Backend & Database Interview Questions
Backend interview questions on SQL vs NoSQL, indexing, REST vs GraphQL, Redis caching, and database design.
Backend interviews focus on data modeling, API design, and scaling databases. Interviewers ask about choosing the right database (SQL vs NoSQL), designing indexes for query performance, and building APIs that are flexible yet efficient. You may also face questions on caching strategies, eventual consistency, and handling high traffic—skills that matter for any backend or full-stack role.
This section covers SQL vs NoSQL trade-offs, database indexing (B-tree, composite indexes), REST vs GraphQL API design, and Redis caching patterns. Each topic includes interview-style questions with clear answers and real-world scenarios. Use these guides to prepare for backend rounds at companies ranging from startups to large tech firms.
Trending Sub-topics
- SQL vs NoSQL— SQL vs NoSQL interview questions — when to use relational vs document vs key-value databases.
- Indexing— Database indexing interview questions — B-tree, composite indexes, query optimization.
- REST vs GraphQL— REST vs GraphQL interview questions — API design, over-fetching, schema evolution.
- Redis Caching— Redis caching interview questions — cache strategies, invalidation, distributed cache patterns.
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