xAI Coding Interview Questions
These are the 12 xAI coding interview questions AceOffer has reconstructed from candidate reports, sorted by how often each was reported. In-Memory Database / KV Store with Transactions leads at 9×. Every question shows when it was last reported; the catalog refreshes monthly.
Key facts
- •12 distinct coding questions indexed
- •36 candidate reports across those questions
- •Most reported: In-Memory Database / KV Store with Transactions — 9× (last seen April 2026)
- •Refreshed monthly · last updated September 2026
Which xAI rounds ask coding questions?
xAI draws coding questions from the rounds below. Counts are distinct questions, not times asked.
Most reported: In-Memory Database / KV Store with Transactions — 9×
Most reported: Process vs Thread (and the Risks of Shared Memory) — 4×
Which xAI coding questions get asked most?
Sorted by candidate-report frequency. Click any question for the full breakdown.
| Question | Round | Reported | Last seen |
|---|---|---|---|
| In-Memory Database / KV Store with TransactionsFree Implement an in-memory key-value store that supports transactions. Core operations: set(key, field, value), get(key, field), delete(key, field). Transaction operations: begin/start a transaction,… | Coding | 9× | April 2026 |
| Process vs Thread (and the Risks of Shared Memory) An OS-fundamentals question asked verbally in the phone screen — unexpected from an AI lab, and reported 4 times between March 2025… | Phone Screen | 4× | January 2026 |
| LRU Cache (incl. Weighted Variant) Implement an LRU (Least Recently Used) cache supporting get and put. The standard variant uses a fixed item-count capacity: get(key) returns the… | Coding | 4× | February 2026 |
| Palindromes in Decimal and Binary Find all integers from 1 to 100,000 that are palindromes in both their decimal (base-10) and binary (base-2) representations. In the observed… | Phone Screen | 3× | October 2024 |
| Parallelized / Multi-threaded Sorting Given an integer array, implement a sorting algorithm that leverages multiple threads — multithreading is mandatory, not optional. The solution must be… | Coding | 3× | January 2026 |
| BankAccount Race Condition (Find & Fix) You are given a BankAccount class with a deposit() method, exercised via a ThreadPoolExecutor with 2 workers submitting two concurrent deposits (e.g.,… | Coding | 3× | November 2025 |
| Radix Cache / Trie vs Radix Tree Design and implement a RadixCache — a prefix-compressed tree that stores sequences of integers (not characters). Support insert(sequence), which automatically merges shared… | Coding | 2× | September 2025 |
| Autocomplete Input Box (Local Data, Offline-Safe) A frontend coding round: hand-roll an autocomplete input box. The dataset is thousands of rows stored in a single local file (no… | Coding | 2× | June 2026 |
| Flatten & Unflatten Nested Structure A JSON / hierarchical-data processing problem in two parts. Part 1 (Flatten): given a nested Python structure whose containers may be dict,… | Coding | 2× | February 2026 |
| Concurrent Job / Task Scheduler Implement a concurrent task/job scheduler with multiple workers. The scheduler must accept submitted jobs, dispatch them to available workers, and coordinate concurrent… | Coding | 2× | October 2025 |
| GPU Node Failure Detection (Group Testing) Given N GPU nodes, you have access to a test(S) function where S is a set of nodes: test(S) returns True if… | Coding | 1× | December 2025 |
| Twitter Spaces Active Hours Tracking Given a list of operation records, each containing (operation, twitter_space_id, user_id, timestamp) where operation is one of 'create', 'join', or 'leave', compute… | Coding | 1× | January 2026 |
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