Java Microservices API Developer

Unison Group; Singapore; On-site; SGD 120,000 - 180,000; Full time

Job summary

Unison Group is seeking an experienced Java Backend Developer to design, build, and scale backend services, APIs, and microservices in a cloud-native AWS environment.

You will collaborate with architects, DevOps, QA, and business teams, contribute to production support and continuous improvement, and own backend components from design through deployment. This role requires 7+ years of Java backend development and strong Spring Boot 3.x expertise.

Qualifications

• 7+ years of Java backend development experience.
• Strong hands-on experience with Java 17+ and Spring Boot 3.x.
• Experience building microservices and REST/GraphQL APIs.
• Proficiency in AWS, CI/CD, and container orchestration.
• Experience with MuleSoft, Okta, and enterprise integrations.
• Solid SQL/Oracle database skills.
• Knowledge of cloud security and monitoring.

Responsibilities

• Design and build Java-based microservices and REST/GraphQL APIs.
• Develop scalable, secure, high-performance backend solutions.
• Integrate with MuleSoft, Okta, and enterprise systems.
• Deploy and manage apps on AWS (ECS, EC2, RDS).
• Develop and maintain CI/CD pipelines using GitLab and AWS tools.
• Work with SQL/Oracle databases and optimize queries.
• Monitor and troubleshoot with Grafana and CloudWatch.

Skills

Java backend development

Microservices architecture

REST/GraphQL APIs

Cloud-native AWS

CI/CD pipelines

SQL/Oracle databases

Performance tuning

Troubleshooting

Tools

Spring Boot

MuleSoft

Okta

AWS ECS

AWS EC2

AWS RDS

GitLab

CodePipeline

CodeCommit

Docker

Kubernetes

Grafana

AWS CloudWatch

SQL/Oracle

REST/GraphQL APIs

IaC

Job description

We are looking for an experienced Java Backend Developer to design, develop, and maintain scalable backend services, APIs, and microservices within a cloud-native AWS environment.

The role will be responsible for developing robust and high-performing backend solutions, integrating with enterprise platforms and third-party systems, and continuously improving the reliability, scalability, security, and performance of backend applications. The developer will also contribute to production support, troubleshooting, and continuous improvement of existing services.

Key Responsibilities

• Design and develop Java-based microservices and REST/GraphQL APIs using Java 17+ and Spring Boot 3.x.
• Build scalable, secure, and high-performance backend solutions.
• Develop integrations with MuleSoft, Okta, and enterprise systems.
• Deploy and manage applications on AWS (ECS, EC2, RDS).
• Develop and maintain CI/CD pipelines using GitLab and AWS CodePipeline/CodeCommit.
• Work with SQL/Oracle databases and optimize queries and application performance.
• Monitor and troubleshoot applications using Grafana and AWS CloudWatch.
• Participate in production support, incident resolution, RCA, and continuous improvement.
• Collaborate with architects, DevOps, QA, and business teams throughout the SDLC.
• 7+ years of Java backend development experience.
• Strong hands-on experience with Java 17+ & Spring Boot 3.x.
• Strong experience in Microservices, REST/GraphQL APIs.
• Hands-on AWS: ECS, EC2, RDS.
• Experience with CI/CD: GitLab, AWS CodeCommit, CodePipeline.
• Experience with IaC and cloud deployment.
• Strong SQL/Oracle and relational database knowledge.
• Experience with Okta authentication/authorization.
• Experience with MuleSoft/API integration.
• Knowledge of Docker/Kubernetes is an advantage.
• Understanding of cloud security, monitoring, performance, and scalable application design.

Good to Have

• Experience with containerization and orchestration (Docker, Kubernetes)
• Exposure to security best practices in cloud environments
• Familiarity with Agile/Scrum methodologies