About

Python product engineer who can ship across the stack.

Backend-heavy by trade. Full-stack by necessity. Here's how I work and what I optimize for.

Krystian Jarmuł
Focus
Backend-heavy SaaS
Core
Python · Django · FastAPI
Frontend
React · Next.js
Based
Poland · Remote

What I do

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. I ship outcomes, not just endpoints.

How I work

I default to boring, proven tools and make them ship outcomes. I write tests where they pay back, observability where it matters, and documentation only when the future-reader is someone other than me. I push back on premature abstraction.

Where I help most

Greenfield SaaS work where the engineering decisions still matter. API-heavy systems where the contract is the product. Teams scaling a Python codebase past the point where the framework defaults are enough. AI-enabled features that need to be production-grade, not demos.

Outside the editor

Based in Poland, working remotely. When I'm not in code I'm usually outdoors, reading something non-technical, or stewarding the Manda brand that gives this site its character.