Full-Time

Software Engineer 3

Everfox

Everfox

501-1,000 employees

High-assurance cybersecurity platform for government

Compensation Overview

£59.2k - £97k/yr

+ Bonus or commission + Pension match

London, UK

Hybrid

Hybrid work in London, UK.

Bachelor's

Category
Software Engineering (1)
Required Skills
LLM
Kubernetes
Python
Software Testing
Data Structures & Algorithms
Computer Networking
Docker
RAG
DevOps

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Requirements
  • A degree in Computer Science, Engineering, or a related technical or scientific subject, or equivalent practical experience.
  • Solid commercial software development experience with a track record of shipping working software that other people rely on.
  • Strong proficiency in at least one programming language and the ability to become productive in other languages as projects demand.
  • A good grasp of data structures and algorithms, concurrency, networking, application programming interfaces and interfaces, testing, and the basics of software security.
  • The ability to read unfamiliar code, form a mental model, identify where a change belongs, and understand its knock-on effects.
  • Practical experience using modern artificial intelligence development tooling, or clear evidence of quickly learning and applying new tooling and techniques to real work.
  • Strong communication and collaboration skills.
  • The ability to work independently, flexibly, and adaptably on unfamiliar projects.
Responsibilities
  • Design, implement, and maintain features and components across internal codebases using the languages and frameworks required by each project.
  • Add artificial intelligence-driven capabilities to products, including model and application programming interface integration, prompt and context design, retrieval, tooling, agent orchestration, data handling, caching, error handling, cost and latency management, and graceful handling of unavailable or incorrect models.
  • Build evaluation and testing around artificial intelligence features so behavior is measurable and does not regress as models, prompts, and dependencies change.
  • Use artificial intelligence tooling and agentic workflows in daily development and build reusable pieces such as skills, slash commands, subagents, hooks, Model Context Protocol integrations, and per-codebase agent guidance.
  • Apply artificial intelligence tooling to raise test coverage, generate and maintain tests, improve documentation, and reduce repetitive manual work in existing codebases.
  • Prototype quickly to de-risk difficult or poorly understood problems and determine whether an approach is worthwhile.
  • Become productive quickly in unfamiliar codebases by reading code, mapping important parts, asking questions, and contributing without requiring everything to be explained.
  • Work in codebases owned by other teams, agree on scope and approach, follow conventions, and get changes reviewed and merged.
  • Work with Product Managers, Quality Assurance, and owning engineering teams to turn broad requests into well-scoped technical work with a clear definition of done.
  • Hand over cleanly at the end of each project by leaving tests, documentation, agent tooling, and sufficient context for the owning team to support and extend the work.
  • Share learning through reusable components and tooling, patterns, internal write-ups, and informal coaching on artificial intelligence tooling.
  • Keep progress, risks, and blockers visible to the line manager and collaborating teams.
  • Take responsibility for shipped quality through automated tests, code review, sensible logging, and analysis of failure modes.
  • Apply appropriate security and data-handling practices when introducing artificial intelligence components, including controlling data flows, model trust, untrusted input, and model output.
  • Contribute to continuous integration and continuous delivery, automation, and developer-tooling improvements.
  • Help establish shared standards for artificial intelligence in products and development processes and provide feedback on what works.
Desired Qualifications
  • Hands-on experience with agentic coding tools such as Claude Code, Codex, or similar tools used for real work.
  • Experience extending agentic coding tools by authoring reusable agent extensions, including Claude Code Skills, slash commands, subagents, hooks, Model Context Protocol servers, and project-level guidance files such as CLAUDE.md.
  • Experience integrating large language models or other models into production software through application programming interfaces, software development kits, retrieval-augmented generation, tool and function calling, agent frameworks, or local and self-hosted inference.
  • Experience evaluating artificial intelligence systems by building test sets and benchmarks, measuring output quality, or automating regression checks for non-deterministic behavior.
  • Experience improving an existing or legacy codebase by adding tests, refactoring safely, or reducing technical debt.
  • Breadth across more than one of desktop applications, mobile, backend services, embedded software, or systems software.
  • Continuous integration and continuous delivery experience with GitLab, Docker, Kubernetes, and Python for automation and testing.
  • Experience working in security-sensitive or high-assurance environments, or interest in doing so.
  • Technology experience demonstrated through project work, professional roles, or personal projects.
  • Awareness of usability and user experience and the ability to assess whether a feature is pleasant to use.
  • Empathy, open communication, effective feedback, and confidence disagreeing constructively with the team that owns the code being changed.

