Nerdwallet Backend Engineer Interview Questions

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

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CodingStart here. 3 questions · ~35 min

Implement LRU CacheEasy

Practice

Problem Design a data structure that implements an LRU (Least Recently Used) cache. The cache should support the following operations: - get(key): Retrieve...

Hash TablesQueueLinked Lists

Nerdwallet

Implement a JSON EncoderMedium

Evaluates your ability to implement JSON encoding with attention to edge cases and output correctness.

Nerdwallet

Build a JSON SerializerMedium

Evaluates your understanding of serialization, data modeling, and correctness in backend code.

Nerdwallet

More topics3 questions · ~35 min

Schedule Tasks at Specific TimesHard

Assesses your approach to time-based scheduling, reliability, and operational concerns.

Nerdwallet

Web Cache and QueuesMedium

Assesses system design choices for caching, asynchronous processing, and ETL versioning at Nerdwallet.

data processingETL

Nerdwallet

Periodic Data NormalizationHard

Tests your ability to design reliable periodic ingestion and record update workflows.

Batch Processing

Nerdwallet

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