Design Virtual Event Platform - System Design | WinJob

Virtual conference problem framing and attendee journey

Design a B2B virtual event platform where organizers publish multi-day conferences with keynote stages, breakout tracks, sponsor expo booths, and algorithmic networking (speed matching). Attendees register via enterprise SSO, browse an agenda, join sessions, visit booths, and export leads for sponsors. The hard parts are coordinated join spikes at session start, fair networking matching under load, and sponsor analytics without leaking PII across tenants.

Numbers to state early

Metric A: 200K peak CCU
Metric B: 48h event window
Metric C: 12 parallel tracks

Failure and edge cases

Matcher hot shard stalls—split queue by interest tag hash to rebalance pairs. Sponsor export jobs must never block join path—async workers only. Cross-tenant moderator mistakes are prevented with namespaced consoles per organizer.

Java

javaOne Dark Pro

1 public final class EventScope {
2   private final String tenantId;
3   private final String eventId;
4  
5   public EventScope(String tenantId, String eventId) {
6     this.tenantId = tenantId;
7     this.eventId = eventId;
8   }
9  
10   public String partitionKey() {
11     return tenantId + ":" + eventId;
12   }
13 }

Python

pythonOne Dark Pro

1 @dataclass(frozen=True)
2 class EventScope:
3     tenant_id: str
4     event_id: str
5  
6     def partition_key(self) -> str:
7         return f"{self.tenant_id}:{self.event_id}"

TypeScript

typescriptOne Dark Pro

1 export interface EventScope {
2   tenantId: string;
3   eventId: string;
4 }
5  
6 export function partitionKey(scope: EventScope): string {
7   return `${scope.tenantId}:${scope.eventId}`;
8 }

Why interviewers care

Virtual Event Platform interviews reward crisp scope, explicit trade-offs, and failure stories—not generic microservice diagrams.

Interview checkpoint

Name one failure story for Virtual conference problem framing and attendee journey that proves you understand real outages, not happy-path diagrams.

Key Highlights

•200K peak CCU
•Organizer → Lobby → Stage
•Design a B2B virtual event platform where organizers publish multi-day conferences with ke

1	public final class EventScope {
2	private final String tenantId;
3	private final String eventId;
4
5	public EventScope(String tenantId, String eventId) {
6	this.tenantId = tenantId;
7	this.eventId = eventId;
8	}
9
10	public String partitionKey() {
11	return tenantId + ":" + eventId;
12	}
13	}

1	@dataclass(frozen=True)
2	class EventScope:
3	tenant_id: str
4	event_id: str
5
6	def partition_key(self) -> str:
7	return f"{self.tenant_id}:{self.event_id}"

1	export interface EventScope {
2	tenantId: string;
3	eventId: string;
4	}
5
6	export function partitionKey(scope: EventScope): string {
7	return `${scope.tenantId}:${scope.eventId}`;
8	}