Senior AI Software Engineer

Everfox; Greater London; Hybrid; GBP 77,000 - 124,000; Full time

Benefits offered by this job

Competitive benefits package

Hybrid work environment

Pension match

Job summary

Everfox is seeking a senior software engineer to architect and implement features across diverse languages and internal codebases, with a strong emphasis on AI-enabled products and measurable safety guardrails.

You will prototype quickly, integrate AI models and APIs, design prompt and context strategies, and contribute to the surrounding data handling, caching, and latency controls. Hybrid London work environment with a focus on secure, scalable delivery.

Qualifications

• Degree in Computer Science or related field, or equivalent practical experience.
• 8+ years of professional software development experience.
• Experience with agentic coding tools (e.g., Claude Code, Codex) and building custom extensions.
• CI/CD experience with GitLab and Docker; Python for automation.

Responsibilities

• 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 supporting infrastructure.
• Prototype quickly to de-risk ambiguous or complex problems; ramp up fast in unfamiliar systems.
• Work as a guest engineer in other teams’ codebases, align on scope, deliver clean handovers.
• Contribute to CI/CD, automation, and developer tools to accelerate project delivery.

Skills

Programming languages

CS fundamentals

Communication

Collaboration

Self-motivated

Security clearance readiness

Education

Bachelor's degree in Computer Science or related field

Tools

GitLab

Docker

Python

Job description

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

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. 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, ) 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: £76,900.00-123,500.00 GBP 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.

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 [e-mail]. Applicants must have the right to work in the location to which you have applied.

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.