"Tell me about a specific time you disagreed with a coworker on a mobile engineering decision — for example, around an Android or iOS implementation for Facebook, Instagram, or Messenger. How did you handle the disagreement, what did you do to resolve it, and what was the outcome?"
At Meta, engineers regularly work across functions and code ownership boundaries, and disagreement is normal. This question tests whether you can handle conflict directly and professionally, use evidence instead of ego, and keep momentum on a product or engineering goal even when you do not have formal authority over the other person.
Interviewers are looking for how you balance conviction with openness. They want to understand whether you sought to understand the other person’s perspective, how you communicated under pressure, and whether you optimized for the team and product rather than for “winning.”
A strong answer uses one concrete example with real stakes, a clear disagreement, and a thoughtful resolution path. The best responses show respectful direct communication, data or user impact behind the decision, a willingness to update your own view if needed, and a clear result you helped drive.