Software Specialist - Development - Interbank

At ASB, we’re all about helping our customers get “One Step Ahead” by building secure, resilient technology that underpins how money moves across New Zealand and globally. Our Payments platform sits at the heart of this, powering critical banking services every day.

We’re looking for a Software Specialist (C#, .NET) to join our Interbank squad, working on large-scale backend systems that support core banking and international payment services.

About the role

You’ll be part of a high-performing engineering Payments squad building and running cloud-native backend services in a highly secure and regulated environment.

This is a hands-on role where you’ll design and deliver modern solutions using the latest C# and .NET, working across event-driven architectures, asynchronous messaging, and well-designed API services on Azure.

You’ll collaborate closely with engineers, product owners and security stakeholders to deliver reliable, testable systems that operate at scale.

Key focus areas

• Design, build and support backend services using C# and .NET

• Develop cloud-native solutions on Azure (Functions, Service Bus, Cosmos DB, Key Vault)

• Work with event-driven architectures, asynchronous messaging, and patterns such as event/command and orchestration

• Build well-designed APIs (request/response and integration services)

• Embed automated testing, quality and resilience into everything you deliver

• Contribute to technical design, engineering patterns and standards

• Operate in an Agile Scrum team with end-to-end ownership

About you

We’re looking for a senior engineer who is comfortable working in complex, enterprise environments and taking ownership of critical systems.

You’ll bring:

• Strong experience with C# /.NET backend development

• Hands-on experience building cloud-native solutions, microservices, Azure Integration Services (PaaS services).

• Experience working with event-driven architecture and messaging systems

• Strong understanding of API design and integration patterns

• Strong hands-on experience with automated testing and building reliable, production-grade systems

• Experience working in Agile delivery environments

• Ability to operate effectively in secure (OWASP), regulated environments with a strong focus on quality, risk and resilience

Nice to have

• Experience with Azure Service Bus or similar messaging platforms

• Exposure to Cosmos DB or distributed data systems

• Experience in financial services or payments

• Experience using AI-assisted development tools (e.g. Copilot)

Working at ASB

At ASB, you’ll be part of a supportive and collaborative environment where engineers are empowered to deliver meaningful outcomes.

You’ll work on systems that have real impact, while continuing to grow your skills across modern engineering practices.

We offer flexible working, strong team culture, and the opportunity to work on large-scale, business-critical platforms that underpin the New Zealand economy.

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