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F22 Labs Software Engineer Interview Questions

The questions to prepare for a F22 Labs Software Engineer interview. Questions from real interview reports rank first. Updated daily.

10questions
~1htotal time
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1
Technical FundamentalsStart here. 6 questions · ~48 min
Error Handling in Async FlowsMedium

Evaluates error propagation and resilience in async code.

error handlingFF22 Labs
Observability for NestJS PerformanceMedium

Evaluates monitoring, tracing, and metrics strategy for a NestJS service.

observabilityFF22 Labs
Worker Threads vs Child ProcessesMedium

Compares concurrency models for CPU-heavy workloads.

node.jsFF22 Labs
Worker Threads Shared MemoryMedium

Tests knowledge of Node.js worker_threads and memory sharing.

node.jsFF22 Labs
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2
System Design3 questions · ~24 min
Exactly-Once Processing in Event-Driven AppsHard

Tests strategy for reliable message processing guarantees.

FF22 Labs
Structure NestJS for High ConcurrencyHard

Evaluates system design and modular architecture for payment workflows.

FF22 Labs
Kafka vs RabbitMQ in Finance at F22 LabsHard

Evaluates messaging system selection in a regulated financial context.

kafkaFF22 Labs
3
More topics1 question · ~8 min
Optimizing Slow Cost Reporting QueriesMedium

Explain how to diagnose and optimize a slow PostgreSQL reporting query using joins, CTEs, aggregations, and date filters.

JoinsData WranglingCTEsFF22 Labs

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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Optimize a Slow SQL QueryHard
Practice
Practice drill

Rewrite a slow PostgreSQL loan payment query to reduce scanned rows while preserving the required aggregated results.

database optimizationJoinsData WranglingBiz2CreditAmeripriseEEltro Cyberchrome Private
Optimize Dashboard Query PerformanceMedium
Practice
Practice drill

Diagnose and optimize a slow TaskRabbit dashboard query using execution plans, indexing, filtering, and pre-aggregation.

database optimizationJoinsData WranglingIInfo OriginCohere TechnologyTaskRabbit
Top Credit Score Applicants by StateMedium
Practice
Practice drill

Identify the highest-credit-score 5% of applicants within each state using percentiles and window ranking.

Window FunctionsJoinsRankingAmerican Credit Acceptance
The finish line: interview-readyComplete all 10 questions plus 3 hands-on drills to finish this plan.