Frontend System Design: Build Discord
3 min read “Design Discord” is a senior+ frontend system-design prompt that combines real-time messaging, voice/video, presence at scale, and a large client-side […] Read article
Frontend Engineering
Frontend Engineering
Frontend Real-Time UX: Liveness, Activity, and Saving Indicators
3 min read What separates a static web app from a “live” one is rarely a single feature; it is a collection of Read article
Frontend Engineering
Build a Code Editor: CodeMirror, Monaco, and the Tradeoffs
3 min read “Build a code editor” is the meta-version of the rich-text-editor question — the same content-editable challenges plus syntax-aware features (highlighting, Read article
Engineering Manager
Roadmapping Without Product: Platform and Infra Teams
3 min read Most engineering management writing assumes a PM partner. Platform, infra, security, and developer-tools teams often do not have one — Read article
Engineering Manager
EM Time Management: Calendar Hygiene for Engineering Managers
3 min read EM calendars get out of hand fast. By the time you notice, your week is a quilt of 30-minute slots, Read article
Engineering Manager
Performance Improvement Plans (PIPs): A Detailed EM Playbook
4 min read The PIP — performance improvement plan — is one of the most consequential and most-mishandled tools an engineering manager has. Read article
Engineering Manager
EM Compensation Negotiation: When You Have an Offer
4 min read Engineering managers in 2026 negotiate offers with the same fundamental dynamics as senior ICs but with a few twists — Read article
Mobile System Design
Design a Mobile Travel Booking App: Search, Itinerary, Boarding Passes
3 min read “Design a travel booking app” combines search at scale, payment, complex itinerary management, and the unforgiving UX of “I am Read article
Mobile System Design
Design a Mobile Browser: Chrome and Safari Style on iOS
3 min read “Design a mobile browser” is a senior+ mobile-system-design prompt that probes whether you understand the platform constraints (especially iOS WebKit), Read article
Mobile System Design
Design a Mobile Public Transit App: Real-Time Transit
3 min read “Design a transit app” is a niche but technically rich mobile-system-design prompt. Citymapper, Transit, Moovit, Apple Maps Transit are the Read article
Mobile System Design
Design a Mobile Encrypted Messenger: Signal-Style End-to-End
3 min read “Design Signal” or “design an E2E messenger” is a senior+ mobile-system-design prompt that probes whether you understand modern cryptography, multi-device Read article
Frontend Engineering
Frontend Edge Computing 2026: Cloudflare Workers, Vercel Edge, Deno Deploy
4 min read “Edge computing” went from buzzword to mainstream production by 2025. By 2026 every senior frontend engineer is expected to understand Read article
Frontend Engineering
Frontend System Design: Build YouTube Watch Page
3 min read “Design YouTube’s watch page” is a senior+ frontend system-design prompt that tests how you decompose a heavy, multi-component page. Player, Read article
Frontend Engineering
Build a Notification Inbox / Activity Feed
3 min read “Build a notification inbox” is a frontend interview prompt that overlaps with comments, message threads, and feeds — but with Read article
Frontend Engineering
Build a Filter Sidebar with URL State Sync
3 min read “Build a filter sidebar” is a frontend machine-coding question that comes up in e-commerce (Amazon), SaaS dashboards (Linear, Jira), and Read article