Cloud Infrastructure
Design and provision cloud infrastructure with AWS-primary patterns and cloud-agnostic naming for portability.
Decision Framework
New service/workload?
├── Stateless, event-driven, <15min → Serverless (Lambda + API GW)
├── Long-running, stateful, predictable → Containers (ECS Fargate)
├── Kubernetes-native, multi-cloud → Orchestration (EKS)
└── Static content, CDN → Storage (S3 + CloudFront)
Database needs?
├── Key-value, <1ms, scale-to-zero → DynamoDB
├── Relational, complex queries → RDS/Aurora
├── Document store, flexible schema → DocumentDB
└── Cache, sessions, pub/sub → ElastiCache (Redis)
IaC approach?
├── AWS-only, type-safe → CDK (TypeScript)
├── Multi-cloud, declarative → Terraform
└── Simple, YAML → CloudFormation
When NOT to Use
- CI/CD pipelines: Use
ci-cdskill for pipeline config (CodePipeline, GitHub Actions) - Database schema design: Use
database-designskill for schema/migrations/queries - Application-level monitoring: Use
observabilityskill for application metrics/logs/traces
References
| File | Use When |
|---|---|
references/service-selection.md | Choosing between AWS compute, database, or messaging services |
references/cdk-patterns.md | Writing CDK constructs, organizing stacks, L1/L2/L3 patterns |
references/serverless-patterns.md | Building Lambda functions, API Gateway, Step Functions, event-driven |
references/container-patterns.md | ECS Fargate task definitions, service discovery, health checks |
references/iam-and-security.md | IAM policies, security groups, VPC design, least privilege |
references/storage-and-cdn.md | S3 configuration, CloudFront distributions, caching strategies |
references/database-selection.md | DynamoDB patterns, RDS/Aurora configuration, managed DB comparison |
references/cost-optimization.md | Right-sizing, reserved capacity, cost estimation, billing alerts |
Runtime Notes
- Claude Code: dispatch yokay-implementer via the Task tool with
subagent_type: "pokayokay:yokay-implementer". - Codex: there is no subagent dispatch. Execute the agent's role inline — read the corresponding
agents/yokay-<name>.mdand follow its Behavioral Defaults, Critical Rules, and Output Contract directly in the current session.