Principal Software Engineer (.NET)Your new companyYou'll be joining a well-known financial services organisation investing heavily in up-to-date, cloud-native engineering. The technology function operates in fully onshore Sydney-based squads, combining enterprise scale with a product-led, delivery-focused mindset.
Your new roleThis is a 6-month contract opportunity for a fully hands-on Principal Software Engineer to work on a brand-new clearing and settlement platform built from the ground up. The work is genuinely greenfield, with a strong focus on resilience, scalability, and speed to market.You'll contribute across the full engineering lifecycle, primarily working with C#/.NET on backend services and modern data platforms such as PostgreSQL and cloud-hosted databases. Engineers with full-stack capability are welcomed, and there is scope for strong frontend contributors to work on React-based trading and order management interfaces.The team operates with full end-to-end ownership - engineers design, build, test, and deploy their own solutions. You'll also be hands-on with DevSecOps practices, embedding security and operational excellence into everything you deliver.There is no fixed project end date, with strong potential for extensions and longer-term opportunities.




What you'll need to succeedTo thrive in this role, you'll bring:
Strong experience building systems in C#/.NET
A background in designing scalable, highly resilient platforms
Experience working on greenfield or fast-moving product builds
Exposure to PostgreSQL or similar modern data technologies
Hands-on involvement in DevSecOps and CI/CD practices
Frontend experience with React (beneficial but not essential)
A mindset geared toward ownership, accountability, and quality
Experience across both startup-style environments and large organisations will be highly regarded.
What you'll get in returnYou'll secure a high-impact contract based in Sydney, working on a mission-critical platform using modern tools and practices. This role offers meaningful technical ownership, strong team collaboration, and the chance to contribute to a long-term program with extension and permanent opportunities available.
If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or call us now.
If this job isn't quite right for you, but you are looking for a new position, please contact us for a confidential discussion on your career.
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📌 Principal Software Engineer (.Net) (Sydney)
🏢 Hays
📍 Sydney