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I will build python fastapi backends and rest API integrations
Hasnain Shafiq
About this gig
Need a Python backend that your app and business tools can rely on?
I will build FastAPI REST endpoints and connect external APIs with clear data contracts, validation and documentation.
My experience includes a Dockerized invoice parser with FastAPI, schema validation, Swagger documentation and automated tests, plus API workflows supporting 300+ weekly orders. I have also built B2B software with React, TypeScript and Cloudflare.
Every package includes:
- Python source code with useful comments
- Request/response validation and error responses
- Swagger/OpenAPI documentation
- Tests for the agreed endpoint behavior
- Setup instructions
Standard adds PostgreSQL, one external API, token-based authentication and Docker. Premium expands the scope and includes deployment to one agreed compatible environment.
An endpoint means one route and HTTP method. Packages exclude frontend design, third-party fees, ongoing hosting and unlimited changes. Complex authentication, migrations or unusual APIs require a custom quote.
Message me with your API specification, sample payloads and deployment target so we can agree on scope before ordering.
Get to know Hasnain Shafiq
Hasnain Shafiq
AI Automation Engineer, n8n, Python, FastAPI and RAG
- FromPakistan
- Member sinceJan 2022
- Avg. response time1 hour
Languages
English, German
I help businesses automate manual work and turn documents into usable data. I build n8n workflows, Python/FastAPI backends, API integrations, AI invoice extraction and RAG assistants. My work includes fulfillment automation for 300+ weekly orders, cutting preparation from 2-3 hours to 5-10 minutes, and invoice extraction achieving 95%+ accuracy on a past project. I work with PostgreSQL, Docker, Make and Zapier, with testing and clear handover documentation. Send me your workflow, tools and desired outcome to discuss a practical solution.
Other Software Development Services I Offer
FAQ
What counts as an endpoint?
One route and HTTP method, such as GET /orders or POST /orders. Each counts separately. We agree on request fields, responses, business rules and test cases before work begins.
Can you integrate an existing API?
Yes. Share its documentation, authentication method and sample payloads. Standard includes 1 external API and Premium includes 2 within the endpoint limits. Unusual authentication or undocumented APIs need a scope review.
Are deployment and hosting included?
Premium includes deployment to one agreed compatible environment. You provide authorized access and pay hosting, database and third-party service fees. Standard includes Docker files and setup instructions.
Do you build the frontend too?
These packages cover backend/API work. React and TypeScript are in my skill set, but a new frontend, dashboard or customer portal is separate scope. Send details for a tailored offer.
What do revisions cover?
Revisions adjust the delivered backend within the agreed specification. New endpoints, integrations, database features or business rules are additional scope. Basic has 1 revision; Standard and Premium have 2.
