The answer
Juniors: easy to medium problems (arrays, strings, basic trees). Mid-level: medium problems. Seniors: medium to hard (less emphasis than juniors; seniors are evaluated more on system design and architecture).
What Companies Expect From Junior vs Senior Frontend Developers
What DSA difficulty is expected for junior vs senior frontend interviews?
More FAQs in What Companies Expect From Junior vs Senior Frontend Developers
JavaScript/HTML/CSS fundamentals, React basics (hooks, components, state), machine coding (build a UI component), easy to medium DSA, and learning ability. They do not expect system design or deep performance optimization.
Architecture and system design (design Instagram feed, Netflix player), deep performance optimization (Core Web Vitals, caching), leadership (mentoring, code reviews), trade-off discussions, and cross-team impact (design systems, tooling).
Juniors are tested on fundamentals, machine coding, and easy DSA. Seniors are tested on architecture, system design, performance, leadership, and trade-offs. Mid-level is in between: deep JS/React, medium DSA, basic system design.
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