Jan Koriťák

Aviation training platform, greenfield rebuild — tech lead. Built a custom agentic delivery pipeline: stack-tuned Claude Code skills turn specs into code, contract-first APIs keep React web, Expo mobile, and Django backend from drifting, automated review and generated tests gate each change, and Sentry errors feed an agent that root-causes and opens fix PRs — five engineers shipping at the velocity of more. Owned end-to-end delivery including a live production tenant migration off v1, with tenant isolation via PostgreSQL row-level security.

Voice agent SaaS for B2B hospitality — owned greenfield to production. Next.js dashboard, Python FastAPI voice agent on Deepgram + GPT-5, Expo mobile, Supabase + Stripe. When vendor-side model drift regressed the agent in production, designed and executed a self-improvement loop on Karpathy's autoresearch pattern — restoring intent accuracy and cutting end-to-end latency 5.2s → 1.2s. Deep dive.

Four years building the frontend of an enterprise observability platform across three teams (Alerting, Platform, Database Observability; post-VividCortex acquisition). Co-authored the alerting engine and a configurable-dashboards framework adopted as the platform standard across every product module. Stepped off in 2025 to go all-in on AI product work.

Hiring platform matching engineers with companies by open-source contribution scoring. Shipped, onboarded first users, never found PMF. Folded.

Built the management & observability portal for Hazelcast's in-memory data grid — cluster monitoring, config, and diagnostics for a customer base of banks and telcos. Delivered as an incremental jQuery → typed React migration: TDD, module-by-module, zero production disruption. Co-authored Hive, the open-source design system.

License-scanning SaaS — open-source scanner for npm, pip, Maven dependencies plus a SaaS on top. Couldn't raise when COVID hit. Folded.

Real-time cycling performance tracker — native mobile app with BLE hardware integration for Swiss cycling electronics maker. Early React Native + BLE when neither was stable. Designed the stack, shipped greenfield with a small team.

Frontend of the alerting module at a Nordic media intelligence platform — real-time brand and topic alerts to PR and communications teams.

Seat-selection module for one of Europe's largest online travel agencies. Cabin layouts rendered as SVG per aircraft, seat-level pricing, integrated into the existing checkout.

Event platform — full-stack features across web and React Native mobile, team of two, Firebase data layer.

Brno University of Technology.

An eval harness plus an autonomous Claude Code loop to restore intent accuracy and cut latency 5.2s → 1.2s. Deep dive at blog.jankoritak.com.

Comparison of RSC with SSR/SSG/ISR. Featured in This Week In React by Sebastien Lorber.

Co-hosted SolarWinds + senvio meetup in Brno. Presented React Server Components shortly after their release.

Post to X from inside Claude Code — open-source, BYOK, write-only plugin. Draft from your session, review, approve, post.

Interactive prompt-injection attack — instructions hidden in markdown override the system prompt and exfiltrate context through image requests.

Eval harness for a production Deepgram voice agent — intent accuracy and end-to-end latency across multi-turn conversations.

Self-hosted, sandboxed agent running my calendar, planning, knowledge base, and smart-home automation.

Autonomous prediction-market trading — sports copy-trading and weather arbitrage.