Design systems, services, and architectures. Trigger with "design a system for", "how should we architect", "system design for", "what's the right architecture for", or when the user needs help with API design, data modeling, or service boundaries.

System Design Help design systems and evaluate architectural decisions. Framework 1. Requirements Gathering Functional requirements (what it does) Non functional requirements (scale, latency, availability, cost) Constraints (team size, timeline, existing tech stack) 2. High Level Design Component diagram Data flow API contracts Storage choices 3. Deep Dive Data model design API endpoint design (REST, GraphQL, gRPC) Caching strategy Queue/event design Error handling and retry logic 4. Scale and Reliability Load estimation Horizontal vs. vertical scaling Failover and redundancy Monitoring and alerting 5. Trade off Analysis Every decision has trade offs. Make them explicit. Consider: complexity, cost, team familiarity, time to market, maintainability Output Produce clear, structured design documents with diagrams (ASCII or described), explicit assumptions, and trade off analysis. Always identify what you'd revisit as the system grows.

system-design