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A preview from our curated question bank. The generator produces fresh, AI-tailored questions on each run.
What is REST? What are its key architectural constraints?
Tip: Name the 6 constraints: client-server, stateless, cacheable, uniform interface, layered system, code on demand (optional). Statelessness is the one interviewers probe most.
What is the difference between SQL and NoSQL databases? When would you choose each?
Tip: SQL: structured schema, ACID, relational. NoSQL: flexible schema, BASE, horizontal scale. Choose SQL for transactional data; NoSQL for high-write, schema-flexible workloads like logs or feeds.
What is connection pooling and why is it important?
Tip: A pool reuses existing DB connections instead of opening a new one per request. Critical at scale — opening a TCP + auth handshake takes ~100ms. HikariCP (Java) and pg-pool (Node) are common implementations.
What is the N+1 query problem? How do you solve it?
Tip: N+1 occurs when fetching a list of N records triggers N additional queries for related data. Fix with eager loading (JOIN), DataLoader batching, or selecting only needed fields. Common ORM trap.
How do you implement JWT-based authentication in a REST API?
Tip: Login endpoint returns signed JWT (header.payload.signature). Client sends it in `Authorization: Bearer <token>`. Server verifies signature with secret key — no DB lookup needed per request. Store refresh tokens in DB for revocation.
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