Sem Bozhyk

Implemented an AI chatbot that saved 2–4 hours daily per agent and built AI-powered property data processing and matching for a BENELUX market catalog of 100K+ properties, reducing data entry time by 40%.

Founded and scaled an e-commerce platform generating €250K annual revenue, integrated 5+ external APIs, achieved 99.9% uptime with zero-downtime deployments, and handled 10K+ monthly orders with sub-second responses.

Provided full-stack development, solution architecture, and technical consulting across e-commerce, fintech, trading, gambling and web3 domains, often overlapping with other engagements.

Led Vue 2 to Vue 3 migration, improving performance by 35% and reducing bundle size by 28%, and modernized a mapping app handling 50K+ daily venue searches while decreasing load time from 4.2s to 1.8s.

Led a team of 5 developers on payment systems processing €10M+ monthly, reduced payment failures by 23%, mentored juniors to boost velocity by 40%, and achieved 99.99% uptime for payment components.

Delivered three property management solutions with 500K+ monthly active users, improved performance by 50% through state management optimizations, and reduced bug reports by 35% via comprehensive testing.

Increased test coverage from 12% to 87% for a fintech startup, reduced production bugs by 65%, implemented CI/CD pipelines and cut deployment time from 2 hours to 15 minutes.

Maintained critical features serving 20M daily sessions with 99.95% uptime, optimized a photo editor to reduce memory usage by 60%, and built a tax reporting system processing $2M+ daily creator earnings.

Refactored legacy codebase to improve response times by 45%, reduced technical debt by 30%, and increased test coverage from 20% to 75% while enhancing API performance for 3x concurrent users.

Built PCI-compliant payment interfaces processing $5M+ monthly, achieved zero security incidents during implementation, and reduced payment processing time by 25% through API optimizations.