Sergey Baltutin

Developed a Chrome extension with Manifest V3, Cloudflare Workers, and D1 backend for licensing and billing. Implemented per-domain permissions and offline test suites.

Rebuilt a moving company website on Cloudflare Pages and implemented an AI concierge with Workers AI. Created an instant estimate feature using OSRM and Nominatim.

Developed a timer app with high firing accuracy and reduced battery consumption. Implemented custom UI components and notification systems.

Developed an Android app for AI summarization using Gemini API and Clean Architecture. Implemented streaming, model fallback, and subtitle pipeline with reverse-engineered APIs.

Built an LLM assistant for e-commerce on Telegram and VK with RAG and function calling. Orchestrated bots and CRM integrations via n8n, improving conversion and reducing support workload.

Developed automation core in C# against ArtStation APIs, handling Cloudflare and anti-bot measures. Managed a WordPress marketplace and achieved high search ranking.

Developed an e-commerce aggregator app with over 500k installs. Implemented resilient network layer, search, offline favorites, and localization.

Automated analytics across multiple ad platforms and implemented SQL fraud detection. Improved conversion rates and reduced reporting time.

Developed C# toolkit for LinkedIn lead generation automation, reducing manual work. Maintained web properties and integrated landing pages with CRM.

Designed a CPA advertising network with dashboards and real-time tracking. Implemented ad server with fraud protection and billing.

Developed an infinite video feed with custom LayoutManager and pre-fetching. Implemented memory management and media support.

Developed multithreaded C# parsers and ETL pipelines. Implemented auto-bidding via Yandex Direct API.

Developed full-cycle on LAMP stack and customized CMS platforms. Managed a network of 50+ sites.