Backend engineer role modernising .NET services and owning key onboarding APIs. Your new company
You'll be joiningSimon's engineering team within the Origination and Customer Onboarding domain,responsible for the critical services that power customer onboarding flows. Thesquad is backend-heavy, supports a mix of legacy .NET Framework 4.8 and modern.NET 8 services, and operates with high autonomy due to limited capacity. Theenvironment is collaborative but best suited to someone confident workingindependently while contributing to ongoing modernisation initiatives.

Your new role
As a SeniorBackend-leaning Software Engineer, you will design, build and maintain backendservices across both the legacy and modern .NET stacks. You'll work on customeronboarding APIs, participate in migration efforts to .NET 8, and manageend-to-end delivery of features. The role includes working directly with SQLdatabases, troubleshooting and enhancing legacy systems, and integratingbackend services with internal frontends and platform components. While therole is predominantly backend, occasional light UI tasks may be required.

What you'll need to succeed
- Strong backend engineering capability using .NET




- Experience with both .NET Framework 4.8 and .NET 8 APIs
- Hands-on SQL experience, including schema design and optimisation
- Ability to work autonomously and make robust technical decisions
- Solid understanding of API design, distributed systems and backend architecture
- Confidence working within legacy codebases while contributing to modernisation
- Exposure to microservices, event-driven patterns or message-based systems (advantageous)
- Experience with Playwright or automated API testing (nice to have)
- Background in regulated or financial services environments (advantageous)
What you'll get in return
You'll join ahighly trusted engineering squad where you'll have ownership, autonomy and theopportunity to shape both legacy remediation and modern .NET 8 services. You'llwork on systems that have direct business impact, contribute to meaningfulmigration programs, and operate in a supportive but self-sufficient environmentthat values technical maturity, reliability and thoughtful engineeringpractices.
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📌 Mulesoft Technical Lead (Sydney)
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