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Meta Senior Software Engineer Interview Questions

9 real practice questions for the senior-level Senior Software Engineer role at Meta (Technology), spanning behavioral, technical, system design, and leadership. Lead technical projects and mentor junior engineers. The first 3 questions below include what Meta interviewers actually listen for, plus likely follow-ups.

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Questions
9
Categories
Behavioral (4), Technical (2), System Design (2), Leadership (1)
Difficulty mix
1 easy · 3 medium · 5 hard
Avg. answer time
~3 min

Behavioral Questions (4)

  1. 1.Basic questions on background

    easy~2 min

    What interviewers look for

    • Clear narrative connecting past experiences to current technical expertise
    • Demonstrates progression in technical complexity and impact over time
    • Shows examples of moving fast and taking ownership in previous roles
    • Highlights collaborative work and cross-functional impact
    • Mentions specific technologies or scale challenges that align with Meta's stack

    Likely follow-ups

    • Can you tell me about a time when you had to move fast on a project with incomplete information?
    • What's the most complex technical challenge you've solved in your career?

    Company context

    Meta uses background questions to assess how candidates' experiences align with their 'Move Fast' and 'Focus on Impact' values. Given Meta's flat hierarchy and expectation that engineers understand the full stack, they look for candidates who have taken ownership across different layers of technology and demonstrated impact at scale.

  2. 2.Why do you want to join meta

    medium~3 min

    What interviewers look for

    • Specific connection to Meta's mission of building community and bringing the world closer together
    • Demonstrates understanding of Meta's technical challenges around social graph and massive scale
    • Shows alignment with Meta's values: Move Fast, Be Bold, Focus on Impact, Be Open, Build Social Value
    • References specific Meta products or technologies and genuine interest in their evolution
    • Articulates how their skills can contribute to Meta's long-term vision in AI, VR/AR, or social platforms

    Likely follow-ups

    • Which of Meta's products or technical challenges excites you most and why?
    • How do you see your role contributing to Meta's mission of building the metaverse?

    Company context

    Meta specifically asks this to gauge genuine interest versus opportunistic job seeking. Given Meta's mission-driven culture and focus on long-term impact, they want engineers who are passionate about their products and technical challenges. The question also tests whether candidates understand Meta's evolution from Facebook to a broader technology platform company.

  3. 3.Tell me about a time when you identified and drove a significant technical improvement that wasn't on the roadmap.

    hard~3 min

    What interviewers look for

    • Shows initiative and ownership
    • Demonstrates ability to influence without authority
    • Explains how they balanced this with existing priorities
    • Quantifies the impact of the improvement
    • Built consensus and brought others along

    Likely follow-ups

    • How did you get buy-in from leadership?
    • What would you have done if the idea was rejected?

    Company context

    At Meta, we expect engineers to identify opportunities and drive impact, not just execute on what they're told.

  4. 4.Describe a time when you had to make a decision that would affect multiple teams. How did you approach it?

    hard~3 min

Technical Questions (2)

  1. 5.Implement a function to serialize and deserialize a binary tree. Walk through your design.

    medium~3 min

  2. 6.How would you design a system to detect and prevent coordinated inauthentic behavior on a social platform?

    hard~4 min

System Design Questions (2)

  1. 7.Design a content recommendation system for a social media platform with billions of posts.

    hard~5 min

  2. 8.System Design - delved a lot deeper

    hard~4 min

Leadership Questions (1)

  1. 9.Tell me about a time when you had to balance short-term delivery pressure with long-term technical health.

    medium~3 min

More Meta interview questions