Job Description
Role: Principal Software Engineer
Salary: £70,000–£80,000 DOE
Location: Cambridge
We’re looking for a Principal Software Engineer to lead the design and optimisation of mission-critical communication systems. You’ll shape technical direction, ensure performance and scalability, and mentor a talented development team within a growing technology business.
Key Responsibilities
* Lead the architecture and development of high-performance, secure systems using C#/.NET
* Build low-latency, scalable applications for real-time communication and data handling
* Define and implement coding standards, CI/CD pipelines and best practices
* Resolve complex technical issues to maintain system reliability
* Guide and mentor engineers to support continuous improvement
Skills & Experience Required
* Degree in Computer Science, Software Engineering or similar
* 10+ years’ experience with C# and .NET (Core/5+)
* Strong background in scalable, distributed systems (microservices)
* Experience with messaging and data technologies (Kafka, RabbitMQ, gRPC, TCP/IP)
* Skilled in performance tuning, concurrency and multithreading
* Solid understanding of security for critical systems
* Confident technical leadership and problem-solving skills
* Familiar with UI frameworks such as WPF and patterns like MVVM, MVP or MVC
Desirable
* Experience planning and managing software projects
* Agile Scrum background
* Familiarity with Docker, Kotlin/Java and CI/CD tools
Keywords
C#, .NET, Microservices, Distributed Systems, Kafka, RabbitMQ, CI/CD, WPF, Agile, Docker, Kotlin
For more info please do reach out, Sam Payne @ The One Group.