Sagnik Bhattacharjee

Writeups

• Reverse engineering the Qualcomm NPU compiler
  Reverse engineering · edge inference · Jun 2026
• What I learned trying to break a single GPU with mixed traffic
  Inference engineering · Jun 2026
• NPUs: what, and where they break
  Hardware · edge inference · Jun 2026

I write when something clicks or when I need to think out loud. Side Quests is where I dump running notes and experiments. I also wrote about building my own curriculum as a freshman, and put out a thread on staying calibrated as a generalist in fast-paced environments.

Also, my well curated Spotify playlist.

Projects

Things I built, mostly in my first year of college. I tend to go deep on one idea until it either works or teaches me something.

• sameshi - ~1200 ELO chess engine squeezed into 2KB of C, which hit the HN frontpage and was liked by Andrej Karpathy
• spheni - Vector search built from scratch with product quantization and residual encoding, which was well received on r/developersIndia
• dunefetch - Neofetch, but the ASCII art is a live falling sand simulation, which was loved on r/unixporn

I also built path tracers, inference runtimes, quantization libraries, syscall tracers, GEMM kernels, distraction blockers, and pixel editors - all on GitHub. The most used by strangers on the internet is, unexpectedly, yars - a Reddit scraper.