Meta · Behavioral 1 of 2

Tell me about the project where you had the largest impact.

Scope, personal contribution, measurable outcomes, and your understanding of why the work mattered.

Practice question: an editorial practice prompt, not a claim that Meta asks this exact question. Interviews vary by role, level, team, and location.

How to approach this question

A focused three-stage walkthrough

  1. 1
    Context

    Set the baseline and the people affected.

  2. 2
    Decisions

    Separate your decisions from the team’s work.

  3. 3
    Evidence

    Measure the result and explain what scaled.

Behavioral answer framework

Build evidence, not a memorized speech

Context

Give only the background needed to understand the stakes and your responsibility.

Decisions

Spend most of the answer on what you personally considered, chose, and did.

Evidence

Close with a defensible result, learning, and what changed afterward.

Self-review rubric

What a strong practice attempt includes

  • A specific situation with meaningful stakes
  • Your contribution is distinct from the team’s
  • The trade-off behind your decision is clear
  • The result and learning are concrete
Likely follow-ups

Answer the main question first, then take these on one at a time:

  • Why was this your biggest impact?
  • What trade-off did you make?
  • What would you change now?
Avoid these mistakes

Check your recording or written solution against this list:

  • Only describing complexity
  • Taking team credit
  • No user or business result
Sources and methodology

This guide combines general interview-practice patterns with the public hiring material below. The practice prompt and coaching are PiriPiri AI editorial content, not official Meta questions or answers.

Meta Careers: software engineering full-loop prep ↗
Official sources reviewed 20 September 2026.