Meta Sr Software Engineer interview questions

The Meta interview process began with an Online Coding Assessment (CodeSignal) consisting of four problems; notably, I advanced despite solving only 50% of the tasks due to an unexpected bug, which suggests the OA may act more as a threshold than a strict filter. This was followed by a Technical Phone Screen with a Meta developer—a fast-paced, 45-minute session requiring the solution of two LeetCode-style problems (typically Medium/Hard) on a notepad-style platform. A key aspect of this round is that code execution is disabled, forcing the candidate to rely entirely on manual dry-runs to verify logic, handle edge cases, and prove optimal time and space complexity. Although I successfully provided solutions for both problems, I was ultimately not selected for the next round, illustrating Meta’s extremely high bar for speed, fluidity, and "zero-hint" execution in the current competitive market.