Vrezh Sargsyan

Led front-end modernization from legacy Angular versions to Angular 20. Reduced Sentry-tracked error rate from 8.0% to 4.8% (~40% relative reduction). Improved load time from 4.2s to 2.5s through RxJS/state handling improvements, lazy loading, and Lighthouse-guided optimization. Defined architecture and coding standards, owned the front-end migration strategy, mentored three junior developers, and created documentation that reduced onboarding from three weeks to one week. Used Claude Code and OpenAI Codex in human-reviewed workflows for repository analysis, migration planning, targeted refactoring of deprecated patterns, test generation, debugging, and documentation support; validated changes via builds, automated checks, code reviews, Sentry, Lighthouse, and Google Analytics.

Migrated a multi-page enterprise application to a modular Angular SPA, reducing initial bundle size by 60% via lazy-loaded feature modules and ahead-of-time compilation. Redesigned front-end architecture and SPA flows, increasing daily active users from 12,000 to 15,000 (~25%) measured with Google Analytics. Introduced lazy loading and code splitting to cut initial load time by 50% while improving API integration and data-loading patterns. Built modular routing and reusable page structures and created deployment runbooks that reduced incident-resolution time by 30%.

Designed a hybrid architecture that maintained 100% uptime during a live production transition to Angular. Built reusable UI libraries that shortened feature development cycles by 35% and improved consistency across the application. Led code audits, testing, documentation, and internal training, reducing critical post-migration bugs and accelerating onboarding.