Mō te tūranga | About the Role
As a Senior Modeller, you will develop, implement, and monitor credit risk models for both retail and non-retail portfolios, ensuring regulatory compliance and adopting advanced methodologies. You’ll provide quantitative risk expertise, lead analytical projects, mentor junior staff, and maintain high-quality outcomes within Westpac’s collaborative culture. Your work will drive best-in-class analytics, support the ‘One Westpac’ team approach, and establish best practices in analytics, coding, documentation, and data visualisation.
Key Responsibilities:
Develop, implement, and maintain credit risk models for both retail and non-retail portfolios.
Ensure models meet regulatory compliance and governance frameworks.
Conduct regular model performance monitoring and communicate key findings.
Provide technical expertise in credit risk modelling across stress testing, pricing, climate change, and decisioning.
Challenge existing processes to improve efficiency, accuracy, and quality of outputs.
Foster a high-performance culture driven by achievement, teamwork, and integrity.
Promote a ‘One Westpac’ team approach to enhance internal collaboration and a strong company culture.
Establish best practice procedures in analytics, coding, documentation, and data visualisation.
Nā tāu rourou | What will you bring?
Tertiary qualification in Statistics, Mathematics, or a related field.
Strong quantitative analysis skills with expertise in SAS, SQL, R, Python, or other relevant programming languages.
Excellent technical report writing and presentation skills with keen attention to detail.
Familiarity with Basel Accord, RBNZ Banking Prudential Requirements, APRA Prudential Standards, and International Financial Reporting Standards.
Proven ability to influence business practices and ensure adherence to risk policies.
Strong relationship-building skills to collaborate across business units.
Westpac Hei Wāhi Mahi | Working at Westpac
Immersing yourself in a supportive team environment, and receive some of the best banking, and lifestyle benefits in the market along with:
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
Career growth – we promote internal capability; we have programmes that recognise star performers
Generous parental leave – and top up government paid parental leave
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! | Apply Now!
Apply today with your CV and Cover Letter.
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 | Together Greater
Applications close:
29 November 2025
.png){kind=logo}
