C++ / C# Software Developer

C++ / C# Software Developer

Permanent • Full-time • Near Northampton, UK • £45,000–£60,000 DOE

Are you a skilled C++ or C# developer who wants to write software that genuinely matters? Our client builds cutting-edge security and intelligence systems used by law enforcement agencies, government bodies, and national security operations across the globe. This is a rare opportunity to work on technically challenging, high-impact software – all designed and manufactured in the UK.

Our client is looking to make more than one hire as they grow the team, so if you know someone who might also be a good fit, feel free to point them this way too.

This is deliberately a broad list of skills that are useful to our client across a range of projects. We’re not expecting any one person to have them all. If you’re a strong C++/C# developer with some of these capabilities and a genuine interest in this field, we want to hear from you – applications from developers at all levels of experience are welcome.

What you’ll be doing

• Full-stack development – building high-performance, scalable solutions across frontend and backend technologies
• Real-time programming – writing software to process and handle live incoming data streams
• Integrating products with third-party APIs
• Contributing across all phases of the software development lifecycle
• Working closely with the software team lead and QA Engineer

What we’re looking for

The essentials – you’ll need to bring:

• 5+ years of hands-on C++ and/or C# development experience
• Solid experience with SQL, HTTP, JSON, FTP and WPF
• Proven real-time programming skills – processing live, streaming data
• A sound understanding of networking protocols and the OSI model
• A genuine appetite to learn new technologies, frameworks and research areas

Bonus points if you have

You don’t need all of these – but any of the following will make your application stand out:

• VoIP/SIP/RTP/RTSP/TCP/UDP – deep working knowledge
• Experience with SS7, DIAMETER, VoLTE, SCTP or streamed video
• Unreal Engine development (C++ backend)
• CUDA and AI development
• GStreamer, FFmpeg, WebRTC and hardware-accelerated video pipelines
• MSSQL and large databases, HTML, Fluent 2
• IoT and edge-device integration, distributed systems or event-driven architecture
• Knowledge of cellular telecoms networks
• Software defined radio – Python, Matlab, DSP, IQ processing
• Experience working in an Agile team

What’s on offer

• Salary of £45,000–£60,000 depending on experience and skillset
• 33 days’ annual leave including Bank Holidays, rising to 38 days after 5 years
• Primarily office-based near Northampton, with one day per week working from home available after a settling-in period
• Travel insurance covering leisure trips for you, your partner and children
• 4% employer pension contribution, matched
• Share scheme recognising employees who consistently go above and beyond
• Free on-site parking
• Real opportunities for progression, skill development and international travel

About our client

With over two decades of experience, our client is a trusted partner to government agencies and law enforcement worldwide. They develop innovative, award-winning security and intelligence solutions spanning lawful interception, border security, counter-terrorism and technical surveillance countermeasures – all designed and built in the UK.

The culture

This is a collaborative, open and supportive team where people are given real autonomy and encouraged to take initiative. Our client operates with a fail-fast philosophy – they move quickly, learn from experience, and continuously improve. Personal development is taken seriously, with regular one-to-one manager interactions, mentoring, and access to external learning. Exceptional contributions are recognised and rewarded.

Interested?

If you have the right qualifications and experience, hold the permanent right to work in the UK, and live within a commutable distance of Northampton, we’d love to hear from you.