Senior Modeller

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

Benefits offered by this job

Holiday & wellbeing leave

Additional leave options

Banking benefits

Career growth

Parental leave top up

School holiday subsidy

Volunteer days

Job summary

Westpac New Zealand is seeking a Senior Modeller to join the Quantitative Risk Management team. You will apply your quantitative expertise to shape credit risk profiles across portfolios and strengthen modelling practices.

You will develop and monitor PD, EAD and LGD models, support stress testing and scenario analysis, and collaborate with stakeholders to deliver high-quality modelling outcomes and governance.

Qualifications

• A tertiary qualification in Statistics, Mathematics or a related field.
• Proficiency in SAS, SQL, R or Python with willingness to learn new tools.
• Strong analytical and problem-solving skills.
• Ability to write clear technical documentation and communicate findings to senior stakeholders.
• Attention to detail and willingness to challenge processes.
• Collaborative approach and ability to manage timelines with others to resolve blockers.
• Familiarity with Basel, RBNZ PRA, APRA or IFRS is advantageous but not essential.

Responsibilities

• Develop and enhance PD, EAD and LGD credit risk models.
• Monitor model performance and develop supporting tools.
• Support stress testing, scenario analysis, benchmarking and model reviews.
• Contribute to model governance, validation and regulatory reviews.
• Share expertise and help grow modelling capability across QRM.
• Improve analytics practices, coding, documentation and data visualization.
• Challenge existing processes to improve efficiency, accuracy and quality.
• Collaborate with stakeholders to move projects forward and deliver quality outcomes.

Skills

Proficiency in SAS

Proficiency in SQL

Proficiency in R

Proficiency in Python

Quantitative modelling

Education

Tertiary qualification in Statistics

Tertiary qualification in Mathematics

Job description

Mō te tūranga | About the Role

We’re looking for a Senior Modeller to join our Quantitative Risk Management (QRM) team, applying your quantitative expertise to help shape Westpac’s credit risk profile and strengthen how we understand and manage risk.

You’ll work across retail and non-retail portfolios, collaborating with teams across the bank to deliver high-quality modelling outcomes and strengthen best practice. You’ll also bring your expertise to wider modelling projects, work closely with stakeholders across the bank and help grow modelling capability and best practice across QRM.

In this role, you’ll:

• Develop and enhance Probability of Default (PD), Exposure at Default (EAD) and Loss Given Default (LGD) credit risk models.
• Monitor model performance and develop supporting tools.
• Support stress testing, scenario analysis, benchmarking and model reviews.
• Contribute to model governance, validation and regulatory reviews.
• Share your expertise and help grow modelling capability across QRM.
• Improve practices across analytics, coding, documentation and data visualisation.
• Challenge existing processes to improve efficiency, accuracy and quality.
• Collaborate with stakeholders to keep projects moving and deliver quality outcomes.

Nā tāu rourou | What will you bring?

You’ll bring a strong quantitative mindset and enjoy using data and modelling to solve complex problems and deliver practical insights.

Ideally, you’ll have:

• A tertiary qualification in Statistics, Mathematics or a related field.
• Proficiency in at least one analytical programming language such as SAS, SQL, R or Python, with the ability and willingness to learn new tools.
• Strong analytical and problem-solving skills.
• The ability to write clear technical documentation and confidently communicate your findings to senior stakeholders.
• Strong attention to detail and the confidence to constructively challenge.
• A collaborative approach and the ability to proactively manage timelines and work with others to resolve blockers.
• Familiarity with regulatory frameworks such as the Basel Accord, RBNZ Banking Prudential Requirements, APRA Prudential Standards or IFRS would be an advantage, but isn’t essential.

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!

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:

6 November 2026