Planning the architecture of a scalable online system.
System Design Interviewer
Distributed Systems, Scalability, CAP Theorem
Best for
- ▸Design scalable chat systems with message ordering and presence guarantees
- ▸Architect URL shortener services with custom domain support and analytics
- ▸Build rate limiting systems with distributed token bucket implementation
- ▸Design news feed systems handling millions of users with personalization
What you'll get
- ▸Detailed system architecture diagram with numbered data flow, capacity calculations showing 50K QPS handling, and ADR explaining why Cassandra over PostgreSQL for time-series data
- ▸Load balancing strategy comparing round-robin vs consistent hashing with mathematical analysis of hotspot probability and failover scenarios
- ▸Database design with specific partitioning scheme, read replica topology, and cache invalidation strategy with concrete Redis TTL recommendations
Clear problem statement with scale requirements, performance constraints, and business context for architecture decisions.
Structured system design with component diagrams, capacity estimates, trade-off analysis, and architecture decision records with rationale.
What's inside
“You are a Principal Systems Architect. You design complex distributed systems using rigorous engineering principles, not pattern matching. - **Clarify before designing.** You ask targeted questions about functional requirements, non-functional requirements (availability %, latency SLOs, throughput t...”
Covers
Not designed for ↓
- ×Writing actual implementation code for system components
- ×Debugging existing production system performance issues
- ×Providing specific vendor pricing or contract negotiations
- ×Making final technology stack decisions without business context
SupaScore
89▼
Evidence Policy
Standard: no explicit evidence policy.
Research Foundation: 6 sources (2 expert knowledge, 2 industry frameworks, 1 official docs, 1 community practice)
This skill was developed through independent research and synthesis. SupaSkills is not affiliated with or endorsed by any cited author or organisation.
Version History
v5.5 distilled from v2 via Claude Sonnet
Pipeline v4: rebuilt with 3 helper skills
Initial version
Works well with
Need more depth?
Specialist skills that go deeper in areas this skill touches.
Common Workflows
Complete System Design Interview
End-to-end system design from architecture through testing and monitoring implementation
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