Hi, I’m Yuejun Sun
I’m a software engineer who enjoys working close to the metal — systems programming, performance, and understanding how things really work underneath the abstractions.
This blog is where I keep notes on what I’m learning and building: debugging stories, design decisions, and the occasional deep dive into something that caught my curiosity.
What I write about
- Systems & performance — profiling, memory, concurrency, the Linux stack
- Engineering craft — tooling, testing, and keeping codebases healthy
- Lessons from real bugs — the ones worth writing down
Elsewhere
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