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JAVA Backend Developer with API Expertise

Unison Group · Singapore

Singapore · On-siteFull-TimePosted Jul 6, 2026

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Job description

We are looking for a Senior Java Backend Engineer to support and enhance our API and microservices ecosystem in a cloud-native AWS environment. This role focuses on BAU (Business-As-Usual) support, ensuring system stability, performance, and continuous improvement of backend services.

  • Provide BAU support for Java-based microservices and APIs, ensuring high availability and reliability
  • Design, develop, and maintain scalable microservices using Java (17+) and Spring Boot (3.x)
  • Manage and support cloud infrastructure on AWS (ECS, EC2, RDS)
  • Monitor system performance and troubleshoot issues using tools like Grafana and CloudWatch
  • Implement and maintain CI/CD pipelines using GitLab, AWS CodeCommit, and CodePipeline
  • Collaborate with cross-functional teams to resolve production issues and

deploy enhancements

  • Support integration with identity and access management systems (Okta)
  • Work with MuleSoft for API integrations and middleware support
  • Ensure adherence to best practices in coding, security, and performance optimization
  • Participate in incident management, root cause analysis, and continuous improvement initiatives

Requirements

  • Experience with containerization and orchestration (Docker, Kubernetes)
  • Exposure to security best practices in cloud environments
  • Familiarity with Agile/Scrum methodologies
  • Strong problem-solving and analytical skills
  • Ability to work in a fast-paced BAU support environment

ROLE PROFILE

  • Excellent communication and stakeholder management skills
  • Proactive mindset with ownership of production system
  • 8+ years of experience in Java backend development
  • Strong expertise in Java 17+ and Spring Boot 3.x
  • Proven experience in building and supporting microservices and REST/GraphQL APIs
  • Hands-on experience with AWS services: ECS, EC2, RDS
  • Experience with Infrastructure as Code (IaC)
  • Proficiency in CI/CD pipelines using GitLab, AWS CodeCommit, and CodePipeline
  • Strong knowledge of SQL, Oracle and relational databases
  • Experience with monitoring and logging tools such as Grafana and AWS CloudWatch
  • 3+ years of experience with Okta for authentication/authorization
  • 3+ years of experience with MuleSoft for API integration

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