"Tell me about a time you disagreed with a coworker on a meaningful engineering decision for a mobile product, such as an Android or iOS change in Facebook, Instagram, or Messenger. How did you handle the disagreement, and what was the outcome?"
This question tests whether you can handle peer conflict constructively without turning it into politics, avoidance, or escalation. For a Mobile Engineer at Meta, disagreements often happen around architecture, performance, rollout risk, product tradeoffs, or launch timing across cross-functional teams. Interviewers want to see whether you can stay direct, respectful, and data-driven while still moving the work forward.
They are also looking for signs that you can influence without authority. A strong answer shows that you did more than defend your opinion: you understood the other person’s reasoning, clarified the decision criteria, and helped the team reach a better outcome.
A strong response uses one specific example with real stakes, explains why the disagreement mattered, and walks through how you resolved it step by step. The best answers show mature communication, measurable results, and a lesson learned about how you now handle conflict more effectively.