Senior Backend Java Developer (Microservices)

**Position Overview** We are seeking an experienced Senior Backend Java Developer with a specialised focus on microservices architecture, distributed systems, and backend engineering. In this role, you will design, build, and scale microservices-based RESTful APIs and enterprise backend components. You will focus on service communication, asynchronous messaging, optimising database interactions, and driving sound microservice design principles across the stack. **What you'll do** * Design, build, and maintain scalable microservices and distributed backend services using Java and the Spring / Spring Boot ecosystem. * Implement clean microservice architectural patterns, domain-driven design, and reusable software modules. * Author standard OpenAPI/Swagger documentation for REST endpoints and inter-service contracts. * Leverage Java concurrency utilities and asynchronous messaging to ensure efficient application performance. * Diagnose, debug, and resolve memory leaks, thread contention, and garbage collection bottlenecks in containerised environments. * Design and optimise relational and NoSQL database schemas tailored for decoupled microservices. * Manage data persistence and transactional boundaries across distributed services using Spring Data JPA. * Write tuned SQL queries, establish effective database indexing, and configure caching strategies (e.g., Redis). * Implement robust microservice resiliency patterns including Circuit Breakers, Rate Limiting, and Retry policies. * Implement standard API and service security mechanisms (OAuth2, JWT authentication, authorisation, and data sanitisation). * Build structured logging, health checks, and application metrics using standard logging frameworks. * Write clean, maintainable, modular, and unit-tested microservice code using JUnit and Mockito. * Participate in code reviews, technical architecture reviews, and maintain test coverage across application modules. **What you'll need** * 5+ years of hands-on software development experience using Java with deep knowledge of Collections, Streams API, Multithreading/Concurrency, and Exception Handling. * Strong expertise in **Spring Boot, Spring Core, Spring MVC** , and dependency injection paradigms. * Deep understanding of **microservices architecture** , distributed systems design principles, and RESTful architectural styles. * Advanced proficiency in Spring Data JPA, raw SQL query tuning, and database migration tooling. * Practical, hands-on experience with message brokers and event streaming architectures. * Solid grasp of Design Patterns, TDD/unit testing principles (JUnit, Mockito), containerization basics, and CI/CD deployment pipelines. Preferred Qualifications * Experience with service mesh technologies and cloud-native observability tools. * Familiarity with major cloud platforms and managed container orchestration services. * Experience with caching layers, distributed synchronization, and event-driven patterns.