Principal Backend Developer (C# / .NET / Playwright)The OpportunityThis 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. The RoleYou''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 responsibilitiesArchitect and build scalable backend services in C# / .NETDrive adoption of clean coding practices, design patterns, and SOLID principlesMentor engineers, fostering a culture of growth, learning, and high performanceCollaborate with product owners to refine requirements and translate them into technical solutionsIntegrate automation testing (Playwright) and CI/CD pipelines to ensure code qualityLead technical discussions, setting direction on tools, frameworks, and approachesTroubleshoot and resolve complex technical challenges across backend servicesOptimise system performance and ensure resil