Senior Software Engineer at Pixel Pioneers

High-load sweepstakes gaming platform with real-money-like transaction flows (tens of thousands of daily users; terabytes of transactional data; ~15 engineers). Owned end-to-end integration of a new payment provider (cards, bank transfers, crypto), which became the primary production payment solution. Designed and implemented backend architecture for checkout & payouts with a secure transaction handling approach (no sensitive data stored internally) and provider abstraction. Built a competition/leaderboard system from scratch including scoring, ranking, scheduled resets (cron-based), and winner determination. Co-designed a cross-domain scheduling system to automate updates across promotions, bonuses, content, and game configs, reducing manual operations for product/marketing teams. Resolved event store consistency issues in an event-sourced system to improve reliability of domain state. Integrated external systems across payments, KYC providers, and game providers.

Node.js Developer at UseVerb | Video-based recruitment platform

Developed and maintained backend APIs for web and mobile clients using AWS (Lambda, S3) and Node.js/TypeScript. Built a custom stress-testing framework with configurable load scenarios and API simulation executed via AWS Lambda. Improved the build/deployment pipeline by reducing bundle size from 1.5GB to 0.4GB (4x reduction), enabling faster deployments and better cloud efficiency.

Freelance Backend Engineer at Freelance

Worked directly with clients across multiple domains to design and build backend systems for mobile and web applications. Conducted technical discussions covering architecture decisions and implementation planning. Delivered projects including: healthcare system integrations with a system-to-system API/data exchange layer; AI-powered applications integrating OpenAI; a Web3 automation bot for data analysis and automated transactions.

Full-stack Developer at Vkussnoff | Recipe platform

Recipe platform supporting several thousand daily users. Implemented an Elasticsearch-based search system from scratch to improve content discovery and usability. Delivered end-to-end features with backend focus (.NET) plus supporting frontend implementation.

Software Developer at IT Summa

Enterprise outsourcing work contributing to high-load systems for large clients. Gained full-stack experience across PHP/Laravel/JavaScript and frontend technologies, including Docker-based workflows.