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The machine coding round · designlab

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Part 5 · Module 11

The machine coding round

Master the practical low-level design interview: structured approach, end-to-end walkthroughs for parking lot, vending machine, and elevator/logger systems.

0 of 4 lessons24 min

11.1The machine coding approachUp next6m
11.2Walkthrough: parking lot6m
11.3Walkthrough: vending machine6m
11.4Walkthrough: elevator system6m
LabMachine Coding Mock: Parking Lot in 45 MinutesFinish “Anti-Patterns and Refactoring: From Smells to Clean Design” firstTimed · 45 min45m

Practice what this module teaches

Parking Lot LLDModel spots, tickets, and pricing with clear responsibilities and safe allocation.Foundation35 min Vending Machine LLDModel selection, payment, dispensing and refunds with guarded state transitions.Foundation35 min Elevator Controller LLDSeparate dispatch policy from car state and enforce movement safety invariants.Advanced

45 min

Logging Framework LLDCompose structured logging, redaction and bounded asynchronous output.Intermediate40 min