Senior Full-Stack Developer · Warsaw, Poland · 10+ years Performance engineering · AI integration · Edge computing · Web3

PageSpeed 100/100 Desktop · 95.6 Mobile · CLS 0.000 on a real-time SSR DEX explorer running on Cloudflare Workers. Wrote it up in The Road to PageSpeed 100 — a 3-part Medium series.

• DexPaprika — Vue 3 → Nuxt 4 SSR migration on Cloudflare Workers. Owned the 8-phase PageSpeed program, Bootstrap → Tailwind v4 refactor (53% CSS reduction), 3-tier stale-while-revalidate cache with critical-CSS injection, and the visual + mobile UX rewrite (thumb-bar nav, swipe gestures, refactored right-drawer split into design-token components).

• GetName.pl — Premium .pl domain marketplace on Nuxt 4. Full NASK EPP registry integration, Solidity smart contracts on Polygon (GNRegistry, GNMarketplace, GNToken ERC-20, NFT domains), AI domain assistant (OpenAI), real-time auctions with anti-snipe, multi-payment (Stripe / Przelewy24 / crypto), SIWE auth, 40+ tables on PostgreSQL with Drizzle ORM and Better Auth.

• CoinPaprika — Architecting the Next.js 15+ migration on Cloudflare Workers via OpenNext (Turbo monorepo, modular api-client / i18n / types / ui packages). Shipped the official PHP SDK v1.5 and @coinpaprika/api-nodejs-client v3.0.0 (21 new endpoints, native fetch, dual CJS/ESM, AbortSignal cancellation).

• Multiple Next.js 15 + PayloadCMS sites on Cloudflare D1/R2 — DOMAR business platform (Claude API content pipeline, 120+ automated SEO scripts), LeoKlima HVAC (PL/EN/UA, Cloudflare Turnstile, lead-gen, JSON-LD), hob.com.pl roofing (Astro → Next.js 15, OpenAI, Framer Motion, next-intl).

• nask-epp-client — Node.js client for the NASK EPP protocol (.pl domain registry).
• browser-curl — Bypass WAF 403s by mimicking Chrome 145 headers. MIT.
• parallel-requests — Claude Code skill: detects sequential independent HTTP calls and refactors to parallel execution (Promise.all / asyncio.gather + 7 more languages).
• @coinpaprika/api-nodejs-client v3 & CoinPaprika PHP SDK v1.5 — full API coverage, dual CJS/ESM, integration tests, GitHub Actions CI.

Languages

Frontend

Backend

Edge & Cloud

Databases & ORM

AI & Web3

Tooling

• Conferences attended: NuxtNation 2022 & 2024 · Vue.js Nation 2023 & 2025 · ViteConf 2024 · Vue.js DE 2024
• The Road to PageSpeed 100 — 3-part Medium series on going from 85 → 100 on a real-time data app (CoinPaprika):
  • Part 1: Foundation & Server-Side Wins (85→90)
  • Part 2: Critical Rendering & CLS Battle (90→97)
  • The Final Push: How We Hit PageSpeed 100 on a Real-Time Data Application

• 📫 zagalski@protonmail.com
• 🔗 LinkedIn
• 🐙 github.com/zagi

2 dogs, 1 cat, an aquarium with snails. 3D printer humming. Sailing when there's wind. Free-living cat care volunteer in Warsaw since 2016.

If something I made helped you, you can ☕ buy me a coffee.