Go · REST APIschi router, pgx, PostgreSQL, session auth with CSRF, rate limiting, SQL migrations in CI.
React 19 · TypeScriptVite + TypeScript monorepo, design-token CSS, full RTL, installable PWA, i18n in 3 languages.
AI integrationOpenAI Responses API, tutoring with citations from user uploads, structured extraction, graceful fallbacks.
DevOpsOracle Cloud VPS, Caddy auto-TLS, GitHub Actions CI, scripted one-command deploys, Linux administration.
Security & GDPRCookie sessions, CSRF, rate limits, self-service account deletion, EU hosting.
Product & QAPlaywright E2E suites, CI-gated releases, building from real user feedback.