Senior Software Engineer - backend

Westpac New Zealand Ltd; New Zealand; On-site; NZD 140,000 - 190,000; Full time

Benefits offered by this job

Wellbeing leave

Extra leave options

Banking benefits & super

Growth opportunities

Employee recognition

School holiday subsidy

Volunteer days

Job summary

Westpac New Zealand Ltd. is seeking a Senior Software Developer to design, develop and maintain scalable backend applications and API integrations.

You will bring 7+ years’ experience across backend and API development, with Java and Spring Boot, and drive architecture, performance and security improvements. Lead solution design, mentor junior developers, collaborate with cross-functional teams from concept to delivery, and document SDLC processes.

Qualifications

• 7+ years of backend and API development experience.
• Proficient in Java and Spring Boot.
• Experience with DevOps, CI/CD, containerisation and deployment automation.
• Strong knowledge of database design, transactions and queries.
• Ability to mentor juniors and lead solution design.

Responsibilities

• Design, develop and maintain scalable backend applications.
• Lead API design, performance and security best practices.
• Mentor junior developers and share knowledge.
• Collaborate with cross-functional teams from concept to delivery.
• Maintain documentation across the SDLC and support after-hours when needed.

Skills

Java

Spring Boot

API development

CI/CD

Containerisation

Deployment automation

Database design

Performance

Security

Code reviews

Testing

Tools

Git

Docker

Kubernetes

CI/CD pipelines

Job description

Mō te tūranga | About the Role

The Senior Software Developer is responsible for designing, developing, and maintaining scalable applications across back-end technologies. This role requires strong technical expertise, leadership in solution design, and collaboration with cross-functional teams to deliver high-quality software solutions that deliver exceptional digital experiences. Design, develop, test, and maintain applications and integration solutions. Troubleshoot and resolve technical issues promptly, ensuring system stability and participating in after-hours support when required. Ensure best practice in API design, coding standards, performance and security. Collaborate with project teams from concept through delivery to ensure solutions meet business and technical requirements. Provide technical guidance and mentorship to junior developers and peers. Create and maintain documentation throughout the Software Development Lifecycle (SDLC) to support transparency and knowledge sharing. Implement changes aligned with design specifications and evolving business needs. Analyse recurring issues and lead continuous improvement initiatives to enhance system performance and reliability. Maintain and refine support procedures to ensure resilience and minimize downtime. Contribute to release and deployment processes, ensuring accurate documentation and compliance with governance standards. Implement automated testing and ensure high-quality code through code reviews and continuous integration practices.

What will you bring?

We value attitude and presence as highly as technical expertise. You will also need to demonstrate exceptional influencing and communication skills, with the ability to use appropriate interpersonal styles and methods to guide individuals toward fast and effective outcomes. At least 7+ years’ experience across backend and API development. Proficiency with server-side development - Java, Spring Boot. Experienced in designing and maintaining integrations with a wide variety of applications and APIs. Experience in DevOps such as CI/CD pipelines, containerisation and deployment automation. Strong knowledge of database schema design, transactions and queries.

Westpac Hei Wāhi Mahi | Working at Westpac

In addition to immersing yourself in a supportive team environment, you'll receive some great job perks and benefits including:

• 4 weeks standard holiday + 5 additional days of wellbeing leave to support you to be your best
• Additional purchased leave options up to 4 weeks per year
• Banking benefits, insurance discounts and superannuation scheme
• Growth and development – we provide opportunities for development and promote internal mobility
• Recognition - we recognise and reward our star performers
• School holiday subsidy - help you balance work and family during school holiday
• 2 Volunteer days per year

Ko mātou tēnei | Our Organisation

At Westpac, we’re working together to build a fairer and stronger New Zealand for our people, customers, and communities. For over 160 years we’ve been driven by our purpose to Create Better Futures Together. What makes us unique are the incredible people we’re lucky enough to have walk through our doors every day. The giant ‘W’ on our building doesn’t just stand for Westpac – it says, double you. We’re a place that values, rewards and recognises individuality. Where you can be your whole self, your true self, and your best self. We’re recognised as a place where talent is developed, where passions are fuelled and where ambitions of all shapes and sizes thrive. And it all starts with you! Tono mai ināianei!

The people of Aotearoa, New Zealand hail from many cultures and backgrounds. At Westpac New Zealand, we draw on this enormous talent pool to cultivate a team rich in ability and empowered to reach its full potential. Our aim is to be brave challengers, celebrating our differences and relentlessly advocating for our customers. It starts with us – we believe that when we care deeply and do our best for our people, they’ll do their best for our customers. We encourage people from all walks of life to apply, including those who are neurodiverse, have chronic health conditions or disabilities – your attitude and passion are as important to us as your experience, qualifications and capabilities. Mahi tahi tātou, kaha ake tātou.

Mahi tahi tātou, kaha ake tātou | Together Greater

Applications close: 6 October 2026

This is reflected through flexible working arrangements to ensure that our people have a balance in their life with those things that are important to them. Through ensuring that we provide opportunities to everyone regardless of what society throws at them, we are a safe place to work where you are treated equally and appreciated.