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Full Stack Web Development Interview Questions & Answers

Modern full-stack architectures, Node.js event loop, React performance, REST vs GraphQL, and caching strategies.

Medium 3 views

How would you prevent a checkout retry from creating two orders?

Accept an idempotency key representing the user’s intended checkout operation and store it with a request fingerprint and result under a uniqueness constraint. Atomically associate the key with order ...

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A page makes one database query per displayed item. What is the problem and how would you fix it?

This is often an N+1 query pattern: one query loads the list and another query loads related data for each row. Measure query counts and latency to confirm it. Fetch required relationships through an ...

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How would you add pagination to an API whose records change frequently?

Use a stable sort with a unique tie-breaker, such as created_at followed by id. Offset pagination is simple but can skip or repeat records as earlier rows change and can become expensive at large offs...

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How would you deploy a database change while old and new application versions run together?

Use an expand-and-contract sequence. First add compatible schema elements, then deploy code that tolerates both representations and backfill data in controlled batches. Verify completeness and behavio...

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