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

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 suite

Owning complex features or technical areas through design, implementation, and handover into testing and release

Making 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 maintainability

Working closely with the QA team to support effective testing, defect resolution, and overall product quality

Ensuring code is clear, maintainable, and appropriately tested, in line with agreed development standards

Reviewing code written by others and providing practical, constructive feedback

Supporting and mentoring less experienced developers as part of normal team working

Providing 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 MVC

Strong SQL Server experience

Experience in developing with for the web: JavaScript, HTML, CSS

Knowledge of principles of writing mobile apps and deployment on apple and android app stores

Experience using GitHub for source control and collaboration

Strong analytical and problem‑solving skills both at a strategic and tactical level

Experience working with complex or long‑lived codebases

Confidence contributing to technical design and making informed trade‑offs

A pragmatic, calm approach when dealing with ambiguity or pressure

Clear communication, including explaining technical constraints to non‑technical stakeholders

Significant 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 frameworks

Experience in writing automated unit tests using NUNIT

Good understanding of waterfall, agile and scrum development methodologies, and their practical application.

Experience in .NET 10 and other latest technologies including AI integration

Experience 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.

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