2021 · SaaS · Full Stack · Professional
Expanzo Dho r.s.o
Modernized Expanzo's web stack, improving Lighthouse performance scores from 62 to 94 and reducing bundle size by 45%. Enhanced access to 50+ Czech and international companies database.
Problem
Legacy applications had poor performance (Lighthouse 62), large bundle sizes, and slow server response times affecting user experience.
Solution
Migrated three legacy applications to Next.js, implemented Redis caching, optimized database queries, and built 86+ reusable UI components.
Stack
Impact
Performance
Lighthouse score improved from 62 to 94, bundle size reduced by 45%
Impact
40% reduction in server response times
Role
Full stack engineer - Led migration, performance optimization, and component library development
Challenges
Migrating legacy codebase without breaking existing functionality while improving performance metrics