Principal Software Engineer

Salary: £53,000 - 93,000 per year

Requirements:

• Degree in a relevant discipline
• 10+ years of professional software development experience, with significant focus on C# and the .NET framework, including .NET Core/.NET 5+
• Deep expertise in designing and developing highly scalable, distributed systems, such as microservices architecture
• Experience developing web applications
• Proven experience with protocols and technologies common in communication or high-availability systems, such as TCP/IP, gRPC, and messaging services like Kafka or RabbitMQ
• Expertise in performance tuning, concurrency, and multithreading to achieve low-latency processing
• Strong understanding of security principles related to critical infrastructure
• Excellent problem-solving, communication, and technical leadership skills
• Experience with UI front-end frameworks such as WPF, MVVM, MVP, or MVC
• Experience planning software projects, including resourcing, task dependencies, and tool requirements
• Experience working in an Agile SCRUM environment
• Experience using virtual environments such as Docker
• Experience using Kotlin/Java
• Experience configuring toolchains, including CI/CD, version control, defect tracking tools, code analysis, and automated testing

Responsibilities:

• Lead the architecture, design, and implementation of high-performance, resilient, and secure communication systems using C#/.NET
• Develop robust, low-latency applications that handle high-volume data traffic, including messaging queues and real-time data processing
• Drive technical vision and strategy for the platform, ensuring alignment with long-term business goals and industry standards
• Conduct code reviews, establish coding standards, and implement continuous integration and continuous delivery pipelines
• Troubleshoot and resolve the most complex technical issues, ensuring maximum system uptime and reliability
• Mentor and guide mid-level and senior developers, fostering a culture of technical excellence and innovation
• Work alongside our software application team members on the development, integration, and maintenance of our existing web applications
• Take on sprint tasks within our Agile development process and Scrum ceremonies
• Collaborate with managers, team members, and other departments across the business

Technologies:

• .NET Framework
• C#
• CI/CD
• Docker
• Java
• Kafka
• Kotlin
• MVC
• MVVM
• RabbitMQ
• Security
• TCP/IP
• WPF
• Web
• gRPC
• microservices
• UX UI Design
• ASP.NET

More:

We are Sepura Ltd, an innovative technology company based in Waterbeach, Cambridge, and we are growing at an exciting pace. We develop complete TETRA and LTE solutions for customers across many industries and markets worldwide, supporting critical communications challenges in public safety and essential services. This is a central role within our Software Team, where no two days are typical. You will be supported by your manager and team, working in a collaborative Agile environment. After 3 months in the role, you could work 2 days from home and 3 days in the office, with the need to attend the office on an ad hoc basis when required.

last updated 35 week of 2026