Synthesized from 18 candidate submissions for ALL.
Facebook’s hiring process is highly structured and rigorous, with a strong emphasis on problem-solving, algorithmic efficiency, and system design skills. Rejections often hinge on incomplete solutions, suboptimal complexity analysis, or missed edge cases, particularly in system design rounds. Candidates across all levels—from interns to senior engineers—are expected to demonstrate proficiency in core data structures, algorithms, and scalable system design, with behavioral rounds serving as a secondary but critical evaluation component.
The candidate participated in a multi-round interview process at Facebook, including screening, technical, design, and behavioural rounds. The candidate was rejected, potentially due to not solving one of the coding problems in the first onsite round.
Two coding questions were asked. The first involved calculating a moving average. The second required finding the nearest island from a starting point using BFS.
Two coding problems were solved. The first involved populating next right pointers in each node of a binary tree using a queue. The second required finding the union of two lists of non-overlapping, sorted intervals.
Two coding problems were solved. The first involved printing a linked list backward. The second required finding the minimum number of knight moves to reach a target position.
A system design round focused on designing a streaming service for registered users, similar to Netflix.
Two coding problems were solved. The first involved finding the Kth largest element in an array using a heap. The second required cloning a graph using DFS.
A behavioural round focused on project discussions and behavioural questions.
The candidate passed the first phone screen and received positive feedback from the recruiter, advancing to the next stage.
A 45-minute phone screen focused on BGP and basic L2/L3 forwarding concepts.
BGP and basic L2/L3 forwarding concepts
The recruiter provided positive feedback and suggested moving to a second phone screen for a coding assessment.
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