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Senior Engineer, Platform (C#) at Oak Engage. Location: Hybrid, Newcastle or Remote (UK Based). Reports to: Engineering Manager. Type: Full-time. Join Oak Engage – Where Communication Meets Connection. At Oak Engage, we’re on an exciting growth journey—backed by a major investment from NorthEdge to scale our impact and redefine the future of employee engagement. Trusted by some of the UK’s biggest brands, including Aldi, Five Guys, and ITV, we help organisations connect, engage, and empower their people through smarter, more personalised internal communication. With our next stage of expansion underway, we’re building a team of bold, ambitious thinkers ready to make their mark at a high-growth, purpose-driven SaaS company. If you’re looking to shape the future of work and grow alongside a company that’s going places, now’s the time to join Oak.. About the Role. We’re looking for a Senior Back-End Engineer with deep expertise in C#/.NET to drive the evolution of Oak’s server-side systems. You’ll take ownership of designing and delivering high-availability, high-performance services, working at the core of a product used by some of the UK’s biggest brands.. This is a strategic, hands-on role perfect for someone who enjoys solving complex technical challenges, shaping architecture, and supporting product growth at scale.. What You’ll Do. . Design and develop robust back-end services and APIs using C# and .NET Core/.NET 6+. . Optimise system performance, security, and scalability for a growing customer base. . Guide architectural decisions around microservices, data storage, and integrations. . Collaborate with product and other stakeholders to shape Oak's technical strategy and roadmap.. . Mentor junior engineers and contribute to technical best practices. . Drive automation, observability, and CI/CD maturity. . What We’re Looking For. . 5+ years in back-end development with C#/.NET and experience at scale. . Deep understanding of software design patterns, systems architecture, and secure development. . "Experience designing APIs with a strong focus on security and best practices.". . "Comfortable working with CI/CD pipelines, Docker, and cloud infrastructure; Azure experience is advantageous.". . Experience working in agile environments with modern DevOps toolchains. . Strong communicator and technical collaborator. . Company Location: United Kingdom.