Re-architected Resource Management module using Domain-Driven Design, replacing rigid legacy system that blocked feature development and enabling previously impossible workforce management capabilities for clients

Optimized MongoDB queries for critical prediction API endpoint, achieving 20x performance improvement and significantly reducing response times for outage forecasting dashboard

Led deployment of complete production Kubernetes cluster for new client, working directly with stakeholders through daily reporting cycles while adapting backend services and coordinating with frontend developers under tight deadlines to deliver functional system despite incomplete requirements

Implemented subscription and payment logic enabling revenue generation, transitioning Kinjo from free platform to paid service model

Architected parent-child account linking system allowing parental oversight of children's Roblox educational activities, expanding addressable market

Optimized Roblox platform integration performance by implementing advanced Redis caching layer, reducing API response times and improving user experience during peak usage

Contributed to healthcare dialysis management platform serving thousands of patients across US.

Improved code quality and system stability through bug resolution and refactoring using SonarQube code analysis.

Developed Telegram bot for Ukrainian pharmacy enabling customers to check stock availability, locate nearby stores, and view promotional offers via conversational interface

Built admin dashboard for broadcasting announcements, managing product catalogs (text/images), and tracking user engagement metrics

Implemented automated daily synchronization with Google Sheets for real-time pharmacy location data updates across bot database