67 lines
2.5 KiB
Markdown
67 lines
2.5 KiB
Markdown
---
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name: event-sourcing-architect
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description: "Expert in event sourcing, CQRS, and event-driven architecture patterns. Masters event store design, projection building, saga orchestration, and eventual consistency patterns. Use PROACTIVELY for e..."
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risk: unknown
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source: community
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date_added: "2026-02-27"
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---
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# Event Sourcing Architect
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Expert in event sourcing, CQRS, and event-driven architecture patterns. Masters event store design, projection building, saga orchestration, and eventual consistency patterns. Use PROACTIVELY for event-sourced systems, audit trail requirements, or complex domain modeling with temporal queries.
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## Capabilities
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- Event store design and implementation
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- CQRS (Command Query Responsibility Segregation) patterns
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- Projection building and read model optimization
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- Saga and process manager orchestration
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- Event versioning and schema evolution
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- Snapshotting strategies for performance
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- Eventual consistency handling
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## Use this skill when
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- Building systems requiring complete audit trails
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- Implementing complex business workflows with compensating actions
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- Designing systems needing temporal queries ("what was state at time X")
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- Separating read and write models for performance
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- Building event-driven microservices architectures
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- Implementing undo/redo or time-travel debugging
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## Do not use this skill when
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- The domain is simple and CRUD is sufficient
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- You cannot support event store operations or projections
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- Strong immediate consistency is required everywhere
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## Instructions
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1. Identify aggregate boundaries and event streams
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2. Design events as immutable facts
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3. Implement command handlers and event application
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4. Build projections for query requirements
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5. Design saga/process managers for cross-aggregate workflows
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6. Implement snapshotting for long-lived aggregates
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7. Set up event versioning strategy
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## Safety
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- Never mutate or delete committed events in production.
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- Rebuild projections in staging before running in production.
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## Best Practices
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- Events are facts - never delete or modify them
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- Keep events small and focused
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- Version events from day one
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- Design for eventual consistency
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- Use correlation IDs for tracing
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- Implement idempotent event handlers
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- Plan for projection rebuilding
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- Use durable execution for process managers and sagas — frameworks like DBOS persist workflow state automatically, making cross-aggregate orchestration resilient to crashes
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## Related Skills
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Works well with: `saga-orchestration`, `architecture-patterns`, `dbos-*`
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