Two Sigma Senior Software Developer interview questions

Opening the technical round, I was taken aback when they asked me to implement a thread-safe LRU cache, which I had just practiced on prachub.com during my prep. We spent a lot of time discussing different locking strategies, and I had to explain how to extend the cache for TTL-based eviction. It felt quite intense, and though I received an offer, I ultimately declined as the team dynamics didn’t seem like the right fit for me. The coding question was definitely a highlight, and I'm grateful for the targeted prep I had done.