Juani De los Santos
Software Engineer
I build fast, thoughtful web applications with React, Next.js and TypeScript. Currently at GeoActio, modernizing public transport ticketing in Spain, while building EstacionAR, a parking reservation platform for Argentina.
Before that I led AI engineering at Crombie's Center of Excellence and helped run Puma's e-commerce across five countries. My industrial engineering background shapes how I work: break the complex problem down, then ship the simple solution.
Experience
- Frontend Engineer · GeoActio2025 — NowPublic transport ticketing for Spain. Multi-brand theming and end-to-end purchase flows with Next.js.
- AI Lead Engineer · Crombie2025Led the Center of Excellence designing AI agents and workflows. Vercel AI SDK, AWS Bedrock, Langchain.
- Frontend Engineer · Crombie / Puma2023 — 2025Puma e-commerce in 5 markets. Cut LCP by 25% and bundle size by 20%.
- FullStack Developer · Crombie2022 — 2023Led a team of 4 building Crombie's site. React, Django, AWS with SST.
Projects
Stack
React·Next.js·TypeScript·React Native·Tailwind CSS·Node.js·tRPC·PostgreSQL·AWS·Vercel AI SDK·Langchain
Contact
Interested in working together, or just want to talk frontend and AI?