Principal Software Engineer

Commonwealth Bank; Sydney; On-site; AUD 210,000 - 260,000; Full time

Job summary

Commonwealth Bank, Australia, is seeking a Principal Software Engineer within the Banker Assisted Lending crew to lead the design and delivery of scalable, secure software modernising business lending. You will shape engineering direction, stay close to code, and solve complex problems with AI‑powered engineering practices.

You will decompose monolithic apps, set architecture, translate requirements into outcomes, and mentor teams while influencing cross‑functional decisions.

Qualifications

• Senior software engineer with a track record of leading large‑scale engineering initiatives and solving complex technical challenges.
• Strong architectural judgement combined with hands‑on engineering capability and passion for modern engineering practices including AI‑assisted development.
• Experience adopting AI‑assisted engineering tools and practices.
• Ability to communicate effectively with both technical and non‑technical stakeholders.

Responsibilities

• Lead the decomposition of monolithic applications and the development of scalable microservices and event‑driven solutions.
• Set architectural direction and resolve complex technical challenges from early design through to production.
• Translate business and technical requirements into clear engineering outcomes, reusable solutions and pragmatic delivery plans.
• Make balanced decisions about technical debt, architecture, risk and commercial priorities.
• Contribute directly to code, lead technical reviews, and resolve complex production issues.
• Influence technical decisions across engineering, product and other cross‑functional teams.
• Mentor engineers, strengthen technical capability and contribute to attracting and developing engineering talent.
• Champion AI‑powered engineering practices that improve the software development lifecycle and engineering experience.

Skills

Architectural leadership

Hands-on coding

Cross-functional collaboration

Mentorship

AI‑assisted engineering

Tools

AWS

Kafka

EventBridge

SQS/SNS

GitHub Actions

Terraform

Claude Code

Codex

Cursor

Harness Engineering

Job description

• Lead the design and delivery of scalable, secure and resilient software that modernises business lending.
• Shape engineering direction while staying close to the code, complex problem-solving and technical delivery.
• Apply modern cloud, event-driven and AI-powered engineering practices to help build the future of business banking.

• Lead the design and delivery of scalable, secure and resilient software that modernises business lending.
• Shape engineering direction while staying close to the code, complex problem-solving and technical delivery.
• Apply modern cloud, event-driven and AI-powered engineering practices to help build the future of business banking.

Do Work That Matters

Technology is central to how CommBank delivers exceptional customer experiences, security, reliability and innovation. Within Business Banking Technology, we partner with the business to solve real‑world problems through modern engineering, resilient platforms, data and AI-driven insights.

As a Principal Software Engineer in our Banker Assisted Lending crew, you’ll help shape the engineering roadmap and create differentiated banker experiences that deliver greater value for our business customers. You’ll provide hands‑on technical leadership across complex initiatives, guiding solutions from design through to production while embedding scalability, security and reliability.

See yourself in our team

Be part of a team that's passionate about helping Australian businesses succeed. In CommBank's Business Banking team, you'll partner with customers to support their ambitions, backed by market‑leading technology, a collaborative culture and opportunities to grow your career.

Business Lending Technology enables customers to grow and invest through market‑leading lending and leasing products. Our solutions are underpinned by adaptive technology, robust processes and sound risk management. We partner closely with the Business Bank to deliver innovative experiences and improve our lending and leasing platforms.

In this role, you will:

• Lead the decomposition of monolithic applications and the development of scalable microservices and event‑driven solutions.
• Set architectural direction and resolve complex technical challenges from early design through to production.
• Translate business and technical requirements into clear engineering outcomes, reusable solutions and pragmatic delivery plans.
• Make balanced decisions about technical debt, architecture, risk and commercial priorities.
• Contribute directly to code, lead technical reviews, and resolve complex production issues.
• Influence technical decisions across engineering, product and other cross‑functional teams.
• Mentor engineers, strengthen technical capability and contribute to attracting and developing engineering talent.
• Champion AI‑powered engineering practices that improve the software development lifecycle and engineering experience.

We’re interested in hearing from people who:

You are a highly experienced software engineer with a track record of leading large‑scale engineering initiatives and solving complex technical challenges. You combine strong architectural judgement with hands‑on engineering capability and are passionate about helping teams adopt modern engineering practices, including AI‑assisted development.

We're looking for experience across several of the following:

• Strong engineering expertise in one or more of C#, .NET, Go or Java.
• Experience designing data‑intensive, API‑led, microservices, serverless or event‑driven systems.
• Cloud engineering experience with AWS, including serverless services and container orchestration.
• Experience with eventing technologies such as SQS, SNS, EventBridge or Kafka.
• Knowledge of automated delivery and infrastructure practices using technologies such as GitHub Actions and Terraform.
• Strong understanding of observability, site reliability engineering, CI/CD, automated testing and secure‑by‑design engineering.
• Experience applying AI‑assisted engineering tools and practices such as Claude Code, Codex, Cursor, Harness Engineering or specification‑driven development.
• Demonstrated ability to mentor engineers, influence technical direction and communicate effectively with both technical and non‑technical stakeholders.

Working with us

At CommBank, we're committed to creating an accessible, inclusive and respectful workplace. If you require support or adjustments, please let us know. We welcome applications from people of all backgrounds and we're particularly committed to making a positive difference for Aboriginal and/or Torres Strait Islander Peoples. For support, please contact 1800 989 696.

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