Principal Backend Developer

This is a career-defining role for a Principal Backend Developer who wants to be at the forefront of a growing SaaS organisation. You'll be joining a company that's scaling rapidly, building innovative products that make a real difference to its customers. This role offers the chance to take ownership of backend systems, shape best practice, and mentor the next generation of engineers., You'll provide technical leadership across backend development, ensuring systems are robust, scalable, and future-proof. Working closely with product owners, testers, and front-end teams, you'll bring engineering excellence into every decision. With a stack centred on C#, .NET, cloud services, and automation frameworks, you'll be both hands-on in coding and guiding others to deliver their best work.

Day-to-day responsibilities

• Architect and build scalable backend services in C# / .NET
• Drive adoption of clean coding practices, design patterns, and SOLID principles
• Mentor engineers, fostering a culture of growth, learning, and high performance
• Collaborate with product owners to refine requirements and translate them into technical solutions
• Integrate automation testing (Playwright) and CI/CD pipelines to ensure code quality
• Lead technical discussions, setting 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

• Strong experience developing backend systems with C# and .NET
• Deep knowledge of cloud environments (Azure preferred)
• Experience in designing APIs and microservices at scale
• Solid understanding of automation testing tools (Playwright desirable)
• Leadership experience - 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

Portfolio Payroll Ltd is acting as an Employment Agency in relation to this vacancy.