Meta | E6 | Onsite | US

I recently interviewed for a Software Engineer position at Meta. I had 15 years of experience and opted for a Systems Design (Infra) interview.

Coding Round 1:

• Merge 3 sorted arrays - Similar to Merge Sorted Array
• Pow(x, n) - Pow(x, n)

Coding Round 2:

• Range Sum of BST - Range Sum of BST
• Next Permutation - Next Permutation I struggled with this question and couldn't complete it.

System Design Round 1: Ad Impressions Aggregator - Similar to a click aggregator. This round included questions on table design and API design.

System Design Round 2: Design a simplified Instagram with the following features:

• Upload photos
• Follow other users (unidirectional)
• View newsfeed
• Receive notifications when a followed user uploads a photo

The interviewer asked in-depth questions about load balancing, notification frequency, feed generation efficiency, and fault tolerance.

Behavioral Round: This round consisted of general questions about past projects and conflict resolution.

I was rejected about a week later. I did not receive feedback due to company policy. For an E6 level, the system design rounds are very important. I believe I could have performed better in those rounds, particularly the "Ad Impressions Aggregator" design.