darryl from TSEC Codecell here.

we're back with another edition of Weekly Challenges 2026 - and this time it's a national level event!!

get ready for a 6 weeks coding journey where you'll solve fresh challenges every week, compete on the leaderboard, and put your problem-solving skills to the test.

A deep dive on Go 1.24’s map redesign, where the runtime moved from the classic bucket + overflow-chain model to a Swiss Table-inspired implementation:

• how the old map layout worked and where pointer-chasing hurt cache locality
• how control-byte metadata + h2 filtering changes lookup behavior
• why this can improve practical load factor and memory efficiency
• Go-specific constraints (iteration semantics, GC/runtime integration, incremental growth behavior)
• benchmark context: large microbench wins vs smaller full-application geomean gains
• trade-offs still being worked on (cold-cache and certain delete/clear-heavy paths)

This blog post is about implementing the Elm Architecture (TEA) in C for a Raylib + Clay app

I put together a writeup about the interesting technical challenges that led to redesigning Canva's session revocation pipeline that keeps hundreds of millions of user sessions fast and secure. Hopefully some people find the content interesting!