Coolbet Interview Questions
The questions to prepare for Coolbet interviews, across all roles. Questions from real interview reports rank first. Updated daily.
Evaluates your system design skills for building scalable, concurrent APIs.
Tests ability to reason about performance, storage, and write costs for indexing choices.
Assesses your understanding of microservices architecture trade-offs.
Tests learning agility under pressure, plus ownership and prioritization when rapid technical ramp-up is required.
Tests how you receive peer feedback in code reviews, respond constructively, and turn critique into better code and stronger team habits.
Optimize a slow PostgreSQL query that aggregates completed transactions while preserving customers with no matching activity.
Explain a safe, incremental strategy to refactor legacy code with no tests by first capturing current behavior and reducing change risk.
Assesses your approach to concurrency, async control flow, and reliability.
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Write an optimized PostgreSQL query that aggregates qualifying Citi account transactions efficiently.
CitiOptimize a PostgreSQL transaction query that filters, aggregates, ranks, and returns top merchants efficiently on large tables.
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