Nextdoor Software Engineer Interview Questions
The questions to prepare for a Nextdoor Software Engineer interview. Questions from real interview reports rank first. Updated daily.
Build a parent-child comment tree from a flat list using a hash map and tree traversal.
NextdoorCount consecutive triplets with exactly two equal values using a linear scan.
NextdoorDesign the data and ML serving layer for a Nextdoor-like feed with huge scale, low latency, and fresh neighborhood content.
NextdoorDesign an end-to-end ML architecture with front-end and back-end serving, training, evaluation, and monitoring.
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Evaluate the execution trade-offs between monoliths and microservices and explain how you would choose the right approach.
NextdoorApproach for migrating data between databases with validation, idempotent loads, and schema change handling.
NextdoorAssesses ability to implement correct version ordering logic with edge cases.
NextdoorOptimize a PostgreSQL reporting query by reducing intermediate rows, using appropriate joins, and calculating monthly performance efficiently.
NextdoorCompute daily active users and a 7-day rolling average using a CTE, distinct counts, and window functions.
Meta
Spotify
Meta ITUse CTEs, joins, and date filtering to calculate 30-day retention by signup cohort from login and feature usage data.
Curefit
Indeed
TikTok