👋 Sebastian Pravda

Full-stack developer from Prague, Czech republic 🇨🇿

$ whoami
Sebastian Pravda — full-stack developer

$ cat /proc/self/stack
typescript · go · rust

$ sudo make coffee
make: *** No rule to make target 'coffee'.  Stop.

$ ls ~/now
flagfish/     one Go binary, provable anti-cheat
posel/        native API client — your requests are files

$ _

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🔭 Currently building

🐟 flagfish

Self-hosted CTF platform in one Go binary — race-free scoring, a rewindable scoreboard, and anti-cheat that catches flag sharing.

📮 posel

Fast, GPUI-based native API client for REST, GraphQL & tRPC. Requests are plain files you commit to git — no Electron, no account, no cloud. Built in Rust.

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🧰 Stack

Daily
Server
Client
Infra
Proof

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📦 Also on here

• duchchess — negamax UCI chess engine in Java, ~2000 ELO.
• Portfolio — encrypted school admissions system (Rust, SvelteKit).
• Testy — xlsx-compatible testing system (SvelteKit).
• chesslink — multiplayer chess over a short link. Next.js, WebSockets, zero signup.