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Marcin Gol

Full-stack engineer · Lublin, Poland

I build product-facing web applications end to end — React and Next.js on the front, NestJS, GraphQL and Prisma behind them, on infrastructure I run myself. I work best alongside other people, and I leave codebases easier than I found them.

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Selected work

3 projects
The architektgol homepage: the practice name over the headline “Architektura zaczyna się od miejsca, nie od formy”, a row of practice statistics, and a line-drawn elevation of a house among trees.

architektgol

2026

A portfolio site for an architecture practice, built with a non-technical client and handed over so they run it themselves.

  • React
  • GatsbyJS
  • Vercel
  • SEO
The Huffman coding visualiser: a text input above a row of coders, the resulting compression statistics, and the codebook listing each symbol’s count, share, code and bit length.

Huffman coding visualiser

2026

An interactive teaching tool for compression. Type a phrase and the tree, the codebook and the bit counts rebuild as you type, with five other coders alongside Huffman to compare it against.

  • React
  • Algorithms
  • Vercel
The homepage of this portfolio site.

This site

2026

A deliberately small portfolio: no framework theatre, no megabytes of decoration.

  • Next.js
  • React
  • TypeScript
  • Tailwind CSS
  • Vercel

How I work

Team, tests, handover

  • Working in a team

    Most of what I have shipped was shipped with other people. I plan in the open, keep pull requests small enough to review properly, and treat a disagreement in review as cheaper than a disagreement in production.

  • Leading where it helps

    I take the lead when a piece of work needs someone to hold the shape of it — breaking it down, unblocking people, making the call when a decision is stuck — without needing the title to do it.

  • Testing what matters

    I write tests where the cost of being wrong is real — the hot paths, the edge cases someone will hit at 2am, the regressions that already bit us once. Tests are a design tool as much as a safety net: code that is painful to test is usually telling you something.

  • Leaving things easier

    I write down the decisions that are load-bearing and the ones that are easy to break, so the next person does not have to rediscover them. Reviews and pairing are where most of that gets passed on.

Stack

What I reach for
Front-end
React · Next.js · TypeScript · Tailwind CSS · GatsbyJS
Back-end
NestJS · Next.js · GraphQL · Prisma · Node.js
Data
PostgreSQL · MS SQL Server · MongoDB
Testing
Jest · Vitest · Testing Library · Playwright · Supertest · pglite · Integration & e2e · CI test gates
Infrastructure
Azure · AWS · Kubernetes · Docker · Cloud architecture · CI/CD · Vercel · Netlify

Contact

Email or GitHub

The fastest way to reach me is email. I read everything and reply to anything that isn’t a template.

golmarcin@gmail.comgithub.com/marcingol1