Lucas Castro

Senior Frontend Engineer with 7+ years building scalable web applications at high-growth startups. Specialized in React, Vue, and TypeScript with proven impact: reduced build times by 80%, led component library adoption across 20+ engineers, and architected micro-frontend systems. Passionate about performance optimization, accessibility, and developer experience. Active open-source contributor.

Leading mobile development for automotive marketplace connecting vehicle owners with service providers

1. Architected React Native application from ground up with scalable component library and design system
2. Built complex features including real-time booking, payment processing, and geolocation-based service matching
3. Implemented end-to-end type safety with TypeScript and Supabase, reducing runtime errors by 90%

Core frontend engineer at design-as-a-service platform serving enterprise clients

1. Led Vue 2 to Vue 3 migration for 100K+ LOC codebase, reducing build time by 80%
2. Architected component library with 20+ accessible components
3. Implemented monitoring with Sentry and Hotjar to identify and fix critical UX issues
4. Managed AWS infrastructure (CloudFront, S3, Lambda) with 99.9% uptime
5. Reduced developer onboarding from 3 weeks to 3 days through improved documentation
6. Conducted technical interviews and built hiring framework for team growth

Frontend developer at ecommerce financing platform serving 70K+ sellers

1. Implemented micro-frontend architecture with Single-SPA, enabling independent deployments for 4+ teams
2. Migrated legacy jQuery application to Vue SPA, improving user engagement metrics
3. Built shared design system components across 4+ product lines
4. Optimized authentication flow, reducing login time by 65%
5. Automated CI/CD pipelines with Azure DevOps

Delivered web and mobile projects for SMBs across Brazil

1. Built React and Vue applications for 10+ businesses
2. Developed React Native apps with IAP and subscription monetization
3. Optimized performance for lower-end devices and limited connectivity

Completed intensive 12-month program covering product strategy, user research, and design systems