Celsius Emilio Aray Delpino 👋

Senior Frontend Engineer & Technical Lead with 8+ years of experience building scalable, performant, and accessible web and mobile applications. I specialize in React, Next.js (SSR/ISR/SSG), React Native, and TypeScript — with deep expertise in SaaS architectures, GraphQL, state management (Zustand, Redux), CI/CD pipelines, and observability practices. I've worked with clients across SaaS, Retail Tech, E-commerce, and EdTech sectors, including Pulzen.ai, Universidad de San Sebastián, Jumbo Supermarket Chain, Under Armour Chile, and StarBien. My current development approach is centered on AI-assisted spec-driven development. I use Claude Code as my development copilot: I write detailed technical specs before implementation and collaborate with AI to translate them into quality, production-ready code — achieving 60%+ performance improvements and 85%+ code coverage across projects. Although I hold a law degree, in 2016 I followed my true vocation in technology. That legal background gives me an unexpected advantage: the ability to write precise technical specifications, think through edge cases, and structure requirements rigorously — skills that are now key to AI-assisted development. I'm passionate about mentoring developers, building high-quality component systems, and delivering products that combine technical excellence with real business impact. Currently seeking remote opportunities with international teams building impactful, user-centric products.