Senior Java Developer (Full-Stack)

Job Description: About the Role We're seeking a Senior Java Developer with 5+ years' experience to build high-performing, scalable enterprise portal backends, APIs, and modern React frontends. You'll develop modular services, cloud-native integrations, and headless APIs for robust, production-ready portal applications. Key Responsibilities Develop modular Java backend services (OSGi modules, Service Builder equivalents) and RESTful/GraphQL headless APIs for enterprise portals. Build responsive React frontends with client extensions consuming portal APIs and state management (Redux/Zustand). Design and optimize Postgres/MySQL databases with advanced entity-service mappings and SQL performance tuning. Implement event-driven integrations using message brokers (RabbitMQ, Kafka, Azure Service Bus) for cross-module communication. Deploy containerized portal applications with Docker/Kubernetes on Azure, ensuring high availability. Optimize performance with distributed caching (Redis, Hazelcast), low-latency APIs, and frontend bundle optimization. Collaborate across full SDLC: API contracts, modular development, frontend integration, deployment, and monitoring. Implement full-stack observability with Prometheus, Grafana, Datadog across backend services and frontend. Implement DevSecOps with automated security scanning, CI/CD pipelines for modular deployments. Must-Have Skills Backend/Portal: Java 17+, Spring Boot, enterprise portal frameworks (OSGi modules, Service Builder, modular service layers); REST/GraphQL headless APIs. Frontend: React 18+, TypeScript, hooks, component libraries (Material-UI), portal client extensions/API integration. Architecture: Microservices/modular monoliths, design patterns (CQRS, Event Sourcing, repository patterns). Agentic Coding: Proficiency with agentic AI coding assistants for rapid prototyping, refactoring complex OSGi modules, and generating tests across full-stack components. DevOps/CI-CD: Docker, Kubernetes (Helm charts), Jenkins/GitHub Actions, multi-module pipelines. Cloud: Azure (2+ years hands-on). Databases: Postgres/MySQL, JPA/Hibernate, advanced SQL, entity-service mappings. Testing: JUnit/Mockito (backend), Jest/React Testing Library (frontend), integration testing. Tools: Git, Gradle/Maven (multi-module), npm/yarn. Full SDLC experience; OWASP security for enterprise applications. Nice-to-Have Skills Kafka streaming, Next.js for portal frontends. Infrastructure as Code (Terraform for portal deployments). Advanced monitoring: Datadog, Splunk. Domain-Driven Design, legacy system integration (.NET/mainframes). Portal-specific patterns: content management, user personalization, workflow engines. Preferred Qualifications Bachelor's/Master's in computer science. Cloud/Java certifications. Toppan Merrill is the best in class partner for complex, secure communications that delivers premier technology driven solutions to more efficiently and accurately communicate mission critical content. We are: Trusted, Responsive, Expert and Human Toppan Merrill is built on what today's clients demand and tomorrow's clients require — a responsive partnership, rooted in deep market expertise, modern agile solutions built around your business needs, and a commitment to forward-thinking technology that ensures speed, precision, and accuracy. Toppan Merrill is an equal opportunity/affirmative action employer. Qualified individuals, including qualified women, minorities, individuals with disabilities and veterans, are encouraged to apply. If you need a reasonable accommodation at any time during the application process due to a disability, please contact a member of our Toppan Merrill HR at HR@ToppanMerrill.com or 1-866-432-0040.