Principal C# .NET Developer

Salary: £80,000 - 80,000 per year

Requirements:

• Strong experience developing backend systems with C# and .NET
• Deep knowledge of cloud environments, with Azure preferred
• Experience designing APIs and microservices at scale
• Solid understanding of automation testing tools, with Playwright desirable
• Leadership experience, including mentoring, coaching, and guiding engineering teams
• Strong problem-solving skills with an eye for performance optimisation
• Enthusiasm for delivering quality solutions in a SaaS environment

Responsibilities:

• Architect and build scalable backend services in C# / .NET
• Drive adoption of clean coding practices, design patterns, and SOLID principles
• Mentor engineers and foster a culture of growth, learning, and high performance
• Collaborate with product owners to refine requirements and translate them into technical solutions
• Integrate automation testing and CI/CD pipelines to ensure code quality
• Lead technical discussions and set direction on tools, frameworks, and approaches
• Troubleshoot and resolve complex technical challenges across backend services
• Optimise system performance and ensure resilience across platforms
• Review code and guide engineering standards across the team
• Contribute to product strategy by aligning technical roadmaps with business goals

Technologies:

• Architect
• Azure
• Backend
• C#
• CI/CD
• Cloud
• Playwright
• microservices
• ASP.NET

More:

We are a rapidly scaling SaaS organisation building innovative products that make a real difference to our customers. This is a career-defining Principal Backend Developer role for someone who wants to take ownership of backend systems, shape best practice, and mentor the next generation of engineers. You will work closely with product owners, testers, and front-end teams in a collaborative environment, using a stack centred on C#, .NET, cloud services, and automation frameworks. The Portfolio Group are acting on behalf of our client in recruiting for this position.

last updated 32 week of 2026