Senior .NET Developer

Are you ready to shape the future of healthcare technology by developing secure, scalable, and high-performance backend systems? Do you thrive on building modern APIs, driving integration excellence, and delivering robust solutions within complex, regulated environments?

At Harris Health Alliance, part of the Harris Computer Group, we build mission-critical software that supports healthcare organisations worldwide.

Innovation, reliability, and engineering quality define our approach to improving patient outcomes through technology.

As a Senior .NET Developer, you will play a pivotal role in designing, developing, and maintaining secure and scalable Web API backends, as well as integration solutions built on the latest .NET technologies.

Your work will focus on delivering reliable healthcare integrations, implementing industry best practices for API security, and ensuring high performance across distributed systems.

In addition to hands-on development, you will contribute to architectural decision-making, lead technical design initiatives, and mentor team members to uphold engineering excellence and deliver high-quality software solutions.

This permanent role offers full remote flexibility, with the option to work from our collaborative offices in Chippenham, Swindon, Chester, or Plymouth.

Join a forward-thinking, inclusive, and innovative engineering team that values technical excellence, collaboration, and real-world impact.

What you will do

Your key responsibilities will include (but will not be limited to):


* Design, develop, and maintain high-performance Web API backend systems using the latest .NET (8+) and C#, with occasional frontend development.


* Participate in the full software development lifecycle, from requirements gathering and design through to deployment and maintenance.


* Develop and consume RESTful APIs that adhere to OpenAPI specifications and integrate with third-party services as required.


* Collaborate with cross-functional teams (QA, Platforms, Product) to ensure seamless delivery.


* Conduct code reviews, provide mentorship, and enforce best practices in software development.


* Optimise performance and scalability of existing systems.


* Ensure adherence to security, compliance, and coding standards.


* Troubleshoot, debug, and resolve complex technical issues in production and development environments.


* Contribute to architectural decisions and help shape technical direction.

What we are looking for


* 5+ years of commercial experience in software development, with at least 4 years of hands-on C# /.NET experience in production environments.


* Proven experience with Web API development, while experience with desktop application development would be an advantage (ASP.NET, Entity Framework, Web API, WinForms, WPF).


* Solid experience with PostgreSQL and/or SQL Server, including a strong understanding of database design principles.


* Demonstrated ability t...