Backend engineer role modernising .NET services and owning key onboarding APIs. Your new company Youll be joiningSimons engineering team within the Origination and Customer Onboarding domain,responsible for the critical services that power customer onboarding flows. Thesquad is backendheavy, 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 SeniorBackendleaning Software Engineer, you will design, build and maintain backendservices across both the legacy and modern .NET stacks. Youll work on customeronboarding APIs, participate in migration efforts to .NET 8, and manageendtoend 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 youll need to succeed Strong backend engineering capability using .NET Experience with both .NET Framework 4.8 and .NET 8 APIs Handson SQL experience, including schema design and optimisation Ability to work autonomously and make strong technical decisions Solid understanding of API design, distributed systems and backend architecture Confidence working within legacy codebases while contributing to modernisation Exposure to microservices, eventdriven patterns or messagebased systems (advantageous) Experience with Playwright or automated API testing (nice to have) Background in regulated or financial services environments (advantageous) What youll get in return Youll join ahighly trusted engineering squad where youll have ownership, autonomy and theopportunity to shape both legacy remediation and modern .NET 8 services. Youllwork on systems that have direct business impact, contribute to meaningfulmigration programs, and operate in a supportive but selfsufficient environmentthat values technical maturity, reliability and thoughtful engineeringpractices. 2980335
