Q21. Why is semantic HTML preferred over divs with ARIA?
Semantic HTML uses elements that describe meaning: header, nav, main, section, article, aside, footer, button, label, table and ul. Assistive technologies and browsers de...
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Job Interview Questions and Answers Directory
Search and filter frequently asked interview questions across technical, programming, and behavioral domains. Tailor your interview preparation by difficulty for freshers or experienced developers (72 available).
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Q22. What does observability mean and how do the three pillars differ?
Observability is the ability to understand a system's internal state from its outputs, so you can debug novel problems without shipping new code. - Metrics: cheap numeric...
Q23. What is the difference between vanity metrics and actionable metrics?
Vanity metrics look impressive but do not guide decisions: total registered users, page views, cumulative downloads. They only go up, lack context and cannot be tied to a...
Q24. Explain canary deployments.
A canary releases the new version to a small slice of traffic before a full rollout. Process: 1. Deploy the new version alongside the stable one. 2. Route a small percent...
Q25. Explain liveness, readiness, and startup probes.
Probes let Kubernetes decide a container's health and readiness. - readinessProbe: whether the Pod should receive traffic. Failing it removes the Pod from Service endpoin...
Q26. How does colour contrast work and what ratios are required?
WCAG contrast is measured as a ratio between the relative luminance of text and its background, ranging from 1:1 to 21:1. At level AA, normal text needs at least 4.5:1 an...
Q27. Why does mutating arrays or objects sometimes not update a Svelte 3/4 component?
In Svelte 3 and 4 reactivity is triggered by assignment to the variable the compiler tracks. Mutating an array or object in place does not notify the compiler because no ...
Q28. Where do you see yourself in five years?
Show ambition that is compatible with the company and role. Strong answer: "In the next year I want to fully own my area and hit measurable reliability and delivery goals...
Q29. What is the difference between gross margin and net margin?
Gross margin is revenue minus cost of goods sold, divided by revenue. It measures how much is left after the direct costs of delivering what you sell, such as materials, ...
Q30. What does ACID mean in the context of transactions?
ACID describes the guarantees of a transaction, a unit of work that either completes fully or not at all. - Atomicity: all statements commit or all roll back. Implemented...