xAI technical phone screen interview
Round 3 of 7 · 8 questions reported
- Length
- 45 min
- Format
- Live applied coding on a shared platform such as CoderPad
- They grade
- Complete, bug-free working code; class and object design
- AI use
- No AI
- Heads-up
- Typical tasks: caches, key-value stores with TTL, rate limiters, iterators, flattening nested objects. Follow-up extensions are where it gets hard; complexity analysis matters less. Some tracks run three of these in one week, mixing coding, ML coding and a project deep dive.
Questions xAI asks in this round 8
- Find and fix the races in a bank account classApr 2026 · rarely
- Data-parallel and fully sharded matrix multiply over simulated devicesApr 2026 · once
- Flatten and rebuild nested Python containersFeb 2026 · once
- Implement an LRU cacheFeb 2026 · once
- Design an agent workflow that produces a feature-length videoJan 2026 · once
- Most distinct values after shifting each element by at most kJan 2026 · once
- Find bad GPU nodes with group testsDec 2025 · once
- Inference loop with continuous batching over a mock modelDec 2025 · once
About the xAI technical phone screen round
What does xAI ask in the technical phone screen round?
The most asked: Find and fix the races in a bank account class, Data-parallel and fully sharded matrix multiply over simulated devices and Flatten and rebuild nested Python containers. 8 questions reported in all.
How long is the xAI technical phone screen round?
About 45 minutes.
What is the xAI technical phone screen round like?
Live applied coding on a shared platform such as CoderPad. They grade: Complete, bug-free working code; class and object design.
Can you use AI in the xAI technical phone screen round?
No AI.