Cloud engineering and security: Infrastructure as code (Terraform, Bicep, CloudFormation), CI/CD (GitHub Actions, Azure DevOps), zero-trust network and identity design, encryption and key management (Key Vault, KMS), FinOps and cost governance, multi-cloud resilience and DR. Integration: API and integration architecture: REST, GraphQL and event streaming; Azure API Management, Logic Apps, Service Bus and Event Grid; AWS API Gateway, EventBridge, SQS/SNS and Step Functions; MuleSoft or equivalent iPaaS.