In progressOnsite

Onsite Loop with a 1-on-1 Chat System Design, File Dedup Coding, and a Culture Round I Couldn't Read

AnthropicSoftware Engineer · Onsite · Mar 2026

The phone screen was Q1 image processing — using PIL to do grayscale, scale, and resize. The first step handled small images, the second step handled large images, and improving performance meant using ProcessPoolExecutor. The recruiter had mentioned beforehand that I should be comfortable with parallelism/concurrency, which was basically a hint. Time was a bit tight and the interviewer had to nu…

Shared by a candidate · reported Mar 2026. Interview formats change; use it as a guide, not a script.