An interview time plan for 45 or 60 minutes
The console shows minutes per step (first letter of each step). Optimisations gets the biggest slice because that's where depth is scored. Switch to 60 minutes: every step grows, and the total still adds up because rounding happens on the running total.
Frontend system design is planning a product's client side before building it; the RADIO steps (Requirements, Architecture, Data model, Interface, Optimisations) give you an order to follow, a time plan for a 45–60 minute interview and a shape for a real design doc.
Change the code and press Run (Ctrl+Enter). Predict what will happen first, then break it on purpose and read what changes. Your edits are saved and match the lesson page.
Ready for more? This phase has 5 hands-on exercises with automatic checks.
Practice questions
Write the code in the editor, run it, then open the model answer to compare.
Write the requirements (functional, non-functional with numbers, out of scope) for an image carousel on a product page.
Change the time-plan example so it also shows the plan as percentages next to the minutes.
Explain it without notes
Walk me through how you'd structure a 45-minute frontend system design interview.
What's the difference between functional and non-functional requirements? Give three non-functional requirements with numbers for a photo-sharing app.
Which clarifying questions would you ask before designing a frontend, and how does each answer change the design?
What do interviewers look for in a frontend system design round?
Preview
Console
Nothing logged yet.Expected console output
45 min: R 5, A 9, D 5, I 6, O 17, W 3
60 min: R 6, A 12, D 7, I 8, O 23, W 4