API design and documentation
Typed REST endpoints with generated OpenAPI documentation, so your web, mobile and partner clients all build against one clear contract.
SaaS & backend engineering
SaaS platforms and backends built to stay up
GBixels builds the backend of SaaS products: REST APIs, PostgreSQL data models, authentication, billing and background workers. We write them in Python with FastAPI and deploy them in containers with automated tests and CI/CD.
What you get
- API design
- PostgreSQL data models
- Job queues & workers
- Auth & billing
What's included
What SaaS & backend covers.
REST APIs, data models and background workers that hold up in production. Built in Python and FastAPI on PostgreSQL.
Data modelling and migrations
A PostgreSQL schema designed for the queries your product actually runs, with versioned migrations so changes ship safely.
Background jobs and queues
Slow work such as imports, AI generation, exports and emails runs in workers, so requests stay fast and failures can be retried.
Auth, roles and billing
Sign-up, sessions, password resets, role-based permissions and subscription billing wired into the product rather than bolted on.
What you receive
Every SaaS & backend engagement hands over working software and the material your team needs to run it.
- 01OpenAPI documentation
- 02Versioned database migrations
- 03Automated test suite
- 04Container images
- 05CI/CD pipeline
- 06Logging and error monitoring
Related work
SaaS & backend we have shipped.
Live projects where we did this work. Open one to read how it was built.
What is FastAPI and why do you use it?
FastAPI is a Python web framework for building APIs. We use it because it validates request and response data automatically, generates OpenAPI documentation from the code, and handles concurrent requests efficiently, which keeps the API fast and the docs accurate.
Can you take over an existing backend?
Yes. We start by reading the code and infrastructure and writing a short assessment of what it does, what is risky and what we would change, then agree the order of work with you before touching anything.
How do you handle security?
Secrets stay out of the repository, access is role-based, dependencies are updated on a schedule, and we use parameterised queries and validated inputs everywhere. We can also arrange an external review before launch.
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Need this for your product?
Tell us where the project stands and what it has to do. We will come back with questions, a plan and an honest estimate.