Senior Software Engineer

Senior Software Engineer - Server Side (C# / Worker Service / ORM) Waterlooville, Hampshire | Up to £85,000 + Benefits | Onsite | 4 day week Some projects are maintenance. Some are migrations. And then something genuinely rare comes along - a blank canvas, a serious engineering challenge, and a product deployed on military vessels around the world. A well-established international technology company is building a brand new System from scratch. The pace is fast - there's a client demo in January. You'll be among the first engineers into the UK team, with a clear expectation that early hires grow into team lead roles. The Role You'll be at the heart of the system architecture, building the server-side framework that underpins everything. Clean, modular C# using a Worker Service pattern, a reusable common framework, and direct interfaces to sensors, effectors, and external systems. Production-quality engineering where simplicity, precision and pace all matter. Stack C# / Worker Service, greenfield from scratch ORM, NHibernate / Entity Framework, SQL database design and creation DI, Unit Testing, modular 3-tier architecture Message Bus, Pub/Sub, SignalR, gRPC, TCP/IP, Sockets, Data Flow TPL Visual Studio Nice-to-have: Managed C++, defence / naval software backgroundWhat We're Looking For 6+ years C# server-side engineering experience Solid ORM, SQL databases, DI and unit testing Modular, composable architecture design - N-tier and message-based systems Experience interfacing with hardware devices or real-time data Eligible for SC security clearance Onsite in Portsmouth / Havant (circa 30-person office). 40 hours over 4 days with some flexibility. Degree in Software Engineering or related discipline preferred. Interested? This role is being managed exclusively by Spectrum IT Recruitment. Contact Daniel Sumpter, Senior Consultant, (url removed) Spectrum IT Recruitment (South) Limited is acting as an Employment Agency in relation to this vacancy