Dataford
Top 13
Prep plan
Updated weekly · Last refresh Sep 22
C

Coolbet Software Engineer Interview Questions

The questions to prepare for a Coolbet Software Engineer interview. Questions from real interview reports rank first. Updated daily.

13questions
~2htotal time
Track your progressSign up free to work through all 13 questions and resume where you left off.
Start practicing free →
1
System DesignStart here. 3 questions · ~27 min
Microservices Benefits and ChallengesMedium

Assesses your understanding of microservices architecture trade-offs.

challengesarchitecturemicroservicesCCoolbet
API for High-Concurrency RequestsHard

Evaluates your system design skills for building scalable, concurrent APIs.

system designapi designCCoolbet
Database Indexing Trade-OffsMedium

Tests ability to reason about performance, storage, and write costs for indexing choices.

Trade-offsdesignCCoolbet
2
Behavioral & Leadership7 questions · ~64 min
Solving a High-Stakes Technical FailureMedium

Tests ownership and leadership in solving a difficult technical problem, with emphasis on team impact, execution, and measurable results.

CommunicationLeadershipOwnershipCCoolbet
Handling Tough Code Review FeedbackMedium

Tests how you receive peer feedback in code reviews, respond constructively, and turn critique into better code and stronger team habits.

code reviewsCommunicationfeedbackCCoolbet
More Behavioral & Leadership questions with a free account
3
More topics3 questions · ~27 min
SQL Query OptimizationMedium
Practice

Optimize a slow PostgreSQL query that aggregates completed transactions while preserving customers with no matching activity.

Performance Tuningdatabase optimizationindexesCCoolbet
Safe Legacy Code Refactoring StrategyEasy

Explain a safe, incremental strategy to refactor legacy code with no tests by first capturing current behavior and reducing change risk.

RecursionArraysStringsCCoolbet
Handling Asynchronous OperationsMedium

Assesses your approach to concurrency, async control flow, and reliability.

handlingProgrammingasynchronousCCoolbet

Sign up to see every question

Create a free account to unlock this list and practice real interview questions.

Get my prep plan
Hands-on SQL practiceWrite and run real queries in the editor. 2 drills · ~20 min
Fixing Slow SQL QueriesMedium
Practice
Practice drill

Write an optimized PostgreSQL query that aggregates qualifying Citi account transactions efficiently.

Performance Tuningdatabase optimizationindexesCiti
Optimizing Slow SQL QueriesHard
Practice
Practice drill

Optimize a PostgreSQL transaction query that filters, aggregates, ranks, and returns top merchants efficiently on large tables.

Performance Tuningdatabase optimizationlarge datasetsSprinter HealthSentiLinkAutodesk
The finish line: interview-readyComplete all 13 questions plus 2 hands-on drills to finish this plan.