FastAPI is a modern, open-source, high-performance web framework used to develop a range of different API applications. Developed with a combination of Python and Starlette, the framework is designed to help developers easily create and maintain powerful applications using the latest technologies. With FastAPI, developers can quickly build production-ready APIs that can handle response times as low as a few milliseconds or less. Moreover, FastAPI is especially useful for creating solutions that require complex data processing and includes features such as interactive documentation with fast response time, asynchronous request data validation and easy integration with databases.

A FastAPI Developer is therefore an expert in creating powerful, robust APIs that are capable of meeting the requirements of even the most demanding solutions. With the help of a FastAPI Developer, clients can create fast, reliable applications quickly and easily. The developer makes sure that all aspects related to data processing and validation are taken care of and enables applications to utilize the latest technologies.

Here's some projects that our expert FastAPI Developer made real:

  • Our developer helped clients create secure login systems through Google Authentication
  • We created databases for complex data processing solutions
  • Another client enhanced their existing systems with APIs for mobile apps
  • We changed how customers interacted with websites and digital services through fast response times
  • We helped businesses integrate digital products with custom made APIs using MongoDB and NextJS

Whether you're an individual looking for a personal project or a small team looking for an experienced FastAPI Developer to work on a larger project, Freelancer.com has you covered. With experienced developers from all over the world, you can easily find the perfect match for your project needs. So why wait? Post your project on Freelancer.com today and get one step closer to finding the perfect developer to make your vision come true!

From 28,379 reviews, clients rate our FastAPI Developers 4.91 out of 5 stars.
Hire FastAPI Developers

FastAPI is a modern, open-source, high-performance web framework used to develop a range of different API applications. Developed with a combination of Python and Starlette, the framework is designed to help developers easily create and maintain powerful applications using the latest technologies. With FastAPI, developers can quickly build production-ready APIs that can handle response times as low as a few milliseconds or less. Moreover, FastAPI is especially useful for creating solutions that require complex data processing and includes features such as interactive documentation with fast response time, asynchronous request data validation and easy integration with databases.

A FastAPI Developer is therefore an expert in creating powerful, robust APIs that are capable of meeting the requirements of even the most demanding solutions. With the help of a FastAPI Developer, clients can create fast, reliable applications quickly and easily. The developer makes sure that all aspects related to data processing and validation are taken care of and enables applications to utilize the latest technologies.

Here's some projects that our expert FastAPI Developer made real:

  • Our developer helped clients create secure login systems through Google Authentication
  • We created databases for complex data processing solutions
  • Another client enhanced their existing systems with APIs for mobile apps
  • We changed how customers interacted with websites and digital services through fast response times
  • We helped businesses integrate digital products with custom made APIs using MongoDB and NextJS

Whether you're an individual looking for a personal project or a small team looking for an experienced FastAPI Developer to work on a larger project, Freelancer.com has you covered. With experienced developers from all over the world, you can easily find the perfect match for your project needs. So why wait? Post your project on Freelancer.com today and get one step closer to finding the perfect developer to make your vision come true!

From 28,379 reviews, clients rate our FastAPI Developers 4.91 out of 5 stars.
Hire FastAPI Developers

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    I have an AWS-hosted PostgreSQL instance that collects field data from several remote monitoring nodes. I need a secure, mobile-friendly web dashboard that lets service providers see exactly when a node needs attention, review what was done in the past, and leave fresh notes for the next technician. Core build • A backend service that connects to the existing PG database using best-practice security (parameterised queries, SSL, role separation). • 5–7 polished bar-chart or table views optimised for both laptop and phone screens. Fast render times matter, so you’ll likely add sensible indexes or query tuning along the way. • Clean role-based access control with two profiles: – Admin: can modify system settings and dig through detailed logs. &ndas...

    $750 - $1500
    Sealed
    $750 - $1500
    103 bids

    Full Stack Developer Needed : Healthcare AI Platform Deployment (React + FastAPI + Huawei Cloud) We are looking for a highly skilled Full Stack Developer with strong system analysis and DevOps capabilities to work on an enterprise healthcare AI platform deployment. The ideal candidate should be capable of reading, understanding, analyzing, enhancing, and deploying an existing codebase independently with minimal supervision. ## Project Scope The platform includes: * Dashboards * AI Agent Hub * User & Access Management * WhatsApp Notifications * Multi-branch Healthcare Operations The deployment target is Huawei Cloud infrastructure. ## Technical Requirements ### Frontend * React.js * TypeScript * Dashboard development * RBAC-based UI routing * API integrations * Responsive enter...

