xAI interview questions

Real questions asked at xAI, sourced from the community.

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What is the project you are most proud of?

If you were building an autocomplete experience, how would you use underlying data to predict the next word a person is going to type?

System designPM

Design a file upload feature for an AI chat application.

Implement LRU Cache.

Assume the model needs a 20% precision improvement in 2 weeks to 1 month and you have 8 to 10 contractors. How would you approach it, what data would you use, and how would you leverage the team?

Design and implement an in-memory key-value store that supports set, transactional begin, commit, and abort operations.

Design a rate limiter.

System designSWE

Design a task management system with tasks broken into sub-tasks.

System designSWE

How have you led teams at scale to improve models or algorithms post-training, especially using contractors?

Implement an iterator class that supports next, hasNext, getState, and setState, then extend it to treat a list of iterators as one continuous iterator with a global index.

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