform. I carefully read the complete project description and understand you need long-term part-time support within an existing FastAPI codebase, focusing on quality, testing, pull requests, and scalable architecture. I am the right fit with 9+ years experience as a full stack developer and have completed similar production Python SaaS backend projects. • FastAPI, Pydantic v2, SQLAlchemy, PostgreSQL, REST APIs, and webhook integrations • Bug fixing, automated testing, GitHub pull requests, database management, and performance optimization • API development, code reviews, full source code delivery, testing, and ongoing maintenance Looking forward to chat with you for make a deal Best Regards Elisha Mariam!

@TechizeBuilder

Dear Client, I read "Python FastAPI Backend Developer – Ongoing Part-Time Work" carefully and understand what you're looking to achieve with this Mern Stack Development project. My hands-on experience with JavaScript, Python, PostgreSQL, Backend Development aligns directly with what you need. I've delivered similar Mern Stack Development work end to end — clean, scalable and on time — and I can share closely related samples and start right away. A few quick questions to get us started: 1. Do you have detailed requirements ready, or should we define the scope together? 2. What's your target timeline for the first working version? 3. Are there existing designs, code or systems I should build on? Thanks & Regards, Deepak

@kend27

FastAPI backend Hi, This is exactly the kind of backend work I've been doing for the past several years. I have strong production experience with Python, FastAPI, Pydantic v2, SQLAlchemy, and PostgreSQL, building and maintaining APIs, integrating third-party services, and supporting long-running SaaS products. I'm comfortable joining an existing codebase, understanding the architecture before making changes, and delivering clean, well-tested pull requests. I've worked extensively with webhooks, REST APIs, background jobs, database optimization, and troubleshooting production issues where the root cause wasn't immediately obvious. I write unit and integration tests, follow GitHub-based workflows with code reviews, and communicate progress and blockers clearly. My focus is always on maintainable solutions rather than quick fixes. Production example: I've built multi-tenant FastAPI platforms with complex integrations, async processing, and high-volume API traffic. Availability: 10–20+ hours/week Rate: $30/hour (negotiable) I'm happy to share my GitHub and discuss relevant backend projects.

@jagratip3

Hello! I'm Jagrati, a Python backend developer with experience building and maintaining production APIs using FastAPI, Pydantic, SQLAlchemy, PostgreSQL, and RESTful services. I enjoy working within established codebases, understanding the existing architecture, and delivering clean, well-tested solutions rather than quick fixes. My experience includes developing FastAPI endpoints, implementing reusable validation and filtering logic, optimizing SQLAlchemy queries, integrating third-party APIs and webhooks, writing unit/integration tests, and troubleshooting complex backend and database issues. I follow GitHub best practices with focused pull requests, meaningful commits, and clear communication throughout development. I'm comfortable working from Jira/Linear tickets, investigating production issues, and collaborating with distributed teams. I can dedicate 10–20 hours per week with overlap during North American or European business hours. To tailor my estimate, I have a few questions: What is the current size of the backend (services/modules)? Which testing framework do you use (Pytest, unittest, etc.)? Are there any immediate priorities or tickets you'd like the new developer to tackle first? I'd be happy to share relevant backend experience, code samples/GitHub, availability, and my hourly rate during our discussion. Best Regards, Jagrati

@anshumanvermaUK

FastAPI backend Hi, I have experience with Python, FastAPI, Pydantic, SQLAlchemy, PostgreSQL, REST APIs, and backend application development. My recent work includes production FastAPI services, AI-powered applications, third-party API integrations, webhook processing, and workflow automation with clean, well-tested code. I'm comfortable working within existing codebases, investigating complex backend issues, and submitting maintainable GitHub pull requests. Thanks, Anshuman

@zeeshan5121472

Hi, **FastAPI backend**. I’m a Full Stack Developer with 9 years of experience building and maintaining production backend systems using Python, FastAPI, SQLAlchemy, PostgreSQL, REST APIs, and third-party integrations. I’m comfortable working within existing codebases, writing clean, tested code, troubleshooting complex backend issues, and submitting well-documented pull requests. I’m available **15–20 hours per week** with overlap for North American/European time zones, and my rate is flexible based on the scope. I’d be happy to discuss my relevant projects and how I can contribute to your platform long term.

@PrateekP3003

FastAPI backend 40 hours/week, available for work You can track project progress via the tracker Hi! I’m a Python backend developer with extensive experience building and maintaining production-grade FastAPI applications. I focus on understanding existing architectures before implementing changes, ensuring every feature, bug fix, and pull request is clean, well-tested, and maintainable. I can assist you with: 1. Backend Development FastAPI, Pydantic v2, SQLAlchemy, PostgreSQL, and REST API development Reusable services, validation layers, optimized database queries, and webhook integrations Strong typing, clean architecture, and maintainable code 2. Production Support Bug investigation, root-cause analysis, and performance optimization Unit and integration testing with reliable CI/CD workflows Well-structured GitHub pull requests, code reviews, and documentation 3. Long-Term Collaboration Comfortable working from Linear/Jira tickets with regular progress updates 10–20+ hours/week availability with overlap for North American/European teams Reliable communication and a long-term, quality-first development approach I’d be happy to discuss your existing FastAPI architecture, testing strategy, and development workflow to contribute effectively from day one. Best regards, Prateek

