Available for new projects

Senior Software Engineer

Shipping backend-heavySaaS products.

Software engineer focused on production-ready web products, APIs and AI-enabled systems — from database to deployment.

Working with

Python
Django
FastAPI
React
Next.js

Get in touch

Trusted to build & ship for teams of every size

LOGO

Stack & expertise

The toolkit behind the products

Backend-first, full-stack capable. I pick boring, proven tools and make them ship outcomes.

Backend

Python
Django
FastAPI
Celery
PostgreSQL
Redis

Frontend

React
Next.js
TypeScript
Tailwind CSS

Infra & DevEx

Docker
Vercel
AWS
GitHub Actions
CI/CD

Engineering

System design
REST & APIs
Auth / JWT
Stripe
Testing
Observability

About

Python product engineer who can ship across the stack.

I design and build production-ready web products — the kind that handle real users, real money and real data. My home is the backend: clean APIs, solid data models, background jobs and auth that doesn't leak.

But I ship outcomes, not just endpoints. I'm comfortable taking a SaaS idea from an empty repo to a deployed product — backend, frontend, billing and infrastructure included.

Services

How I can help

Engagements built around shipping software outcomes — not billing hours.

Backend systems

APIs, data models, background jobs and the unglamorous plumbing that keeps a product reliable at scale.

SaaS development

From empty repo to deployed product: auth, billing, multi-tenancy, admin panels and the full delivery loop.

API design

Versioned, documented, well-tested REST APIs that frontend teams and integrations actually enjoy using.

AI product engineering

LLM-enabled features and document workflows wired into real products — pragmatic, evaluated, in production.

Technical consulting

Architecture reviews, stack decisions and pragmatic guidance for teams scaling a Python codebase.

Selected work

A few things I've built

Project teardowns: the problem, the stack and the outcome.

AI document workflow app

Multi-step document processing with an LLM pipeline, queued workers and a React dashboard.

FastAPI
Celery
React
Postgres

From prototype to paying users

Multi-tenant SaaS platform

Tenant isolation, role-based access and Stripe billing on a single maintainable Django codebase.

Django
Postgres
Stripe
Redis

Single codebase, many tenants

Internal API platform

Versioned API gateway with auth, rate limiting and auto-generated OpenAPI docs.

FastAPI
Docker
AWS
CI/CD

Self-serve for product teams

See more on GitHub

Writing

Notes from production

Production thinking on Python, SaaS architecture and AI-assisted engineering.

python2026

Contact

Let's build something worth shipping.

Got a backend-heavy product, an API that needs taming, or a SaaS idea stuck at the repo stage? Drop me a line.

Write to me

hi@krystianjarmul.dev

or find me on