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Senior Developer (C#, ASP.NET MVC, JavaScript) @ System C

Wolff Road, BelfastOnsiteFull-time
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About this role

Salary: £40,000 - 80,000 per year

Requirements: Strong professional experience with C# and ASP.NET MVCStrong SQL Server experienceExperience developing for the web using JavaScript, HTML, and CSSKnowledge of principles for writing mobile apps and deploying to Apple and Android app storesExperience using GitHub for source control and collaborationStrong analytical and problem-solving skills at both 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 skills, including explaining technical constraints to non-technical stakeholdersSignificant commercial experience operating at senior developer level in both back-end and front-end areasDesirable: experience with React Native or React, or equivalent frameworksDesirable: experience writing automated unit tests using NUnitDesirable: good understanding of waterfall, agile, and scrum development methodologies and their practical applicationDesirable: experience in .NET 10 and other latest technologies including AI integrationDesirable: experience in TypeScript Responsibilities: Design, develop, and maintain software within the CIS Oncology (ChemoCare) product suiteOwn complex features or technical areas through design, implementation, and handover into testing and releaseMake technical decisions and escalate risks or trade-offs where neededContribute to the technical direction of the ChemoCare product suite, balancing near-term delivery with longer-term maintainabilityWork closely with the QA team to support effective testing, defect resolution, and overall product qualityEnsure code is clear, maintainable, and appropriately tested in line with agreed development standardsReview code written by others and provide practical, constructive feedbackSupport and mentor less experienced developers as part of normal team workingProvide 3rd line support as part of a shared team responsibility, including investigation and resolution of complex defects where required Technologies: AIASP.NETAndroidC#CSSGitHubSupportJavaScriptLESSMobileMVCReactReact NativeSQLWebTypeScript More:

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 continue to invest in its safety, quality, and long-term evolution. This Senior Developer role sits within our CIS Oncology product suite and is a senior individual contributor position for an experienced hands-on developer. 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.

last updated 33 week of 2026

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