Meta (Facebook) : Infrastructure Engineer / DevOps Engineer (L5) : USA : Meta Full loop interview
Summary
I completed a full-loop interview for an L5 Infrastructure Engineer / DevOps Engineer role at Meta (Facebook) in USA in April 2025, which consisted of 4 rounds focusing on DSA, Behavioral, and System Design.
Full Experience
Interview Date: April 2025 Status: Completed All Rounds
Interview Format & Round Breakdown
Meta’s interview process was structured, fast-paced, and focused heavily on system-level problem solving and communication. There were a total of 4 rounds over 2 days, broken into:
Day 1 – Technical Coding Rounds (Live CoderPad)
🔹 Round 1 – Data Structures & Algorithms (45 mins)
1. Merge Sorted Arrays In-Place
2. Level Order Traversal with Custom Sorting?
🔹 Round 2 – Data Structures & Algorithms (45 mins)
1. Tree BFS Level-wise Optimization: Variants on level-order traversal and memory-efficient implementation using deque, avoiding sorting inside BFS.
Day 2 – Behavioral & System Design
🔹 Round 3 – Behavioral Interview (45 mins)
• Tell me about a time you led a high-impact DevOps initiative
• Describe a time you failed — what did you learn?
• Talk about a conflict across teams and how you resolved it
• How do you drive alignment without authority?
• What’s the most innovative solution you implemented recently?
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🔹 Round 4 – System Design Interview (45 mins)
• Design an Advertisement Delivery System – similar to how Meta (Facebook) delivers personalized ads to users in near real-time.
Interview Questions (9)
Merge Sorted Arrays In-Place
Given two sorted arrays, merge them in-place.
Level Order Traversal with Custom Sorting
Implement Level Order Traversal with custom sorting.
Tree BFS Level-wise Optimization
Variants on level-order traversal and memory-efficient implementation using deque, avoiding sorting inside BFS.
Led a High-Impact DevOps Initiative
Tell me about a time you led a high-impact DevOps initiative.
Describe a Time You Failed
Describe a time you failed — what did you learn?
Conflict Across Teams and Resolution
Talk about a conflict across teams and how you resolved it.
Drive Alignment Without Authority
How do you drive alignment without authority?
Most Innovative Solution Implemented
What’s the most innovative solution you implemented recently?
Design an Advertisement Delivery System
Design an Advertisement Delivery System – similar to how Meta (Facebook) delivers personalized ads to users in near real-time.
Preparation Tips
Core DSA: Focus on Arrays, Strings, Hash Tables, BFS, Sorting System Design: Practice Meta-level scenarios like: Instagram, News Feed, Chat, Proximity Service, TinyURL Discuss trade-offs, scaling, consistency, fault tolerance Behavioral: Prepare stories with measurable impact. Use STAR format and align with Meta values.