Full-Stack Craft: Login and Upload Flow

Full-stack candidates may get a craft or Karat-style discussion that starts from a user action, then walks through frontend, network, backend, database, and rendering behavior. Variants include login, submitting a ride, and uploading a profile avatar. Requirements Explain what happens after a user action such as logging in, submitting a ride, or uploading a profile avatar. Cover frontend behavior, network path, backend services, storage, and rendering. Be ready for quick checks on DNS, TLS, load balancers, database partitioning, React, and API decisions. For frontend-heavy variants, implement HTML/CSS to match a provided layout and discuss follow-ups if time remains. For avatar upload variants, discuss multiple display resolutions and how the uploaded image appears on the profile page. Notes The round is often broad but not deeply specialized; saying what you do not know cleanly is better than inventing internals. Some interviewers have keyword-like expectations and may revisit a component if the answer misses it. Preparation Practice a complete request lifecycle from click to rendered response, including browser, DNS/TLS, CDN/LB, API, auth, DB, and cache. Prepare one frontend rendering example and one backend API/data-model example from your own work.