Aaron C.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Nov 5, 2026.

I spent the last 5 years as a full-time frontend engineer at Ontop (a US fintech), building their design system and the KYC onboarding flows used by thousands of users. I'm back to freelancing full-time — my Upwork history is short because I was employed, not because I stopped shipping. What I do: • Angular architecture (v8 to v21): Signals, standalone components, lazy loading, feature-based structure • Design systems & component libraries: design tokens, consistent APIs — Angular Material, PrimeNG, Storybook • Web performance: Core Web Vitals audits, OnPush change detection, bundle optimization — 30% cut in initial load time on a production fintech platform • Angular version upgrades — I've personally migrated apps across 6+ major versions • React 18 + Supabase — two SaaS products shipped solo, from architecture to launch Recent, verifiable work: I built and launched Ourmemory, Snappy and Waveless on my own — architecture to production. Links in the Portfolio section below. How I work: - Short iterations, PR-first, weekly demos, clear acceptance criteria - Before/after metrics and documentation on handover - Based in Madrid (CET): full overlap with EU teams, morning overlap with US East Coast - Native Spanish — I work with teams in Spain and LatAm in their own language