System Design Interview An Insider's Guide
by Alex Xu
Software engineer, frontend-leaning full-stack. 4+ years building B2B platforms used by tens of thousands of operators across logistics, CRM, CX, and fleet safety.
Currently at Nauto (Series C, AI fleet safety), shipping the customer-facing platform used by fleet, safety, and operations teams across 500k+ drivers. Before Nauto, 3 years at Mercado Libre's CX IT org helping build a next-gen CRM now used by 25k+ agents handling 5M+ monthly customer interactions. Earlier at Envíopack, I shipped a B2B WMS, redesigned core warehouse workflows (30% faster operator task time), and took test coverage from 0 to 90%.
Looking for a US AI-native startup (Series A–C) building agentic tools for power users or developers. Based in Buenos Aires, full overlap with US time zones, open to remote or relocation.
TypeScript - React - Next.js - Tailwind - shadcn - React Query - Node.js - PostgreSQL
Read the Bible from your terminal — TUI + CLI in one binary, built with Bun, TypeScript, OpenTUI, and Hexagonal Architecture.
My personal web
Chiptune notification sounds for Claude Code — eight 8-bit cues that fire when Claude needs your attention.
B2B platforms - Power-user tools - Agentic AI - Developer experience
by Alex Xu
by John Ousterhout