4 min read By 2026 the AI-coding-assistant market has consolidated into a few clear leaders. Senior interviews probe whether you can articulate what […] Read article
3 min read “Design Lime / Bird / Citi Bike” is a senior+ mobile system design that combines geographic discovery, IoT unlock-and-lock, real-time Read article
3 min read “Design a dating app” varies by which app you mean. Tinder is swipe-based; Hinge is profile-comment-based; Bumble is conversation-window-based. This Read article
3 min read “Design a voice memos app” looks like a simple recorder until you list the requirements: high-quality audio capture, on-device transcription, Read article
3 min read “Design a smart home app” is a senior+ mobile system design that combines protocol heterogeneity, real-time control, automations, and the Read article
4 min read Frontend testing matured considerably between 2020 and 2026. Vitest replaced Jest for most modern projects; Playwright is the dominant E2E Read article
3 min read “Build a GitHub-style activity heatmap” is a frontend interview prompt that combines calendar math, data binning, color scaling, hover/focus interactions, Read article
3 min read “Build an avatar upload” is a classic frontend machine-coding question that looks simple until you implement it. The hard parts: Read article
4 min read The acronyms keep multiplying — SSR, CSR, SSG, ISR, RSC, PPR, DSC. Senior frontend interviews probe whether you can articulate Read article
3 min read “Design Webtoon” or “design a comics reader” is a content-and-rendering mobile system design — Webtoon, ComiXology, Crunchyroll Manga, Manga Plus, Read article
3 min read “Design a sky map app” is a sensor-and-AR mobile system design prompt — Sky Guide, SkySafari, Stellarium, Star Walk are Read article
3 min read “Design a kids’ educational app” is a regulated-industry mobile system design — Khan Academy Kids, Duolingo ABC, ABCmouse, Lingokids, Yousician Read article
3 min read “Design Ticketmaster” or “design an event ticketing app” is a senior+ mobile system design prompt that combines extreme load spikes Read article
4 min read Some engineers leave tech for entirely different careers — finance, law, teaching, medicine, the arts — and later want to Read article
3 min read Many late-career engineers and recent returnees ask the same question: “How much AI tooling do I actually need to know Read article
