Career challenges
Short multiple-choice and scenario quizzes on the topics candidates search for most - pass odds, pay intuition, frontend level, mistakes, and job-market readiness.
N+1 query problem
Recognize, measure, and fix the classic ORM performance bug.
6 questionsStart test
Environment variables & secrets
Config by env, and why secrets are not 'just a string' in the repo.
6 questionsStart test
API rate limiting
429, fairness, and why naive IP limits misfire behind NAT.
6 questionsStart test
Database indexes - basics
What indexes are for, and what they are not: magic for every query.
6 questionsStart test
Database migrations
Versioned schema changes, reviews, and safe deploy habits.
6 questionsStart test
Idempotency keys in APIs
Safe retries, deduplication, and why GET is not enough for every write.
6 questionsStart test