Senior Software Engineer

Everfox · London · £90,000–£130,000 (stated in the posting)

Apply on the company website

Trusted Connectivity for AI-Powered Dominance.

Everfox delivers trusted connectivity to protect the world’s most critical environments and safeguard the sensitive data powering decision advantage.

Built for mission-critical operations, Everfox protects what matters most by securing how data moves, how users access it, and how threats are neutralized across every domain. We enable mission speed and secure collaboration across networks, domains, and allies, while ensuring the data powering AI and advanced analytics remains trusted and protected.

We don’t just defend systems; we deliver decision dominance.

• Our Purpose. Protect what matters most by enabling organizations to operate security in the most complex and high-risk digital environments.
• Our Vision. To be the most trusted authority in high-assurance cybersecurity, enabling secure collaboration across every domain.
• Our Belief. Security should never limit mission success – it should enable it.

Our Promise. We deliver absolute confidence in environments where failure is not an option.

Job Title: Senior Software Engineer

Location: London (2-3 days per week, hybrid in office)

Role overview

As a Senior Software Engineer on the platform team at Everfox (London), you will work as a high performance individual contributor, as well as amplifying the work of others. The platform team is responsible for embedded software running on our hardware appliances, as well as full stack on-prem web applications.

As Everfox is a defense-grade cybersecurity company, you will approach everything from a security-first perspective, and have a deep understanding of cybersecurity. The software maintained by the platform team runs on hardware-based security appliances for use in critical infrastructure and defense.

What the role entails

As a Senior Software Engineer on the platform team, you will:

• Design, implement, and maintain embedded linux software written in C++, Rust, and Python
• Ensure that our software has a high level of unit and automated test coverage
• Debug system-level issues involving multiple software and hardware components
• Lead technical work, taking requirements and breaking down into smaller tasks to achieve a goal
• Collaborate and communicate effectively within the team, and across multiple teams in the engineering org
• Document technical information clearly to enable other developers
• Enable and unblock other developers, becoming a force multiplier who improves the effectiveness of the team overall
• Leverage large language models to assist with development tasks and review work

Key responsibilities

As a Senior Software Engineer, you will be responsible for:

• Taking ownership of, and responsibility for development tasks and completing work to a high standard
• Reducing ambiguity by understanding requirements and scoping into smaller pieces of work
• Ensuring that technical information is communicated clearly
• Ensuring less senior developers on the team are not blocked
• Leveraging CI and automated testing to ensure that changes are integrated often
• Clearly highlighting and communicating any areas of project risk or uncertainty within development tasks

Qualifications

• Typically 5-7 years experience as a software engineer. However a track record of strong ability and effectiveness is what we look for - rather than number of years.
• An undergraduate degree in computer science, or a science / technology / engineering / mathematics related field.

Engineering skills

• Modern C++17 (and later) for resource-contained, security critical devices
• Experience with Rust is beneficial, but not critical for the role
• Python development for tools, test frameworks, and on-prem web services
• Debugging system level issues across a whole stack of software components
• Thorough understanding of modern cryptography and cybersecurity
• Experience designing CI workflows (automated / unit testing, GitLab, Docker)
• Experience with OS hardening or mandatory access control policy, such as SELinux, is beneficial but not critical for the role
• Experience using LLMs to assist in development, review, and testing. Experience orchestrating multiple agents to complete large development tasks is beneficial but not critical for the role

Coordination

• Proven ability to lead technical work: implement features from requirements, through to design, implementation, test, and release
• Coordinate with hardware designers, and other software teams
• Unblock and enable other developers as a force multiplier. Mentor other developers
• Clear communication is a must
• Document requirements, implementations, and specs clearly

A reasonable estimate of the base salary range for this role is:

The actual salary offered may vary within the range based on a candidates' unique experience, locale, and business needs. In addition to base salary and either bonus or commission, Everfox offers a generous benefits package including competitive annual leave, pension match, PMI, dental, health cash plan, income protection, in a hybrid work environment. Our Talent Acquisition team will provide specific information regarding salary and benefits offerings.

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Don’t meet every single qualification? Studies show people are hesitant to apply if they don’t meet all requirements listed in a job posting. If there is something slightly different about your previous experience, but it otherwise aligns and you’re excited about this role, we encourage you to apply. You could be a great candidate for this or other roles on our team.

Everfox is an equal employment opportunity employer and complies with all applicable federal, state, and local laws prohibiting discrimination. Everfox does not discriminate against any employee or applicant based on race, color, religion, sex, age, national origin, disability, veteran status, marital status, medical condition, or any other category protected by applicable law. If you are a qualified individual with a disability or a disabled veteran, you may request a reasonable accommodation if you are unable or limited in your ability to use or access the Company’s career webpage as a result of your disability. You may request reasonable accommodations by sending an email to humanresources@everfox.com.

Applicants must have the right to work in the location to which you have applied.

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