Design Fleet Management - System Design | WinJob

Problem Statement: Corporate Fleet Operations

Design Fleet Management Platform (Samsara/Geotab-class telematics) for corporate fleet management. This section covers problem statement: corporate fleet operations in the understanding phase.

Operational detail

Partition by org_id and vehicle_id so one enterprise customer cannot saturate shared ingest. State AP for live telemetry (stale drop) and CP for work orders and dispatch assignments. Quantify before naming databases.

Failure and edge cases

Gateway offline buffers replay duplicates; geocoder outage should not blank the map; maintenance cron double-fire without idempotent work_order keys; driver checkout on wrong vehicle blocked by active_assignment constraint.

Interview checkpoints

javaOne Dark Pro

1 public record TelemetryDedupeKey(String deviceId, long sampleEpochMs, int seq) {}
2 // sec-01 fleet ingest idempotency

pythonOne Dark Pro

1 def maintenance_due(odometer_mi: float, interval_mi: float, buffer: float = 500) -> bool:
2     return odometer_mi >= interval_mi - buffer  # sec-01

typescriptOne Dark Pro

1 export function isStaleTelemetry(tsMs: number, nowMs: number, maxAgeMs = 30000): boolean {
2   return nowMs - tsMs > maxAgeMs;  // sec-01
3 }

Why interviewers care

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

Interview checkpoint

Name one failure story for Problem Statement: Corporate Fleet Operations that proves you understand real outages, not happy-path diagrams.

Key Highlights

•multi-tenant B2B: fleet operators, dispatchers, drivers, mechanics
•continuous telematics: GPS, speed, engine DTCs, fuel, ignition
•maintenance lifecycle: mileage/time triggers, work orders, downtime
•dispatch & route jobs tied to vehicles and driver shifts

1	public record TelemetryDedupeKey(String deviceId, long sampleEpochMs, int seq) {}
2	// sec-01 fleet ingest idempotency

1	def maintenance_due(odometer_mi: float, interval_mi: float, buffer: float = 500) -> bool:
2	return odometer_mi >= interval_mi - buffer # sec-01

1	export function isStaleTelemetry(tsMs: number, nowMs: number, maxAgeMs = 30000): boolean {
2	return nowMs - tsMs > maxAgeMs; // sec-01
3	}