Senior Software Engineer
Posted on Jun 11, 2026 by CV-Library
Portsmouth, Hampshire, United Kingdom
IT
Immediate Start
£70k - £85k Annual
Full-Time
Senior Software Engineer - Server Side (C# / Worker Service / ORM)
Waterlooville, Hampshire | Up to £85,000 + Benefits | Onsite | 4 or 5 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 maritime technology company is building a brand-new Integrated Maritime Management System (IMMS) from scratch in Waterlooville. The pace is real - 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 or 5 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
Waterlooville, Hampshire | Up to £85,000 + Benefits | Onsite | 4 or 5 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 maritime technology company is building a brand-new Integrated Maritime Management System (IMMS) from scratch in Waterlooville. The pace is real - 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 or 5 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
Reference: 225236572
https://jobs.careeraddict.com/post/113395507
Senior Software Engineer
Posted on Jun 11, 2026 by CV-Library
Portsmouth, Hampshire, United Kingdom
IT
Immediate Start
£70k - £85k Annual
Full-Time
Senior Software Engineer - Server Side (C# / Worker Service / ORM)
Waterlooville, Hampshire | Up to £85,000 + Benefits | Onsite | 4 or 5 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 maritime technology company is building a brand-new Integrated Maritime Management System (IMMS) from scratch in Waterlooville. The pace is real - 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 or 5 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
Waterlooville, Hampshire | Up to £85,000 + Benefits | Onsite | 4 or 5 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 maritime technology company is building a brand-new Integrated Maritime Management System (IMMS) from scratch in Waterlooville. The pace is real - 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 or 5 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
Reference: 225236572
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