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Unison Group

Singapore / Global

Java Microservices API Developer

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

Requirements

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

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