@alluankit01

FastAPI backend developer with strong experience in Python, FastAPI, Pydantic, SQLAlchemy, PostgreSQL, REST APIs, GitHub workflows, testing, and production backend maintenance. I can support your existing SaaS backend by carefully reviewing the current architecture, working from assigned tickets, implementing clean features, fixing bugs, improving automated tests, and submitting focused pull requests. I’m comfortable with Pydantic v2 models, SQLAlchemy queries, reusable filtering/validation logic, database transactions, third-party API integrations, webhooks, and root-cause debugging. In previous backend work, I have handled production API development, database issue troubleshooting, failed workflow investigation, query optimization, API validation, error handling, and test coverage improvements. My approach is to understand the codebase first, avoid quick risky fixes, and make changes that are maintainable and easy for the team to review. I can provide: * FastAPI endpoint development * Bug fixes and feature implementation * SQLAlchemy query work * Pydantic model updates * API/webhook integrations * Unit and integration tests * Clear GitHub pull requests * Progress updates and blocker communication I’m available 10–20 hours per week for ongoing remote work and can overlap with European or North American working hours. Best regards Ankit

@rajeshrolen

Hello, I am a seasoned Python backend developer with extensive experience in FastAPI, Pydantic, and SQLAlchemy. Having worked on various production-level projects, I am well-versed in troubleshooting complex backend and database issues efficiently. I understand the importance of writing maintainable code and comprehensively analyzing existing architectures to ensure long-term stability. My approach involves meticulous testing, optimization of queries, and seamless integration of external APIs to enhance overall performance. In terms of availability, I can commit to 10–20 hours per week initially, with the flexibility to accommodate additional hours based on project requirements. My hourly rate is competitive, reflecting the quality and dedication I bring to each task. To showcase my skills further, I invite you to review my portfolio at https://www.freelancer.com/u/rajeshrolen If you'd like to discuss potential collaboration or have any questions, feel free to initiate a chat. I am eager to delve deeper into your project requirements and provide tailored solutions. Looking forward to the possibility of working together. Sincerely, Rajesh Rolen

@antonk52

Hello, FastAPI backend development requires a level of expertise I have amassed over the years, building systems that are both functional and scalable. My proficiency with Python, FastAPI and Pydantic (v2) is unparalleled, having worked on numerous backend projects including one for a large-scale SaaS platform similar to yours. I am more than just familiar with SQLAlchemy and PostgreSQL as well as Git and GitHub which ensure your code is clean and maintainable while minimizing errors. My focus on long-term maintainability aligns perfectly with your preference for writing maintainable code rather than applying quick fixes. Additionally, my thorough understanding of REST API design, error handling, input validation and database transactions makes me competent enough to contribute effectively to your existing codebase. Availability-wise, I can commit 10-20 hours per week initially with the potential for additional hours based on performance. Given that my collaboration is fully remote and I have some overlap with North American and European working hours, we should be able to communicate without issues. My hourly rate is $X. Check out my GitHub profile [provide link] or ask for relevant code samples for a clearer picture of my abilities. "FastAPI backend" is not just a phrase; it represents my mastery of the key technologies you need for this project. Let's get to work! Thanks!

@stanislavk51

FastAPI backend Hi, Your project requires maintaining an existing FastAPI backend while keeping the codebase stable and maintainable. The main focus is implementing new features, fixing bugs, optimizing SQLAlchemy queries, integrating APIs, and writing reliable tests without affecting existing functionality. I have experience with FastAPI, Pydantic, SQLAlchemy, REST APIs, and production backend development. I write clean, well-tested code and am comfortable working with existing architectures, GitHub workflows, and ticket-based development. I can share my relevant experience, availability, hourly rate, and GitHub profile. Best, Stanislav

@srdank001

FastAPI backend. Hi. ⚡I VALUE YOUR TIME AND MINE TOO!⚡ I have 8 years of backend experience with FastAPI, Pydantic, SQLAlchemy, PostgreSQL, APIs, webhooks, and automated tests. I have built production systems with complex queries and fixed database and workflow issues through root cause analysis. I am available 20 hours weekly at 5 ~ 6 USD per hour and can share GitHub samples in chat. I am sure I can complete your project perfectly as you want Looking forward for your reply Thanks Srdan

@thiagofoz87

FastAPI backend I have solid experience building and maintaining production backend systems focused on reliability, scalability, and clean architecture. My recent work has involved Python APIs, distributed systems, relational databases, asynchronous integrations, and long-term maintenance of existing codebases where understanding current architecture before introducing changes is essential. For a project like this, my approach would be to first review the existing FastAPI structure, dependency flow, SQLAlchemy models, validation layers, testing strategy, and deployment patterns to ensure new features and fixes remain consistent with the current design. I am comfortable working with typed Python code, Pydantic validation models, reusable query/filter abstractions, transactional database operations, webhook integrations, and external API workflows. I also have experience troubleshooting complex backend issues involving failed async workflows, inefficient queries, inconsistent data states, and integration edge cases. When working on production systems, I prioritize traceability, test coverage, and predictable pull requests with clear technical reasoning. I can contribute independently from Jira/Linear tickets, communicate progress clearly, and collaborate in distributed teams with code review workflows through GitHub. Availability: 15–20 hours/week with partial overlap for North American or European time zones. Hourly rate: R$ 85/hour. I can also share GitHub samples and discuss relevant backend implementations in more detail during the interview process.