An exciting opportunity for a Senior Java Engineer to join a high-performing engineering team responsible for building Backend-for-Frontend (BFF) services within a modern digital platform.
This role focuses on developing reactive, non-blocking microservices that sit between customer-facing channels (web, mobile, third-party integrations) and downstream systems.
You will play a key role in delivering high-performance, resilient, and secure APIs that directly impact user experience at scale.
Design and build BFF services that aggregate and orchestrate downstream APIs
Tailor responses for different channels (web, mobile, conversational interfaces)
Define and evolve consumer-driven API contracts
Build services using Spring Boot 3.x, WebFlux, and Project Reactor
Apply non-blocking, asynchronous programming models
Ensure optimal handling of backpressure and concurrency
Implement resilience patterns using Resilience4j
Apply caching strategies ( Redis, Caffeine)
Optimize for low latency and high throughput
Integrate with distributed systems via REST and messaging platforms
Use Kafka or RabbitMQ for event-driven processing
Implement OAuth2 / OpenID Connect and JWT-based security
Enforce API protection, validation, and rate limiting
Develop comprehensive test coverage:
Unit testing (JUnit, Mockito)
Integration testing (Testcontainers)
Reactive testing (StepVerifier)
Contract testing
Containerise applications using Docker
Deploy via Kubernetes and CI/CD pipelines
Contribute to automation and infrastructure practices
Implement logging, tracing, and monitoring
Use tools such as Micrometer, OpenTelemetry, Prometheus, Grafana
Participate in architecture and design discussions
Conduct code reviews and enforce best practices
Mentor engineers and contribute to team growth
Strong experience in Java 17+
Deep expertise in Spring Boot and Spring WebFlux
Solid understanding of reactive programming paradigms
Experience with BFF / API composition patterns
Messaging systems ( Kafka / RabbitMQ)
Containers and cloud platforms ( Docker, Kubernetes)
CI/CD and modern DevOps practices
Redis, R2DBC, and/or NoSQL databases
6–10 years of software engineering experience
3+ years working with reactive systems
Experience in high-scale distributed environments
Exposure to regulated or security-sensitive domains
Familiarity with API gateway ecosystems
Strong engineering craftsmanship and attention to detail
Passion for reactive and scalable systems
Customer-focused mindset
Collaborative and team-oriented
Strong problem-solving ability in distributed systems
Ownership and accountability
Continuous learner with a growth mindset
Build high-impact, large-scale systems
Work with modern, cloud-native technologies
Be part of a collaborative, high-performing team
Influence architecture and engineering practices
Grow both technically and professionally
Contact rrondi@dearx.co.za or whatsapp 0826018585
DeARX Services (Pty) Ltd, established in 2001, is a South African based company focused on providing Information Technology business solutions, products and consulting to customers in various industries.
The business is structured into 2 divisions:
DeARX Resourcing: specialists in temporary and permanent recruitment.
DeARX Managed Services: delivers end-to-end systems integration solutions across a wide spectrum of technologies, with deep specialisation in cloud-native platforms, DevOps, identity management, and data integration. Our services span the full integration lifecycle—from assessment and architecture to deployment, monitoring, and support—anchored by a strong foundation in technologies such as IBM, WSO2, Apache Camel, Kubernetes, and AWS. We offer a robust integration Platform-as-a-Service (iPaaS) model, deployable across cloud and on-premise environments, enabling clients to retain control, scale flexibly, and integrate securely across hybrid infrastructures. With a proven track record of crafting pragmatic, high-performing solutions backed by automation, observability, and continuous delivery practices, we help clients unlock lasting value and innovation in their digital ecosystems
