Senior Developer, C#, React Native

System C

Senior Software Developer for System C's CIS Oncology product suite, focusing on hands-on software development and mentoring. Ensuring reliable delivery and strong engineering practices in healthcare technology.

Posted 6/9/2026full-timeBelfast • 🇬🇧 United KingdomSenior💰 £45,000 - £55,000 per yearWebsite

Tech Stack

Tools & technologies

ASP.NETJavaScript.NETReactReact NativeSQL

About the role

Key responsibilities & impact

Design, develop, and maintain software within the CIS Oncology (ChemoCare) product suite.
Own complex features or technical areas from design through implementation, testing, and release.
Make informed technical decisions, escalating risks or trade offs when appropriate.
Contribute to the technical direction of the product, balancing near term delivery with long term maintainability.
Work closely with QA colleagues to support effective testing, defect resolution, and overall product quality.
Write clear, maintainable, and well tested code in line with agreed development standards.
Review code written by others and provide practical, constructive feedback.
Support and mentor less experienced developers as part of day to day team working.
Provide shared third line support, investigating and resolving complex production issues when required.

Requirements

What you’ll need

Significant commercial experience operating as a senior software developer
Strong professional experience with C#
Experience contributing to or supporting a mobile application built with React Native
Experience with modern web development, including JavaScript and CSS
A track record of designing and building maintainable software in a team environment
Experience working with complex or long lived codebases
Confidence contributing to technical design and making thoughtful trade offs
Experience reviewing code and supporting quality through good development practices
Nice to have: Experience building and maintaining ASP.NET MVC applications. SQL Server experience, including writing and optimising SQL for production systems. Experience using GitHub for source control and collaboration.

Benefits

Comp & perks

Flexible benefits
Strong focus on professional development

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

C#React NativeJavaScriptCSSASP.NET MVCSQL ServerSQL optimizationcode reviewsoftware designmaintainable software

Soft Skills

technical decision makingmentoringcollaborationconstructive feedbackproblem solvingrisk managementcommunicationteamworkdefect resolutionquality assurance