Runtime and backend: Java 21 (LTS), Spring Boot 3.5.16, Spring Cloud 2025.0.3, Gradle, Flyway 10.15.
Data: PostgreSQL 17 per service, Redis 7 with Sentinel, RabbitMQ 3.13 quorum queues, transactional outbox and DLQ replay.
Portals: Next.js 16.3.3, React 19, TypeScript 5; OpenTelemetry 1.31 to Jaeger.
Delivery: Kubernetes and Helm, Vault secrets, Prometheus and Grafana, Docker Compose for pilots.
Visualisation: Apache Superset 4 and ECharts 5 for dashboards and charts, Grafana for operations panels, Mermaid for documentation schemes and the portal diagrams.