John Kalyango

About

Frontend engineer who led end-to-end development of a React-based carbon credits data collection and analysis tool, focusing on scalable architecture and performance (code splitting, SWR caching, memoization, Lighthouse monitoring). Experienced building complex route-driven TypeScript wizards with Redux/Rematch state persistence, and refactoring legacy monolithic UI into reusable, tested, documented components while shipping deadline-driven features using feature flags and tight QA collaboration.

Experience

Education

Key Strengths

• Led end-to-end frontend architecture for a React product (carbon credits data collection/analysis tool)
• Performance optimization at scale (lazy loading, aggressive code splitting, caching with SWR, render optimization with memoization)
• Built and managed complex multi-step, route-driven TypeScript wizards with shared layouts and persisted state via Redux/Rematch
• Improved type safety for unpredictable API payloads by defining strict interfaces and using optional/generic typing patterns
• Refactored monolithic, tightly coupled UI into reusable components with added unit tests and documentation
• Shipped major features under tight deadlines using incremental development, QA coordination, feature flags, and user-feedback-driven iteration
• Cross-functional collaboration with product/design to resolve responsive layout issues (mobile scroll/layout fixes using flexbox and media queries)