Frontend Engineering

⏱ 8 min read Toast notifications appear in nearly every web app. They look trivial; production-quality toasts are not. The interview tests whether you […] Read article

⏱ 5 min read Wizards (multi-step forms) appear in checkout flows, onboarding, signup, settings. The interview tests whether you understand cross-step state management, validation Read article

⏱ 4 min read Tooltips and popovers seem trivial until you implement them. The interview probes whether you understand viewport-aware positioning, accessibility (which differ Read article

⏱ 3 min read Skeleton loaders (gray boxes shaped like the eventual content) make slow apps feel faster. They appear in nearly every modern Read article

⏱ 3 min read Bundle size is one of the most-tracked frontend metrics. Every kilobyte costs render time, especially on mobile. Senior frontend interviews Read article

⏱ 2 min read Routing is everywhere in frontend, yet many engineers know only one library and one pattern. Senior interviews probe whether you Read article

⏱ 3 min read Building a component library is one of the highest-impact frontend specialties. A good library compounds across the entire org. A Read article

⏱ 2 min read WebSockets are easy to demo and hard to run at scale. Senior frontend interviews probe whether you understand the production Read article

⏱ 2 min read Code splitting is the highest-impact performance optimization for modern web apps. The wrong bundling strategy ships 5MB of JavaScript on Read article

⏱ 3 min read Frontend observability is one of the biggest gaps at most companies. Backend has Datadog, Splunk, Grafana. Frontend often has nothing Read article

⏱ 2 min read Charting is one of the more demanding frontend specialties — combining data visualization theory, SVG performance, accessibility, and the ergonomic Read article

⏱ 3 min read “Build a file uploader” is one of the most popular frontend interview questions because it tests UX patterns (drag-drop, progress), Read article

⏱ 3 min read Progressive Web Apps (PWAs) hit their decade mark in 2025. The 2026 reality: PWAs are real, useful, and underused. The Read article

⏱ 3 min read “Build a modal” is one of the most common frontend interview questions. It looks simple. It is not. The interview Read article

⏱ 5 min read An image gallery with lightbox (thumbnails grid + tap-to-zoom modal) appears in many products. The interview tests virtualization, accessibility, gesture Read article