Java Microservices API Developer

Hong Kong Unison Limited; Singapore; On-site; SGD 180,000 - 260,000; Full time

Job summary

Unison Consulting, a Singapore-based technology services provider, seeks a skilled Java Backend Developer to design, develop, and maintain scalable backend services, APIs, and microservices in a cloud-native AWS environment.

You will build robust backends, integrate with MuleSoft and Okta, deploy on AWS, and contribute to CI/CD pipelines, ensuring secure, high-performing systems for enterprise clients.

Qualifications

• 7+ years of Java backend development experience.
• Strong hands-on experience with Java 17+ & Spring Boot 3.x.
• Experience with Microservices, REST/GraphQL APIs.
• 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.

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.

Skills

Java

Java 17+

Spring Boot 3.x

Microservices

REST/GraphQL APIs

CI/CD

GitLab

AWS

IaC

SQL/Oracle

Okta

MuleSoft

Docker

Kubernetes

Cloud security

Monitoring

Tools

GitLab

AWS CodePipeline

CodeCommit

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.
• 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

Unlock job insights

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Unison Consulting established in the year 2012 in Singapore. We provide technology consulting, systems implementation, and integrations service to Asia Pacific customers. We help transform enterprise data in actionable insights. Our consultants have wide range of functional expertise within Banking and Financial services spectrum, working closely with clients to anticipate, illuminate and overcome complex business challenges.

Our objective is to be a one‑stop solution provider all enterprise business intelligence and data warehousing needs of organizations.

Our mission is to consistently deliver our services to our clients in a cost‑effective way without compromising the quality.

Our current clients include - DBS, OCBC, Standard Chartered Bank and Maybank.

Unison Consulting established in the year 2012 in Singapore. We provide technology consulting, systems implementation, and integrations service to Asia Pacific customers. We help transform enterprise data in actionable insights. Our consultants have wide range of functional expertise within Banking and Financial services spectrum, working closely with clients to anticipate, illuminate and overcome complex business challenges.

Our objective is to be a one‑stop solution provider all enterprise business intelligence and data warehousing needs of organizations.

Our mission is to consistently deliver our services to our clients in a cost‑effective way without compromising the quality.

Our current clients include - DBS, OCBC, Standard Chartered Bank and Maybank.