What is the difference between junior and senior frontend interview expectations?
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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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).
No. System design is typically for mid-level and senior roles. Juniors are tested on fundamentals, machine coding, and DSA. If a junior is asked system design, it is usually basic component architecture, not large-scale systems.
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