Olena Hrymaliuk

9 years on a mission-critical US healthcare platform — 65,000+ practitioners, 9.5 million insurance claims processed monthly, WCAG 2.1 AA compliance non-negotiable throughout. That scale teaches things no side project can: zero-downtime releases, performance under real load, and interfaces that have to work for clinicians under genuine pressure. I understand not just how to build features, but how to build systems that survive years of changing requirements and a domain where getting it wrong has real consequences.

My stack runs from semantic HTML and CSS to Angular, NgRx, Signals, Nx monorepos, and microfrontend architecture — built and owned at enterprise scale. I hold a Ph.D. in Mathematics (Functional Analysis), which shapes how I model complex domain logic and reason about correctness. I've also mentored engineers at an Angular academy, running the full curriculum from fundamentals to production-grade architecture.

This portfolio pushed me deliberately beyond frontend. I designed and shipped it entirely myself: Angular 21 frontend, Python + FastAPI backend, RAG pipeline on OpenAI embeddings + pgvector + Claude — and the AI assistant you can talk to right now. Frontend is my core. I go as far across the stack as the problem requires.