Principal .NET Engineer

We are currently looking for a Principal .NET Engineer to join us in shaping the future of digital healthcare.

Role summary

As a Principal .NET Engineer at 6B Digital, you will play a pivotal role in leading the development of our digital solutions, with a focus on healthcare integration. You will work closely with our engineering team, project managers, and clients to design and implement robust, scalable, and secure .NET-based solutions. Your expertise will be critical in guiding the development of systems capable of helping hundreds of thousands of patients throughout the UK.

Your key responsibilities

Technical Leadership:

  • Leads a team of technical engineers and is responsible for the output in complex development projects
  • Plans and leads software construction activities for strategic, large and complex development projects
  • Ensures adherence to technical strategies and systems architectures (including security)
  • Provide technical expertise and guidance in development best practices, tools, and frameworks
  • Lead the engineering team in establishing coding standards and guidelines for development
  • Conduct code reviews to ensure adherence to coding standards, performance, and maintainability
  • Mentor and assist junior engineers, fostering their growth and development.

Solutions Activities:

  • Leads system design activities for large, complex systems
  • Ensures the engineering team are following the proposed architecture and frequently reviews this with the team
  • Documents systems for future use and development.

Quality Assurance and Testing:

  • Leads activities to manage risks and opportunities associated with testing
  • Writes maintainable unit and feature tests on projects that follow the AAA methodology
  • Promotes a culture of quality throughout 6B and drives the adoption of testing policies and standards
  • Debug and troubleshoot issues, ensuring high-quality and bug-free deliverables.

Collaboration and Communication

  • Collaborate with cross-functional teams, including designers, and delivery managers and product owners
  • Participate in project planning and estimation, providing technical insights and recommendations
  • Effectively communicate project progress, challenges, and solutions to stakeholders
  • Manages trade-offs and functional, service quality and systems management requirements within a significant area of the organisation.
  • Communicates proposed decisions to stakeholders
  • Work when required with the business development team in assisting with sales opportunities, quotes and tender applications.

Required skills

  • Extensive experience in .NET development, specifically C#, ASP.NET Core (6+) and .NET Framework
  • Previous experience working with SignalR
  • Good knowledge of Blazor or other front end frameworks
  • Usually at least 10+ years of experience being a professional engineer in the specific domain
  • Strong knowledge of software architecture, design patterns, and best practices
  • Solid understanding of RESTful APIs and asynchronous request handling
  • Experience with testing frameworks (nUnit, xUnit or bUnit) and code quality tools
  • Strong problem-solving and debugging skills with an attention to detail
  • Excellent communication and collaboration skills, with the ability to work effectively in a team environment
  • Experience with Agile methodologies (Scrum, Kanban) and project management tools (JIRA, Confluence)
  • Working with version control software such as GitHub.

Nice to haves

  • Experience with integrating with primary care EHRs including SystmOne, EMIS Web and Cegedim VisioE
  • Experience with integrating with secondary care EHRs including Cerner, Epic, AllScripts and Ri
  • Understanding of interoperability standards such as HL7 FHI
  • Knowledge of security and compliance in healthcare applications
  • Previous experience with NHS England APIs, e.g. GP Connect, NHS APP, PDS and CIS
  • Experience with Azure DevOps and service
  • Experience with static code analyser
  • Produces solution documentation, for example a DPIA, System architecture, ERDs and Dataflows.

Email your CV to to apply.

No recruitment companies please.

Benefits of working for 6B


Generous holiday entitlement

Office Treats

Regular fully subsidised lunches and breakfasts

Keeping Fit

50% subsidised gym membership

Having Fun

Regular team days out and activities


Annual appraisals and salary reviews

Easy Going

Flexible start and end times to work around your lifestyle

Flexible Workspace

Let us know what tech you need to do your job well

Distributed Working

Flexibility to work from home/a coffee shop/anywhere


Using technology for positive social benefit

Ready to accelerate your technology project?

Chat to our team of experts and let's see how we can help you.