Justin Lu

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What I'm focused on

A snapshot of where my time and attention are going right now.

Updated May 11, 2026Building Trace and finishing the school yearNansha, Guangzhou
Focus
  • iOS networking internals
  • Personal site polish
Building
  • Trace — native iOS network debugger
  • This site (folio)
Reading
  • Designing Data-Intensive Applications
  • The Pragmatic Programmer

This page is a snapshot of what I'm spending time on right now, in the spirit of nownownow.com.

Most of my hours land on Trace, a native iOS network debugger I'm building from the ground up — capturing HTTP(S), WebSocket, SSE, and QUIC/HTTP3 traffic with on-device TLS MITM. The hardest current problem is making per-flow stream reassembly cheap enough to keep the UI responsive on long-lived connections.

In between, I'm tightening this site, finishing the school term, and trying to read a chapter of something technical every night before bed.

If any of this overlaps with what you're doing, drop me a note.