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Toppan Merrill

Senior Java Developer (Full-Stack)

Engineering

Employment

Full-time
From the employer

Full time

Level

Senior

Category

Engineering
Not doable from Austria

Country assessment

Not doable from Austria because the employer's own board marks it as not remote.

Our assessment is guidance. Confirm arrangements with the employer.

Skills mentioned in this posting

TypeScriptJavaReactNext.jsGraphQLPostgreSQLMySQLRedisKafkaKubernetesDockerTerraformAzureCI/CDObservability

Job description

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.