High-throughput APIs, fault-tolerant architectures, and AI speech platforms.
Adaptive English platform serving 700+ active learners with automated testing and speech scoring.
Architected ASP.NET Core REST APIs with PostgreSQL and Redis caching for 700+ active users.
Eliminated placement-test dropouts by correcting false anti-cheat triggers and enabling session recovery (+78% onboarding).
Engineered MD5-hashed Redis audio caching for Azure Speech, reducing synthesis costs by 35% and latency to <120ms.
Social reading platform with algorithmic feed, SignalR chat, and Telegram Mini App integration.
Built full-stack platform (.NET 8, PostgreSQL) with reviews, goals, quotes, and real-time SignalR chat.
Integrated Telegram Mini App with automated quote broadcasts, HMAC-SHA256 validation, and 2-minute OTP auth.
Engineered 60/40 discovery feed with cursor pagination and a 4-route fallback proxy (99.8% availability).
Autonomous multimodal Telegram assistant with voice interaction, OCR vision, and channel auto-enrichment.
Developed multimodal Telegram bot (.NET 8, EF Core, Docker) with Whisper STT, TTS, and OCR document processing.
Engineered autonomous channel enrichment for generating discussion starters, summaries, and educational quizzes.
Built dual-key failover gateway with tiered timeouts (30s/65s) and deduplication, maintaining 99.9% uptime.
Real-time multiplayer typing duel engine with sub-50ms synchronization and anti-cheat validation.
Designed room-based matchmaking using SignalR hubs and Redis Pub/Sub state distribution.
Implemented server-authoritative keystroke timestamps to eliminate network latency manipulation.
Built low-latency WebSocket lobbies supporting concurrent 1v1 and battle-royale typing bouts.
Productivity tracker comparing planned tasks with deep-work sessions across timezones.
Built productivity backend (.NET 8, PostgreSQL) delivering timezone-aware analytics for 200+ users.
Automated timer completion and distraction logging with Hangfire background jobs (100% data integrity).
Verified technical competency and communication abilities.
