SDFAANG L4-L5 System Design
29 Jun 2026 to 31 Oct 2026

System Design Mastery Plan for FAANG L4-L5

This is a daily operating plan. Every date has a level, a study target, a practice action, and proof that you can explain the tradeoff in an interview.

Study Dashboard

Use this page as the source of truth from the first foundation day to the final mock interview checkpoint.

125Daily actions
18Weeks
30Classic design prompts
L4-L5Target bar

Level Expectations

BasicDefine the concept, draw the flow, explain when it is used.
AdvancedChoose between alternatives, estimate scale, and design the component.
ExpertDefend failure modes, consistency, operability, cost, and migrations.

Daily Study Rhythm

LearnRead/watch only enough to explain the idea without notes.
DesignDraw APIs, data model, components, and request flow.
DefendWrite tradeoffs, bottlenecks, failure cases, and interviewer pushback answers.

Month, Week, Day Timeline

Start on Monday, June 29, 2026. Finish on Saturday, October 31, 2026. The final month is intentionally heavy on mocks and L5-style tradeoff defense.

Topic Mastery Map

These are the topic lanes the timeline trains. By the end, you should be able to connect each lane to real FAANG design prompts.

30 System Design Problems

Use these prompts for weekly mocks. For L4, finish a clean end-to-end design. For L5, lead tradeoffs, ambiguity, failure handling, and operational depth.

Readiness Scorecard

You are not done because you watched content. You are done when these gates are boringly repeatable.