Senior Software Engineer

Westpac New Zealand; Wellington; On-site; NZD 120,000 - 180,000; Full time

Benefits offered by this job

4 weeks holiday + wellbeing leave

Purchased leave options up to 4 weeks/

Banking benefits & insurance discounts

Growth & internal mobility

Recognition of top performers

School holiday subsidy

2 volunteer days

Job summary

Westpac New Zealand is seeking a Senior Software Developer – IBM Mainframe to design, develop and maintain critical IBM Mainframe applications across batch and online processing. You’ll work with cards, payments and core banking interfaces while ensuring reliability and security.

You will contribute to testing, reviews and releases, collaborate with product teams and technology specialists, and participate in after-hours support when required.

Qualifications

• Strong mainframe development experience in COBOL/CICS
• Experience with batch and online/real-time processing
• Experience with IBM MQ or enterprise messaging and system integration
• At least 5 years experience with COBOL and CICS
• Strong database, analytical and problem-solving skills
• Experience supporting business-critical production applications
• Understanding of secure development, operational resilience and risk
• Strong communication skills and collaborative approach across technology teams
• Experience in banking, cards or payments is advantageous

Responsibilities

• Design, develop, test and maintain IBM Mainframe applications and services.
• Develop and support batch, online and system integration solutions.
• Troubleshoot production issues and identify opportunities for continuous improvement.
• Contribute to testing, code reviews, releases and technical documentation.
• Work closely with engineers, product teams and other technology specialists to deliver secure and reliable solutions.
• Participate in production and after-hours support when required.

Skills

Mainframe development

COBOL

CICS

IBM MQ

Batch & online processing

Analytical problem solving

Secure development

Banking/payments familiarity

Tools

IBM Mainframe tools

Job description

Mō te tūranga | About the Role

Join our Cards & Consumer Finance Product Engineering team as a Senior Software Developer – IBM Mainframe, working on technology that supports the lifecycle of our cards and connects with key banking, card-processing and customer systems.

Mō te tūranga | About the Role

Join our Cards & Consumer Finance Product Engineering team as a Senior Software Developer – IBM Mainframe, working on technology that supports the lifecycle of our cards and connects with key banking, card-processing and customer systems.

You’ll develop, maintain and enhance our IBM Mainframe applications, working across both batch and online processing and core banking platforms. This is a great opportunity to work on business‑critical technology while helping us improve the reliability, resilience and maintainability of our cards ecosystem.

• Design, develop, test and maintain IBM Mainframe applications and services.
• Develop and support batch, online and system integration solutions.
• Troubleshoot production issues and identify opportunities for continuous improvement.
• Contribute to testing, code reviews, releases and technical documentation.
• Work closely with engineers, product teams and other technology specialists to deliver secure and reliable solutions.
• Participate in production and after-hours support when required.

Nā tāu rourou | What will you bring?

• Strong software development experience in mainframe or host-based environments.
• Experience with batch and online/real-time processing.
• Experience with IBM MQ or enterprise messaging and system integration.
• At least 5 years experience with COBOL and CICS
• Strong database, analytical and problem-solving skills.
• Experience supporting business-critical production applications.
• An understanding of secure development, operational resilience and risk.
• Strong communication skills and a collaborative approach to working across technology teams.
• Experience within banking, cards or payments would be highly advantageous.

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!

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 neurodivergent, have chronic health conditions or disabilities – your attitude and passion are as important to us as your experience, qualifications and capabilities.

Applications Close

11 November 2026