    $265 Average bid
    $265 Avg Bid
    33 bids

    Full Stack Developer Needed : Healthcare AI Platform Deployment (React + FastAPI + Huawei Cloud) We are looking for a highly skilled Full Stack Developer with strong system analysis and DevOps capabilities to work on an enterprise healthcare AI platform deployment. The ideal candidate should be capable of reading, understanding, analyzing, enhancing, and deploying an existing codebase independently with minimal supervision. ## Project Scope The platform includes: * Dashboards * AI Agent Hub * User & Access Management * WhatsApp Notifications * Multi-branch Healthcare Operations The deployment target is Huawei Cloud infrastructure. ## Technical Requirements ### Frontend * React.js * TypeScript * Dashboard development * RBAC-based UI routing * API integrations * Responsive enter...

    $79 Average bid
    $79 Avg Bid
    14 bids

    Fix Broken Backend Deployment for Live E-commerce Site URGENT — React + FastAPI/Node + MongoDB My e-commerce website is live but login, payment, and orders are broken because the backend was never deployed properly. Need an experienced full-stack developer to fix this in 1–2 days. Current Setup • Domain: (live) • Frontend: React (Create React App) — already deployed on Vercel • Backend: FastAPI / Node + MongoDB — NOT deployed (code is in GitHub) • Originally built on: Emergent AI, then exported to GitHub • Integrations: Razorpay, Google OAuth, SendGrid The Problem REACT_APP_BACKEND_URL in Vercel is pointing to the frontend domain itself instead of a real backend. So login, payments, and orders all fail. All API keys have already been ro...

    $72 Average bid
    $72 Avg Bid
    49 bids

    Hiring: ML Engineer – Test & Learn Platform Experience: 3+ Years Location: Remote (1–2 visits to Bangalore required) Salary: ₹40,000 – ₹50,000/month --- Role Overview: We are looking for an ML Engineer to build and scale experimentation and causal inference systems. You will work on statistical engines, APIs, and cloud-based pipelines to enable data-driven decision-making. --- Key Responsibilities: - Develop ML/statistical models (DID, Synthetic Control, A/B Testing) in Python - Build and integrate FastAPI-based services - Design large-scale data pipelines using PySpark, Delta Lake, and Azure Data Lake - Optimize Spark jobs (memory, partitioning, performance tuning) - Work with Databricks for job orchestration and data workflows - Containerize and deploy applica...

    $575 Average bid
    $575 Avg Bid
    30 bids

    I’m wrapping up development of Offro, a hyper-local deals and offers app built with Flutter, FastAPI, and MongoDB. Most core functions are live—OTP login, Google-Maps-based store discovery, reward wallets, QR redemption, merchant and admin panels, and Firebase push notifications—yet the Flutter layer still needs a final round of polish before we can push to production. Here is what I need from you: • Refine the user interface so screens feel consistent, modern, and visually crisp. • Restructure navigation where flows feel clunky, ensuring back-stack behaviour and deep links work flawlessly. • Hunt down and fix the load-time and responsiveness issues that are slowing the current build, especially on the store listing and deal-redemption screens. &bul...

    $10 / hr Average bid
    $10 / hr Avg Bid
    56 bids

    I’m building a web-based AI scheduler that intelligently arranges meetings and tasks, learns from usage patterns, and presents optimal time slots through a clean browser interface. Your job is to design, train, and deploy the core scheduling engine, wire it to a modern web front-end, and make sure everything runs smoothly on common hosting platforms. What I expect: • A functional web application (front-end + back-end) that accepts natural-language or form-based requests and returns conflict-free schedules in real time. • An explainable AI component—whether rule-based optimisation, machine-learning, or a hybrid approach—that can be tuned or expanded later. • Clear documentation covering setup, model retraining, and API endpoints, plus a short hand-off c...

    $213 Average bid
    $213 Avg Bid
    275 bids

    We are seeking a strong Full-Stack React Developer to help build and improve a cloud-based IoT / telematics platform involving connected devices, GPS/location data, mobile applications, dashboards, and real-time telemetry. This role will focus heavily on front-end development while also supporting API integration and backend-related development tasks. Responsibilities include: React / front-end development Dashboard and portal development API integration Data tables, filtering, and reporting tools Real-time telemetry visualization User authentication and permissions General full-stack development support Required Experience: React TypeScript REST APIs Full-stack web application development Strong UI/UX understanding for data-heavy applications Preferred Experience: IoT platforms T...

    $35 / hr Average bid
    $35 / hr Avg Bid
    138 bids

    WE ARE BUILDING AN AUTONOMOUS AI FINTECH PLATFORM FOR DEBT MANAGEMENT. This is NOT a simple fintech app. This is NOT a basic AI wrapper. This is NOT a beginner project. We are building , an AI-native autonomous financial operating system designed to help people get out of debt with as little manual work as possible. The platform will use MULTIPLE AI AGENTS working together simultaneously like a real financial team operating on behalf of the user. The system will: • Aggregate loans, debt, invoices, creditors, and financial obligations • Connect with banking and financial systems • Use autonomous AI agents and advanced automations • Analyze financial risk continuously • Prioritize debts automatically • Create intelligent repayment strategies • Negotiate...

