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About the Role

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.

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 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.

Requirements

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

Skills

AI-driven features
Enhance engineering workflows
Modern AI tools
High-quality, maintainable software
Agentic coding tools
Custom extensions
Programming language proficiency
CS fundamentals
Data structures
Algorithms
Concurrency
Networking
APIs
Testing
Basic security
Reasoning about unfamiliar systems
Codebase modeling
Change impact understanding
Modern AI development tooling
Fast self-learning
Communication
Collaboration
Self-motivation
Adaptability
Challenging projects
Ambiguous projects
AI/LLM integration
RAG
Tool calling
Agent frameworks
Hosted inference
Local inference
Legacy system improvement
Refactoring
Technical debt reduction
Desktop software
Mobile software
Backend software
Systems software
CI/CD
GitLab
Docker
Kubernetes
Python for automation
Security-sensitive environments
Usability awareness
User experience awareness
Empathy
Clear communication
Constructive disagreement

Location

Hybrid – London, UK

Work Type

Hybrid

Experience Level

Senior
8 years plus professional software development experience

Education Level

Degree in Computer Science or related field, or equivalent practical experience

Salary/Compensations

£76,900.00-123,500.00 GBP

Benefits

Competitive annual leave
Pension match
PMI
Dental
Health cash plan
Income protection

About the Company

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.

Equal Opportunity

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.