Design Driver Scheduling - System Design | WinJob

Problem Statement: Gig Driver Shift Planning

Problem Statement: Gig Driver Shift Planning for a multi-sided driver scheduling platform: ops publishes shift blocks with pay multipliers; drivers set availability and claim blocks; the optimizer aligns forecasted demand with compliance limits (max hours, breaks, market caps). Uber/Lyft/DoorDash interviews probe supply alignment and labor compliance, not CRUD calendars.

Mechanism (1)

Shift Ledger is the single writer; published blocks are immutable projections keyed by shift_id + schedule_version.

Operational signals

Watch block_fill_rate, no_show_rate, optimizer_p95_sec, schedule_publish_lag_sec, and swap_success_rate. Page when block_fill_rate drops below 85% for 20 minutes before a named peak (lunch, close-out).

javaOne Dark Pro

1 public final class ShiftCommand1 {
2   private final String shiftId;
3   private final long scheduleVersion;
4   private final String marketId;
5   private final Instant blockStart;
6   public String shiftId() { return shiftId; }
7 }

pythonOne Dark Pro

1 @dataclass(frozen=True)
2 class ShiftCommand1:
3     shift_id: str
4     schedule_version: int
5     market_id: str
6     block_start: datetime

typescriptOne Dark Pro

1 interface ShiftCommand1 {
2   shiftId: string;
3   scheduleVersion: number;
4   marketId: string;
5   blockStart: string;
6 }

Why interviewers care

Driver Scheduling interviews reward crisp scope, explicit trade-offs, and failure stories—not generic microservice diagrams.

Interview checkpoint

Name one failure story for Problem Statement: Gig Driver Shift Planning that proves you understand real outages, not happy-path diagrams.

Key Highlights

•Anchor 1-A: shift ledger owns writes
•Anchor 1-B: market-local partitions
•Anchor 1-C: compliance validator
•Anchor 1-D: block_fill_rate SLO

1	public final class ShiftCommand1 {
2	private final String shiftId;
3	private final long scheduleVersion;
4	private final String marketId;
5	private final Instant blockStart;
6	public String shiftId() { return shiftId; }
7	}

1	@dataclass(frozen=True)
2	class ShiftCommand1:
3	shift_id: str
4	schedule_version: int
5	market_id: str
6	block_start: datetime