    $38939 Average bid
    $38939 Avg Bid
    196 bids

    Hiring: Python Backend Engineer (Remote | Contract) We are looking for a skilled Python Backend Engineer to build and scale robust backend systems. The ideal candidate should have strong experience in API development, system design, and working with scalable, high-performance applications. --- Role Details - Role: Python Backend Engineer - Experience: 4–8 Years - Location: Remote - Engagement: Contract / Freelance - Compensation: ₹50,000 – ₹80,000/month (based on experience) - Note: This is a freelance role; PF benefits are not applicable --- Job Overview You will be responsible for developing backend services, APIs, and scalable systems that power web and data-driven applications. The role involves working closely with frontend, product, and DevOps teams to deliver high...

    $580 Average bid
    $580 Avg Bid
    68 bids

    Title: Gen AI Expert Needed for Online Job Support (Weekdays – Remote) Description: We are looking for an experienced professional to provide online job support for a client working on Gen AI-related projects. Requirement Details: Remote online support 5 to 6 hours daily Weekdays only (Monday to Friday) Monthly payout: ₹50,000 Long-term opportunity for the right candidate Preferred Skills: Gen AI / AI application support Python & FastAPI REST APIs & Backend Development Cloud Platforms (GCP preferred) Docker / Kubernetes CI/CD pipelines SaaS & Microservices knowledge Candidate Profile: Looking for someone with strong backend and cloud experience who can assist in development, issue fixing, deployments, and technical guidance during client working hours. Important Te...

    $301 Average bid
    $301 Avg Bid
    29 bids
    Full-Stack/LLM Development
    3 days left
    Verified

    I’m replacing our summary-based workflow with a true Retrieval-Augmented Generation pipeline and need a collaborator who can own both the backend and the React front end. The core objective is accuracy: every PDF we receive from clients must be chunked, embedded, stored in Qdrant, and then retrieved at query time so the language model can cite exact passages, never a lossy summary. You’ll wire this flow together with Python services and Node/Fastify APIs, expose it to the UI in Typescript/React, and keep everything humming inside our OpenAI-powered evaluation layer. What I’ll lean on you for • Architecting and implementing the end-to-end RAG pipeline (chunking strategy, embedding jobs, vector-store schema, retrieval functions). • Building real-time docum...

    $18 / hr Average bid
    $18 / hr Avg Bid
    278 bids

    Project: Algo Trading Platform Document Purpose: This file summarizes the current software features, the enhancements already added during recent development, missing capabilities, and recommended add-on improvements to complete the application into a more polished trading platform. 1. Current Core Features - Modular Python trading architecture with separate modules for broker integration, data fetching, backtesting, portfolio management, and strategy execution. - Dhan broker support via `src/broker/` and optional yfinance fallback in `src/data/`. - Multiple strategy implementations including moving average crossover, RSI, Bollinger Bands, and various option strategies. - Portfolio manager and risk manager modules for tracking positions and enforcing risk rules. - Backtesting engine i...

    $562 Average bid
    $562 Avg Bid
    46 bids

    Title: Gen AI Expert Needed for Online Job Support (Weekdays – Remote) Description: We are looking for an experienced professional to provide online job support for a client working on Gen AI-related projects. Requirement Details: Remote online support 5 to 6 hours daily Weekdays only (Monday to Friday) Monthly payout: ₹50,000 Long-term opportunity for the right candidate Preferred Skills: Gen AI / AI application support Python & FastAPI REST APIs & Backend Development Cloud Platforms (GCP preferred) Docker / Kubernetes CI/CD pipelines SaaS & Microservices knowledge Candidate Profile: Looking for someone with strong backend and cloud experience who can assist in development, issue fixing, deployments, and technical guidance during client working hours. Important T...

    $545 Average bid
    $545 Avg Bid
    32 bids

    Role Overview We are looking for an Agentic AI Developer whose primary responsibility is to build intelligent agents that can analyze KPI and raw data to generate insights, detect anomalies, and perform root cause analysis. Experience: 2–5 Years Location: Remote (India) Key Responsibilities • Design and develop intelligent agents that can analyze KPI data and raw datasets to generate actionable insights • Build agent workflows that: • Identify trends, patterns, and anomalies, provide root cause analysis for KPI changes • Develop query systems that allow users to: • Ask questions, Retrieve insights in natural language, Drill down into data • Implement RAG pipelines to: • Retrieve relevant data (KPI definitions, historical data, documents) • I...

