* Software Engineering Fundamentals: DDD concepts, SOLID, testing (unit/integration), performance profiling, and security basics (OAuth2/JWT, OWASP Top 10).
Non-Mandatory (Nice-to-Have)
* Messaging systems: RabbitMQ, GCP Pub/Sub, or SQS/SNS.
* Observability: Prometheus/Grafana, ELK/EFK, OpenTelemetry, distributed tracing.
* Build & Infra: Maven/Gradle tuning, Helm charts, Terraform, Argo CD.
* Security: mTLS, secrets rotation, vulnerability scanning (Snyk/Trivy), supply chain security.
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