Overall Technical Foundation and Potential Questions
Holistic evaluation of your coding ability, problem-solving approach, technical understanding, and learning capacity. The hiring manager may ask exploratory technical questions or dive deeper into your responses from previous rounds to gain confidence in your capability.
MediumTechnical
56 practiced
Implement an LRU cache in the language of your choice (suggest Python or Java) that provides O(1) get(key) and put(key, value) operations, supports a maximum capacity, and evicts the least recently used item when full. Describe your data structures and edge cases such as updating existing keys or capacity zero.
MediumTechnical
69 practiced
You are assigned to review a pull request containing a 300-line function with complex business logic and no tests. Describe your step-by-step review approach: what you inspect for correctness, performance, security, maintainability, cyclomatic complexity, test coverage, and how you would provide actionable feedback and propose refactors.
MediumSystem Design
43 practiced
Design an in-memory caching layer for frequently accessed metadata including TTL, eviction policies like LRU or LFU, cache stampede protection, and options for single-node versus distributed deployment. Discuss consistency strategies and what changes when using Redis or Memcached in production.
HardTechnical
50 practiced
Describe how modern CPUs execute instructions: pipelining, superscalar execution, out-of-order execution, speculative execution, and branch prediction. Explain how these aspects influence micro-optimizations like loop unrolling, branchless code, and instruction-level parallelism and provide an example where code reordering improved performance significantly.
MediumTechnical
41 practiced
Implement a function lower_bound(arr, target) in Python that returns the index of the first element greater than or equal to target in a sorted array that may contain duplicates, or len(arr) if none. Explain correctness, boundary conditions, and demonstrate behavior on empty and all-equal arrays.
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