kanatev

Built a full-stack application for learning foreign vocabulary (flashcards, audio, images) with Telegram Mini App integration. Frontend: React 19 / TypeScript / Vite / MUI 7 with support for 8 languages (i18next), a custom procedurally generated lesson map (SVG paths, Framer Motion), dark theme, and offline state persistence. Backend: Express 5 / TypeScript / MySQL with PASETO authentication (access token in header, refresh token in HttpOnly cookie), a content model of sections to chapters to waypoints, and a system for progress tracking, roles, and content visibility. Implemented payments via Telegram Stars (invoice flow, webhooks, idempotent transaction recording, refund flow), an in-game soft currency with daily accrual, and a Telegram bot (Telegraf) with localized commands and bulk messaging. Owned the full cycle from database schema and API design to UI, animations, and VPS deployment.

Developed and shipped Unity mobile games (2D/3D, Android and iOS) from prototype to live releases on Google Play and the App Store, owning gameplay, monetization, analytics and release process. Built core systems in C# with component-based, event-driven architecture, state machines, ScriptableObject configs, object pooling and save/load, plus UI (uGUI/TextMesh Pro), animation (Animator, DOTween), VFX and shaders (URP, Shader Graph), Addressables, Cinemachine and the new Input System. Profiled and optimized performance, memory and build size, and fixed Android-specific issues such as frame pacing, refresh-rate handling and resume stutter, debugging on device via adb/logcat. Integrated third-party SDKs and native plugins: AdMob, Appodeal and AppLovin MAX mediation (banner, interstitial, rewarded video with a rewarded revive flow), Unity IAP, Facebook SDK, devtodev and Firebase (Analytics/GA4, Crashlytics, Remote Config), designing custom event taxonomies and funnels for product decisions. Handled GDPR consent (UMP, Consent Mode, custom consent screen) and iOS ATT, store compliance (Data Safety, privacy policy and nutrition labels), target API upgrades, R8, Gradle/manifest setup, app signing, AAB builds, TestFlight and staged rollouts across testing and production tracks. Wrote editor tooling, covered logic with unit tests, and worked in Git with code review and CI alongside designers, artists and QA.