Design a Mobile Crowdsourced Traffic App: Waze-Style
3 min read Waze is a fascinating mobile system design topic — millions of users producing real-time GPS pings, manual incident reports, and […] Read article
Mobile System Design, System Design
Mobile System Design, System Design
Design a Mobile Health Tracker: Apple Health and HealthKit Integration
3 min read Mobile health apps work with sensitive personal data — heart rate, sleep, steps, weight. The interview tests whether you understand Read article
Mobile System Design, System Design
Design a Mobile 2FA Authenticator: Storage, Sync, and Security
2 min read A mobile authenticator app is a small surface with disproportionately strict requirements. The user trusts it with the second factor Read article
Mobile System Design, System Design
Design a Mobile Podcast App: Streaming, Downloads, and Playback State
2 min read Designing a mobile podcast app is a deceptively rich system design exercise. Audio streaming with prefetch, offline downloads with smart Read article
Frontend Engineering
Module Federation and Micro-Frontends: When and How
3 min read Micro-frontends are the architectural pattern of splitting a large web application into independently developed and deployed pieces. Module Federation (Webpack Read article
Frontend Engineering
Frontend Testing Strategy: Unit, Integration, and End-to-End
3 min read Frontend testing has matured significantly — Jest is sometimes replaced by Vitest, Cypress and Playwright dominate E2E, and React Testing Read article
Frontend Engineering
Modern React Patterns: Hooks, Context, and Server Components
3 min read React in 2026 is significantly different from React in 2020. Server Components, Suspense for data fetching, concurrent rendering, and useTransition Read article
Frontend Engineering
Build a Calendar Component: Date Picker, Range, and Recurrence
3 min read “Build a date picker” or “build a calendar component” is a deceptively hard frontend interview question. It exposes whether you Read article
Frontend Engineering
Build a Virtualized Autocomplete: Large Lists with Smooth Scroll
4 min read “Build a virtualized autocomplete” extends the search-as-you-type question to handle large datasets — 10,000 countries, 100,000 products, or any list Read article
Frontend Engineering
Build a Search-as-You-Type Input: Debouncing, Cancellation, Edge Cases
4 min read “Build a search-as-you-type input” is one of the most common frontend interview questions. It tests whether you understand debouncing, race Read article
Engineering Manager
Hiring Senior Engineers: Why It Is Different
3 min read Hiring junior engineers is process-heavy and noisy. Hiring senior engineers (Senior, Staff, Principal) is process-light and high-stakes. The bar is Read article
Engineering Manager
EM Strategy and Roadmap: Multi-Quarter Planning for Engineering Teams
3 min read “What would you tell us about your team’s strategy?” is a question that catches many EMs off guard. Operational managers Read article
Engineering Manager
Building a Strong Code Review Culture
3 min read Code review is one of the highest-leverage engineering rituals. Strong code review cultures produce better code, faster onboarding, more mentorship, Read article
Engineering Manager
Production Incident Management: An EM’s Playbook
3 min read How an engineering manager handles production incidents shapes the team’s reliability culture for years. Incidents are also a reliable interview Read article
Engineering Manager
Career Growth Conversations: Helping Engineers Grow
4 min read The career growth conversation is one of the most impactful things an EM can do, and one of the most Read article
