Senior C# ASP.NET Developer

Description At System C, we create technology that connects care and improves outcomes across the NHS. Our CIS Oncology (ChemoCare) product plays a critical role in supporting chemotherapy treatment management nationwide, and we are continuing to invest in its safety, quality, and long-term evolution. The Senior Developer role sits within the CIS Oncology product suite (ChemoCare), which supports the management of chemotherapy treatment across the NHS. ChemoCare is a market leading product in its field, with a forward looking programme of work to ensure it continues to provide safe, effective, and valued support to NHS customers. This is a senior individual contributor role, intended for an experienced developer who enjoys hands on work. The role supports reliable delivery, good engineering practice, and ownership of more complex areas of the product. What You Will Do Designing, developing, and maintaining software within the CIS Oncology (ChemoCare) product suiteOwning complex features or technical areas through design, implementation, and handover into testing and releaseMaking technical decisions and escalating risks or trade-offs where needed.Contributing to the technical direction of the ChemoCare product suite, balancing near term delivery with longer term maintainabilityWorking closely with the QA team to support effective testing, defect resolution, and overall product qualityEnsuring code is clear, maintainable, and appropriately tested, in line with agreed development standardsReviewing code written by others and providing practical, constructive feedbackSupporting and mentoring less experienced developers as part of normal team workingProviding 3rd line support (as part of a shared team responsibility) for the ChemoCare product, including investigation and resolution of complex defects where required What You Will Bring Strong professional experience with C# and ASP.NET MVCStrong SQL Server experienceExperience in developing with for the web: JavaScript, HTML, CSSKnowledge of principles of writing mobile apps and deployment on apple and android app storesExperience using GitHub for source control and collaborationStrong analytical and problem-solving skills both at a strategic and tactical levelExperience working with complex or long-lived codebasesConfidence contributing to technical design and making informed trade-offsA pragmatic, calm approach when dealing with ambiguity or pressureClear communication, including explaining technical constraints to non-technical stakeholdersSignificant commercial experience operating at senior developer level in both back-end and front-end areas Nice to have Experience with React Native or React, or equivalent frameworksExperience in writing automated unit tests using NUNITGood understanding of waterfall, agile and scrum development methodologies, and their practical application.Experience in .NET 10 and other latest technologies including AI integrationExperience in TypeScript Why join System C? You will work on software that genuinely matters, alongside people who value collaboration, ownership, and integrity. We support flexible working, encourage reflective practice, and value those who are comfortable navigating change while keeping quality and patient safety at the forefront. Apply today and help us continue to deliver technology that supports better care across the NHS.