Led frontend architecture and WCAG 2.2 AA accessibility strategy for two production fintech platforms (V2X Pay and Planium Pay), covering Internet Banking and Backoffice systems.

Architected a domain-driven NestJS banking backend (Pix, TED, onboarding, webhooks) with RabbitMQ async messaging, delivering critical modules 3 weeks ahead of schedule.

Led the Next.js 15 migration: reduced TTFB by 72% (1.8s to 0.5s), LCP by 62%, and initial bundle size by 67%, with 95% of pages loading under 1s in production.