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$
USD
I will build a fastapi rest API and integrate your systems
Angel Rosario
About this gig
Need a clear, maintainable Python backend for an application or internal tool? I will build a scoped FastAPI REST API or connect your system to a documented third-party API.
Depending on the package, your project can include request and response validation with Pydantic, CRUD endpoints, SQLAlchemy models, SQLite persistence, Alembic migrations, external API calls, scheduled jobs, structured error handling, logging, automated tests, and OpenAPI documentation.
You will receive the agreed source code, setup instructions, endpoint documentation, and tested example requests. I design around explicit data contracts and predictable failure behavior so the next developer can understand and maintain the project.
Please contact me before ordering. The number of endpoints alone does not determine complexity; authentication, external services, data rules, rate limits, and deployment requirements must be reviewed first. Never send passwords, API keys, or production secrets in the initial message.
Get to know Angel Rosario
Angel Rosario
Python Backend and Automation Developer
- FromDominican Republic
- Member sinceAug 2026
Languages
Spanish, English
Hi, I’m Angel, a Python backend and automation developer. I build practical tools that reduce repetitive work, connect APIs, process business data, and create clear internal dashboards. My core stack includes Python, FastAPI, REST APIs, SQLAlchemy, SQLite, React, and TypeScript. I value maintainable code, validation, testing, documentation, and dependable communication. I also provide English-language technical support. View my portfolio: https://angel-rosario-portfolio.pages.dev/
Other Software Development Services I Offer
FAQ
Do you provide Swagger or OpenAPI documentation?
Yes. FastAPI generates the base OpenAPI documentation, and I will document the agreed endpoints and setup process.
Can you use my existing database?
Possibly. I need to review the database type, schema, migration constraints, and a sanitized sample before confirming scope.
Is authentication included?
Basic includes no authentication. Premium may include one agreed authentication approach after the requirements and security expectations are reviewed.
Can you integrate any API?
I can work with documented APIs that the client is authorized to use. Undocumented, unstable, restricted, or high-risk integrations require review and may be declined.
What is not included or considered a revision?
Deployment is not included by default. A revision adjusts agreed behavior; new endpoints, integrations, schema redesigns, business-rule changes, or server setup require a separate quote.
