Senior Java Microservices & API Engineer (AWS)

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

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.