Senior Java Backend Developer

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

Job summary

Unison Group New Zealand is seeking a Senior Java Backend Developer to design, build, and operate scalable backend services in a cloud environment using Java 17+, Spring Boot 3.x, REST APIs, and microservices.

You will deploy on AWS (ECS, EC2, RDS, CloudWatch), own CI/CD pipelines with GitLab, work with Oracle SQL, perform performance tuning, incident response, and collaborate with DevOps, QA, and product teams to deliver robust, secure solutions.

Qualifications

• 6+ years of experience in Java Backend Development.
• Proficient in Java 17+ and Spring Boot 3.x.
• Strong REST API design and microservices experience.
• Hands-on AWS experience (ECS, EC2, RDS, CloudWatch).
• Experience with GitLab CI/CD pipelines.
• Strong SQL skills with Oracle databases.
• Production support and incident management experience.
• Familiar with Agile methodologies.

Responsibilities

• Design, develop, and maintain high-performance backend applications using Java 17+ and Spring Boot 3.x.
• Develop and integrate scalable RESTful APIs.
• Build and maintain microservices-based architectures.
• Implement secure, reliable, and scalable backend solutions.
• Work with AWS services for deployment, monitoring, and troubleshooting.
• Develop and manage CI/CD pipelines using GitLab.
• Collaborate with DevOps, QA, and product owners.
• Provide production support and incident management.
• Perform code reviews, debugging, and performance tuning.

Skills

Java

Backend Development

REST API design

Microservices

AWS

CI/CD

SQL

Agile

Tools

GitLab CI/CD

Oracle SQL

Infrastructure as Code

Job description

Role Overview

We are looking for an experienced Senior Java Backend Developer with strong expertise in Java 17+, Spring Boot 3.x, REST API development, and Microservices Architecture. The ideal candidate will be responsible for designing, developing, deploying, and supporting scalable backend applications in a cloud environment. The role requires hands-on experience with AWS services, CI/CD pipelines, database technologies, and production support activities.

Key Responsibilities

• Design, develop, and maintain high-performance backend applications using Java 17+ and Spring Boot 3.x.
• Develop and integrate scalable RESTful APIs following industry best practices.
• Build and maintain applications based on Microservices Architecture.
• Implement secure, reliable, and scalable backend solutions.
• Work with AWS cloud services including ECS, EC2, RDS, and CloudWatch for application deployment, monitoring, and troubleshooting.
• Develop and manage CI/CD pipelines using GitLab and Infrastructure as Code (IaC) practices.
• Collaborate with DevOps teams to automate build, deployment, and release processes.
• Work with Oracle and SQL databases, including database design, queries, optimization, and troubleshooting.
• Perform code reviews, debugging, performance tuning, and application enhancements.
• Provide Production Support / BAU Support for business-critical applications.
• Manage incidents, perform root cause analysis (RCA), and implement permanent fixes.
• Collaborate with cross-functional teams including QA, DevOps, Product Owners, and Business stakeholders.

Required Skills & Experience

• 6+ years of experience in Java Backend Development.
• Strong hands-on experience with Java 17+.
• Extensive experience with Spring Boot 3.x.
• Strong understanding of REST API development and integration.
• Proven experience working with Microservices Architecture.
• Hands-on experience with AWS services:
  • Amazon ECS
  • Amazon EC2
  • Amazon RDS
  • Amazon CloudWatch
• Experience with GitLab CI/CD pipelines and automation.
• Knowledge of Infrastructure as Code (IaC) concepts.
• Strong SQL skills with experience in Oracle databases.
• Experience in production application support and incident management.
• Good understanding of Agile development methodologies.
• Strong analytical and problem-solving skills.

Good to Have

• Experience with container technologies such as Docker/Kubernetes.
• Knowledge of cloud security best practices.
• Experience with monitoring and logging tools.
• Exposure to enterprise-scale applications and high-availability systems.