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Unison Group

Singapore / Global

Senior Java Backend Developer

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.

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