Build scalable, high‑performance RESTful APIs using Java17/21 and Spring Boot3.x. Architect and implement microservices with Spring Cloud (Gateway, Config, Discovery). Implement security with Spring Security6.x (OAuth2, JWT, RBAC), including structured logging and robust error handling. Design and optimize schemas; tune queries with Spring Data JPA/Hibernate6.x for PostgreSQL/MySQL. Apply caching (Redis/Caffeine) where needed. Write unit/integration tests (JUnit5, Mockito, Testcontainers) and ensure performance/availability (health checks, DR). Drive technical governance, code quality, and adherence to architecture standards; lead root‑cause analysis for production incidents. Develop responsive UIs with Angular17+ or React, TypeScript5.x, HTML5, SCSS, and Material UI. Integrate backend APIs; handle async workflows with RxJS and adopt state management (NgRx or Signals). Ensure UI quality with unit tests (Jest/Jasmine) and end‑to‑end tests (Cypress). Deploy and op...