Principal Software Engineer

Role: Principal Software Engineer

Salary: 70,00080,000 DOE

Location: Cambridge

Were looking for a Principal Software Engineer to lead the design and optimisation of mission-critical communication systems. Youll 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.