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.

Location: Hybrid – London, UK

Everfox is seeking a versatile Senior AI Software Engineer who thrives in unfamiliar codebases, learns quickly, and improves systems across diverse, fast‑moving projects. You’ll build AI‑driven features, enhance engineering workflows using modern AI tools, and work across multiple teams to deliver high‑quality, maintainable software.

Location: Hybrid – London, UK

About the role:

• Design, implement, and maintain features across varied languages, frameworks, and internal codebases.
• Add AI capabilities to products: model/API integration, prompt and context design, retrieval, orchestration, and the surrounding infrastructure (data handling, caching, error management, cost and latency controls).
• Build evaluation, automated testing, and guardrails to ensure AI behaviour is measurable and stable.
• Use and extend AI tooling and agentic workflows to improve development speed, test coverage, documentation, and reduce manual effort.
• Prototype quickly to de‑risk ambiguous or complex problems.
• Ramp up fast in unfamiliar systems—map key components, ask good questions, and contribute early.
• Work as a guest engineer in other teams’ codebases, aligning on scope, following conventions, and delivering clean, maintainable handovers.
• Share knowledge, patterns, reusable tooling, and guidance to improve engineering practices across the organization.
• Uphold high standards for quality, security, logging, testing, failure‑mode thinking, and responsible AI data handling.
• Contribute to CI/CD, automation, and developer tools where they accelerate project delivery.

Key Knowledge & Skills

• Degree in Computer Science or related field, or equivalent practical experience.
• 8 years plus professional software development experience and a record of shipping reliable software.
• Experience with agentic coding tools (e.g., Claude Code, Codex) and building custom extensions.
• Proficiency in at least one programming language and ability to become productive in others quickly.
• Solid understanding of CS fundamentals: data structures, algorithms, concurrency, networking, APIs, testing, and basic security.
• Ability to reason about unfamiliar systems, read and model codebases, and understand change impacts.
• Experience with modern AI development tooling or clear evidence of fast self‑learning in new technical areas.
• Strong communication and collaboration skills; trusted by partner teams.
• Self‑motivated, adaptable, and comfortable diving into challenging, ambiguous projects.
• If needed capable and willing to obtain Government Security Clearance.

Nice to Have

• AI/LLM integration experience (APIs, RAG, tool calling, agent frameworks, hosted or local inference).
• Background improving legacy systems through testing, refactoring, and reducing technical debt.
• Breadth across desktop, mobile, backend, or systems software.
• CI/CD experience (GitLab, Docker, Kubernetes) and Python for automation.
• Experience or interest in security‑sensitive environments.
• Awareness of usability and user experience.
• Empathy, clear communication, and ability to disagree constructively.

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 [email protected].

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