Arkad Spa Interview Questions

The questions to prepare for Arkad Spa interviews, across all roles. Questions from real interview reports rank first. Updated weekly.

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CodingStart here. 4 questions · ~57 min

Serialize and Deserialize Binary TreeMedium

Practice

Serialize a binary tree to a string and reconstruct it exactly using preorder traversal with null markers.

RecursionHash TablesQueue

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Merge Overlapping IntervalsEasy

Practice

Merge overlapping intervals by sorting start times and greedily extending the current range.

CodingtechnicalProgramming

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Serialize Binary Tree for MessengerMedium

Practice

Problem In Meta Messenger infrastructure, tree-shaped data may need to be converted into a string for transport and rebuilt later. Implement functions to s...

RecursionHash TablesTrees

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Longest Unique Substring in EnoMedium

Practice

Use a sliding window and hash map to find the longest substring without repeated characters in a string.

Hash TablesStringsTwo Pointers

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Execution6 questions · ~85 min

Discuss a Meaningful FailureEasy

Reflect on a real execution failure, what caused it, how you responded, and what you changed afterward.

Trade-offsSuccess CriteriaRisk Assessment

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Design Inference API Rate LimitingHard

Design a rate-limiter for a multi-tenant AI inference API that protects capacity, preserves fairness, and supports different customer tiers.

Trade-offsdesign systemrate limiting

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Responding to Tough Review FeedbackEasy

Explain how you handled difficult code review feedback while keeping delivery on track and aligning with stakeholders.

Trade-offsSuccess CriteriaRisk Assessment

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