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The Framework

design-frameworksystem-designframeworkrequirementstradeoffs

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Full lesson · 8 learning steps Open any exercise for focused practice

Step 1 of 8 · intro card

Learn The Framework

Design Interview

A system design interview follows a repeatable arc: clarify requirements, estimate scale, sketch a high-level design, deep-dive one component, then discuss bottlenecks and tradeoffs. Think out loud and confirm assumptions instead of jumping straight to a solution.

The framework gives you structure under pressure. First clarify the functional requirements (what the system must do) and the non-functional ones (scale, latency, availability), then turn them into rough numbers — users, queries per second, storage.

With the scope agreed, sketch a high-level design: clients, services, databases, and the data flow between them. Only then deep-dive a single component the interviewer cares about, designing its schema, API, or core algorithm in detail.

Finish by naming bottlenecks and the tradeoffs you made. Throughout, think out loud and confirm assumptions — the interviewer is grading your reasoning, not a single right answer.

Clarify functional and non-functional requirements first.

Estimate scale before drawing boxes.

Deep-dive one component, then discuss tradeoffs.

framework:
  step1: clarify-requirements
  step2: estimate-scale
  step3: high-level-design
  step4: deep-dive-components
  step5: bottlenecks-tradeoffs

Read the implementation

Connect each part of the code to the concept before you type.

1. Clarify first

Start by clarifying functional and non-functional requirements before designing anything.

step1: clarify-requirements

2. Estimate scale

Back-of-the-envelope numbers (users, QPS, storage) shape every later decision.

step2: estimate-scale

3. High-level design

Sketch the major components and their data flow before drilling into any one.

step3: high-level-design

4. Deep dive

Pick one component and go deep — schema, APIs, or the algorithm behind it.

step4: deep-dive-components

5. Bottlenecks

Close by surfacing bottlenecks and the tradeoffs you accepted along the way.

step5: bottlenecks-tradeoffs

A complete learning loop

Understand

Read the concept map and follow the code breakdown.

Reconstruct

Type the implementation, repair mistakes and work through every recall exercise.

Verify

Use the final check without hints; revisit weak concepts in short practice sessions.