ScaleLab AI
Benchmark Arena
Practice sharper, recruiter-grade prompts that reveal senior architecture judgment under time pressure.
Staff45 minPass 84+
Design Ticketmaster for a global concert drop
Signal tested
Queueing, fairness, bot defense, hot partition control
Senior35 minPass 80+
Design Stripe webhooks at billion-event scale
Signal tested
Idempotency, replay, ordering, customer delivery SLOs
Staff50 minPass 88+
Design Google Docs collaboration
Signal tested
CRDT/OT, presence, conflict handling, offline sync
Principal60 minPass 92+
Design a multi-region banking ledger
Signal tested
Correctness, auditability, failover, consistency
Architecture review checklist
Workload
- • traffic shape
- • read/write ratio
- • peak multiplier
- • growth curve
APIs
- • idempotency
- • pagination
- • rate limits
- • schema evolution
Data
- • partition key
- • retention
- • consistency
- • backup strategy
Reliability
- • timeouts
- • retries
- • failover
- • degraded mode
Cost
- • biggest driver
- • autoscaling
- • storage tiering
- • egress control