    $587 Average bid
    $587 Avg Bid
    82 bids

    We need an experienced AI agent engineer to build a focused MVP foundation for a production-oriented AI agent. The goal is not to build a full enterprise agent platform, but to create a clean working structure that can be extended safely in later phases. Exact Deliverables 1. Working AI agent API endpoint o Python backend, preferably FastAPI o API-first structure o Accepts user input and returns an LLM-generated response o Clear request/response format 2. Basic LLM orchestration o OpenAI, Anthropic, or similar LLM API integration o Configurable system prompt / instruction layer o Simple agent workflow logic o Basic tool/function structure if required 3. PostgreSQL logging o Store request, response, timestamp, status, and errors o Simple database schema o Setup or migration script included ...

    $61 / hr Average bid
    $61 / hr Avg Bid
    166 bids

    Python Developer – Smart Home State Machine (FastAPI / asyncio) We are building CalmOS, a local-first smart home system on FastAPI (Python). We need a developer to implement the state machine — the brain that coordinates all subsystems simultaneously. CalmOS thinks in states, not devices. Each state defines what lighting, audio, climate, ventilation, socket...

    $27 / hr Average bid
    $27 / hr Avg Bid
    182 bids

    Python Developer – Smart Home Security & Alarm Logic (FastAPI / asyncio) We are building CalmOS, a premium local-first smart home system running on FastAPI (Python). We need a developer to implement the full security and alarm logic. All processing is on-device — no images or audio leave the system. Testable locally with a webcam, no on-site hardware required. --- ALARM TYPES (5): - Intrusion: camera + microphone detection, different behavior when resident is home vs. away - Fire/Smoke: shut down AC + KWL immediately (no oxygen feed), activate escape route lighting - CO (Carbon Monoxide): separate from CO₂ — ventilation to maximum - Medical Emergency: person down → voice check → contact person called → auto ambulance ALARM LEVELS (3): ...

    $22 / hr Average bid
    $22 / hr Avg Bid
    144 bids

    Enterprise Codebase Requirement Specification (50K+ LOC) Objective We are looking to source or generate a realistic enterprise-grade software codebase suitable for: Engineering capability evaluation AI code analysis benchmarking Architecture review exercises Enterprise software demonstrations Technical due diligence simulations The repository must resemble a real-world production engineering system with meaningful architectural depth, realistic module separation, and supporting SDLC artifacts. 1. Core Repository Requirements Minimum Codebase Size Total Lines of Code (LOC): 50,000+ Source LOC: 35,000+ Test LOC: 8,000+ Number of Files: 400+ Modules/Packages: 10+ Avoid artificially inflated LOC through: generated code vendor libraries minified assets duplicated files dummy filler classes 2. T...

    $276 Average bid
    $276 Avg Bid
    44 bids

    Pearson PTE Enterprise Integration: Automated Registration, Seat Booking, & Multi-Tier Agent VMS Project Overview We are building an end-to-end PTE (Pearson Test of English) concierge platform. The system must manage the entire student lifecycle: from Agent-led lead generation and coupon-based payment bypass to headless account creation and real-time exam seat booking via the Pearson VUE B2B API. Detailed Scope of Work Module 1: The Intelligent Enrollment Gateway When a student initiates a booking (either directly or via an Agent's coupon), the system must branch based on their existing status: Discovery Step: Prompt: "Do you already have a PTE ID?" Path A (New User): Full headless registration flow. Capture PII -> Push to Pearson API -> Handle Verification Webh...

    $1363 Average bid
    $1363 Avg Bid
    44 bids

    Overview The software is an intelligent classroom seating and student management system designed to digitally organise classroom seating arrangements, automate seat rotation, and provide instant access to student information through an interactive classroom layout. The platform allows administrators, teachers, or faculty coordinators to create multiple classes/courses, assign students to seats, automatically rotate seating positions weekly, and access detailed student profiles simply by clicking on a seat or student. The system is designed to improve classroom management, fairness in seating allocation, attendance tracking, and student monitoring while providing a clean and visual interface. Core Objectives Digitise classroom seating arrangements Automate weekly seat rotation Provide quick...

    $396 Average bid
    $396 Avg Bid
    59 bids

    I’m building a web-based application whose core feature is an integrated AI model, and I need an experienced developer to take it from concept to a working, user-friendly product. The project is entirely software-focused; there’s no network or security audit component—just solid, clean code that brings the AI functionality to life in a browser. Here’s the picture: the AI model will handle the heavy lifting on the backend, returning predictions or generated content, while the frontend presents results in a modern, responsive interface. I already have high-level flow diagrams and a shortlist of preferred tools, but I’m open to your suggestions if they achieve faster iteration and reliable scaling. Your deliverable is a fully deployable web application: • ...

    $25 Average bid
    $25 Avg Bid
    28 bids

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