Synthesized from 38 candidate submissions for ALL.
Meta's hiring process is highly standardized, prioritizing efficient algorithmic problem-solving and clear communication of trade-offs. The process typically includes a rigorous technical screening followed by an intensive onsite loop consisting of coding, system design, and behavioral evaluations.
The candidate completed two technical problems in a Meta screening round. The first problem involved tree traversal and debugging, while the second focused on binary search and array manipulation. The candidate received hints for the second problem but managed to implement the solution correctly. The candidate later received confirmation of passing to the next stage.
The round consisted of two coding problems. The first problem involved explaining and coding a solution related to tree traversal, specifically summing root-to-leaf numbers. The candidate identified and fixed a bug during the explanation. The second problem focused on finding the first and last positions of an element in a sorted array, with an additional requirement to count repetitions. The candidate initially proposed a brute-force solution and then optimized it using binary search after receiving hints.
Sum Root to Leaf Numbers
Find First and Last Position of Element in Sorted Array (with repetition count)
The candidate was asked to implement the solution for finding the first and last positions of a target element in a sorted array, including counting its repetitions. The implementation was done under time constraints while explaining the approach. The interviewer stopped the candidate after the solution was explained and agreed upon, allowing the candidate to proceed to coding.
Find First and Last Position of Element in Sorted Array (with repetition count)
The interview consisted of a single technical design question focused on high-level system architecture and concurrency management. The process was described as difficult.
The candidate was asked to design a specific backend service focusing on concurrency and memory constraints.
Design a Concurrent, Memory-Bounded Tally Service
InterviewDigest