Location: Warsaw, Poland

Remote: Yes, remote only (CET)

Willing to relocate: No

Technologies: TypeScript, React, Next.js (App Router, RSC), Node, Bun, PostgreSQL, AWS, SST, Turborepo, WebSockets, WebGL. Web3: viem, wagmi, Ponder, Safe, Foundry

Résumé/CV: https://ciarka.pl/marcin_ciarka_cv.pdf

Email: yc_oct_job@plamka.net

Senior full-stack engineer, frontend-leaning, 9+ years. I build interfaces where a UI bug costs the user money.

Summer.fi, 2022 to 2026: took the Lazy Summer earn app from an empty repo to production as TVL approached $200M.

Most recently: contract advisor on a self-custodial DeFi app. Set up the monorepo, internal SDK and the indexer.

Before that: six years of banking and leasing front-ends in a regulated enterprise shop.

Things you can click: https://chainvi.be (sub-second, on-chain + off-chain enriched data, one server-side WebSocket fanned out to every client, component library under 6 kB gzipped) and https://resonance.summer.fi (live protocol activity as generative audio with WebGL).

Looking for: senior IC role on a B2B contract, available immediately. Crypto and DeFi are home turf, but I'm just as keen on any product team with hard frontend or full-stack problems, whether that's fintech, devtools or something else.