Senior Java Software Engineer

Balance Recruitment and Balance Consulting; Sydney; On-site; AUD 180,000 - 260,000; Full time

Job summary

Balance Recruitment and Balance Consulting are seeking a Lead Java Software Engineer to lead backend development for a high-scale payment gateway based in Sydney.

You will design, implement, and deploy Java microservices (Java 17, Spring Boot 3.x), mentor engineers, and drive AI-assisted coding practices to improve quality and velocity.

The role emphasizes reliability, multi-region deployment, and collaboration with product and ops to maintain five-nines availability.

Qualifications

• 10+ years of backend software engineering experience with technical leadership in agile teams.
• Experience with microservices, RESTful APIs, and high-throughput transactional workloads.
• Experience migrating features across modern and legacy platforms.

Responsibilities

• Design, develop and deploy Java microservices for payment gateway.
• Lead PR reviews, mentor engineers, and drive AI-assisted coding adoption.
• Ensure five-nines availability and multi-region deployment reliability.

Skills

Backend architecture

Microservices

Java

Spring Boot

AI-assisted development

Leadership

Education

Bachelor's degree in Computer Science or Engineering

Tools

Docker

Kubernetes

Cloud Foundry

PostgreSQL

Oracle

Claude Code CLI

Git workflows

CI/CD

Job description

Join our client, a leading payment services provider, as a Lead Java Software Engineer responsible for leading backend engineering across their high-scale payment gateway. In this role, you will architect and develop Java microservices that authorise and settle card payments at massive scale, ensuring seamless, reliable transaction processing globally.

Key responsibilities include designing, developing, and deploying scalable, secure Java microservices using Java 17 and Spring Boot 3.x, managing the migration of features and traffic across modern and legacy platforms, and owning your work throughout the full software development lifecycle.

You'll set the engineering standards by performing pull request reviews, mentoring team members, and driving adoption of AI-assisted coding practices leveraging tools like Claude Code CLI to enhance code generation, refactoring, testing, and troubleshooting efficiency.

Working collaboratively with engineers, product managers, test engineers, and technical program managers, you will align technical strategies with delivery goals to maintain five-nines availability and multi-region deployment reliability.

This position requires strong experience with microservices architecture, RESTful API design, event-driven integration, and high-throughput transactional workloads with PostgreSQL and Oracle.

Proficiency with containerisation technologies such as Docker and Kubernetes, CI/CD pipelines, Git workflows, and cloud platforms like Cloud Foundry is essential.

The ideal candidate will have 10+ years of backend software engineering experience, including technical leadership within agile teams. Expertise in AI-assisted development and the ability to modernise legacy systems alongside greenfield projects is highly valued.

Technical expertise needed:

• Microservices architecture, REST/JSON, ISO 8583 payments processing
• CI/CD automation, Git-based workflows
• AI coding tools such as Claude Code CLI

Qualifications:

Bachelor's degree or equivalent practical experience in Computer Science, Engineering, or related field.

Bring your leadership, deep technical skills, and passion for innovative engineering to our client's team and play a pivotal role in shaping the future of high-scale payment processing.

Balance Recruitment is an equal opportunity employer who is committed to diversity and inclusion in the workplace, and applicants from all parts of the community are encouraged to apply for this role.