Meta (Facebook) : Infrastructure Engineer / DevOps Engineer (L5) : USA : Meta Full loop interview
- Location
- USA
- Posted
- 10 Jun 2025
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.
How it went
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?
⸻
🔹 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.
Questions asked (9)
- 01
Merge Sorted Arrays In-Place
Data Structures & Algorithms
Given two sorted arrays, merge them in-place.
- 02
Level Order Traversal with Custom Sorting
Data Structures & Algorithms
Implement Level Order Traversal with custom sorting.
- 03
Tree BFS Level-wise Optimization
Data Structures & Algorithms
Variants on level-order traversal and memory-efficient implementation using deque, avoiding sorting inside BFS.
- 04
Led a High-Impact DevOps Initiative
Behavioral
Tell me about a time you led a high-impact DevOps initiative.
- 05
Describe a Time You Failed
Behavioral
Describe a time you failed — what did you learn?
- 06
Conflict Across Teams and Resolution
Behavioral
Talk about a conflict across teams and how you resolved it.
- 07
Drive Alignment Without Authority
Behavioral
How do you drive alignment without authority?
- 08
Most Innovative Solution Implemented
Behavioral
What’s the most innovative solution you implemented recently?
- 09
Design an Advertisement Delivery System
System Design
Design an Advertisement Delivery System – similar to how Meta (Facebook) delivers personalized ads to users in near real-time.
How they prepared
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.