Meta US E4 Interview experience | Kumar K | CTC - 1 CR | December 2025

Question

went through 6 interview rounds at Meta, covering coding, AI, system design, and behavioral alignment.

 

1️⃣ Online Assessment (CodeSignal)

Progressive file system problem

Solved 3 out of 4 levels

Focused on correctness, edge cases, and clean logic

 

2️⃣ Technical Phone Screen

Array problem: Finding the cheapest round-trip cost for a given day (i → i)

Binary Tree: Vertical Order Traversal

Completed both problems in ~20 minutes

Discussed time & space complexity and follow-up optimizations

 

3️⃣ Virtual Onsite Interviews

Round 1 – Coding

https://leetcode.com/problems/letter-case-permutation/description/

https://leetcode.com/problems/count-nodes-equal-to-average-of-subtree/description/

 

Variation of Count Nodes Equal to Average of Subtree

Emphasis on recursion, tree traversal, and correctness

Code: (LeetCode reference)

 

Round 2 – AI Coding Round

Problem focused on reasoning, constraints, and implementation clarity

Evaluated ability to apply ML/AI-oriented thinking to coding tasks

 

Round 3 – System Design

Design DoorDash

Covered:

Order flow & lifecycle

Scalability & availability

Real-time updates

Trade-offs and bottlenecks

 

Round 4 – Behavioral

Deep dive into Meta values

Ownership, impact, collaboration, and learning mindset

Used structured, real examples with reflection

 

✅ Final Outcome

 

Strong Hire feedback across all rounds

Joining Meta as Software Engineer (E4)

Start date: January 2026