Senior Software Engineer (C/C++)

Octagon Group; Stevenage; Hybrid; GBP 70,000 - 100,000; Full time

Job summary

Octagon Group in Stevenage is seeking a Senior Software Engineer (C/C++) to join our hybrid R&D team. You will design, develop, and maintain backend software with end-to-end ownership, collaborating with product, sales, and marketing to translate real-world requirements into high-performance solutions.

Ideal candidates have 5+ years in software development, strong C/C++ in Linux, and experience in network programming and multithreading, plus Python knowledge and mentoring skills.

Qualifications

• Degree in Computer Science, Software Engineering, or similar.
• 5+ years of software development experience.
• Strong C/C++ programming in Linux with GNU tools.
• Experience with network programming and multithreading.
• Proficiency in Python.

Responsibilities

• Design, develop, and maintain complex backend software with end-to-end ownership.
• Translate requirements into scalable, maintainable system designs.
• Contribute to system architecture and ongoing product evolution.
• Develop high-quality, performant software to agreed timescales.
• Collaborate with product owners and cross-functional teams.
• Mentor and support junior engineers; support testing and quality activities.

Skills

C/C++ programming

Linux environment

Network programming

Multithreading

Python

Mentoring

Communication skills

Problem solving

Education

Degree in Computer Science or Software Engineering

Tools

Jenkins

GitHub Actions

Docker

AWS

Terraform

Job description

Senior Software Engineer (C/C++) - Stevenage

Hybrid (UK) - Stevenage

A leading technology company developing cutting-edge test & measurement solutions for global networks is looking for a Senior Software Engineer (C/C++) to join its growing R&D team.

You’ll be part of a collaborative, multi-disciplinary environment, working closely with product, sales, and marketing teams to turn real-world customer requirements into high-performance, innovative software solutions. This is a fantastic opportunity to work on complex systems within a fast-paced, product-focused environment.

The Role - Senior Software Engineer (C/C++) - Stevenage

• Design, develop, and maintain complex backend software solutions with full end-to-end ownership
• Translate high-level requirements into scalable, maintainable system designs
• Contribute to system architecture and ongoing product evolution
• Develop high-quality, performant software to agreed timescales
• Collaborate closely with product owners and cross-functional teams
• Support testing and quality-focused activities to ensure excellent product delivery
• Mentor and support junior engineers within the team

Key Skills & Experience - Senior Software Engineer (C/C++) - Stevenage

• Degree in Computer Science, Software Engineering, or similar
• 5+ years’ experience in software development
• Strong C/C++ programming and object-oriented design skills
• Experience working in a Linux environment (GNU tools such as gcc, gdb)
• Network programming and multithreading experience
• Python programming knowledge
• Proven ability to break down complex problems and deliver solutions
• Experience mentoring or supporting other engineers
• Strong communication and collaboration skills

Desirable Experience - Senior Software Engineer (C/C++) - Stevenage

• CI/CD pipeline development (Jenkins, GitHub Actions)
• High-performance or real-time systems development
• DPDK experience
• Docker and containerisation
• Cloud technologies (AWS, Terraform)
• JavaScript knowledge