Everfox provides defense-grade cybersecurity platforms for government, defense, intelligence, and regulated sectors. It secures cross-domain data access, threat protection, and insider-risk management through Cross-Domain Solutions, Content Disarm & Reconstruction, and Insider Risk Analytics. Since acquiring Garrison Technology, it adds hardware-enforced security (hardsec) using FPGA to protect air-gapped environments and enable multi-domain access on one device. Backed by 25+ years in the field and now independent under TPG, Everfox aims to protect critical data and networks, reduce insider and external threats, and simplify secure cross-domain access.

Company Size

501-1,000

Company Stage

Seed

Total Funding

$8.1M

Headquarters

Herndon, Virginia

Founded

2023

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Simplify Jobs

Simplify's Take

What believers are saying

  • Kasm and Everfox launched cross-domain workspace access on August 20, 2026.
  • Everfox launched HSV-T and ULTRA Plus, broadening tactical and secure internet access offerings.
  • Everfox won renewed UK Armed Forces Covenant recognition and new DoD interest in August 2026.

What critics are saying

  • MCICOM intends sole-source enhancement of Insider Threat Monitoring Tool, exposing contract concentration.
  • Everfox cut about 50 jobs in November 2025, and 2026 headcount still fell.
  • Leadership turnover accelerated in 2026; Berg exited, then Wajsgras, DeSimone, O'Brien, Stevens, Mustacchio arrived.

What makes Everfox unique

  • Everfox owns hardware-enforced cross-domain security, especially HSV-T and Trusted Thin Client.
  • Its products move classified data at mission speed, proven during Rhino Bizz, August 2026.
  • US Special Operations Command sought exact Everfox hardware, signaling entrenched proprietary lock-in.

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Benefits

Health Insurance

Unlimited Paid Time Off

401(k) Company Match

Growth & Insights and Company News

Headcount

6 month growth

-1%

1 year growth

0%

2 year growth

1%
PR Newswire
Aug 20th, 2026
Kasm Technologies and Everfox partner to deliver secure cross-domain workspace access for government

Kasm Technologies and Everfox have formed a strategic partnership to provide secure cross-domain workspace access for government and defence agencies. The collaboration combines Kasm's containerised desktop platform with Everfox's Trusted Thin Client, enabling users to access applications and desktops across multiple classification levels from a single device. The joint solution eliminates the need for multiple endpoints and virtual desktop infrastructure stacks that typically increase costs and complexity in classified environments. Sessions are policy-enforced and fully wiped upon termination, ensuring no data persists regardless of classification level. The system integrates with existing hypervisors, cloud environments, and identity providers, allowing agencies to modernise infrastructure without completely replacing current systems. The solution is now available to government, defence, and intelligence organisations.

WashingtonExec
Aug 13th, 2026
Maureen Stevens joins Everfox as chief corporate affairs officer.

Maureen Stevens joins Everfox as chief corporate affairs officer. Everfox has appointed Maureen Stevens as chief corporate affairs officer to lead the company's enterprise corporate affairs strategy and oversee communications, government relations, media relations and corporate reputation. In her role, Stevens will also serve as a senior advisor to CEO and chairman Dave Wajsgras and the executive team on external affairs, stakeholder engagement and strategic communications, the company said. "Maureen brings a combination of strategic communications expertise, national security insight, and leadership experience across several highly respected companies," said Wajsgras. "Her ability to shape clear, credible narratives and strengthen corporate reputation will play a critical role as Everfox continues to grow and support our customers' most critical missions." Stevens has over 25 years of senior leadership experience in aerospace, defense and cybersecurity. Before joining Everfox, she most recently served as senior vice president of marketing and communications for SES, where she led global marketing, communications and PR. After SES acquired Intelsat, she led the launch of the new SES brand, and served as senior vice president of marketing and communications at Intelsat before the acquisition. "Everfox has built a remarkable reputation for enabling customers to securely move, share, and use their information in demanding mission environments," said Stevens. "I'm honored to join the company at such an exciting moment and look forward to partnering with Dave, the leadership team, and employees across the organization to deepen our engagement with customers, government stakeholders, and partners while further strengthening Everfox's position as the trusted mission data platform." Stevens has also served in senior communications and PR roles at Raytheon Technologies, where she led cross-enterprise international communications and managed global change communications during the Raytheon-UTC merger. Before that, she led business communications and media relations for Raytheon Intelligence, Information & Services.

Associated Press
Aug 13th, 2026
Everfox appoints Maureen Stevens as chief corporate affairs officer

Everfox, a global defence technology company, has appointed Maureen Stevens as chief corporate affairs officer. Stevens will oversee corporate communications, government relations, and reputation management whilst serving as senior adviser to the CEO and executive team on external affairs and strategic communications. Stevens brings over 25 years of senior leadership experience in aerospace, defence, cybersecurity, and high-tech industries. She most recently served as senior vice president of marketing and communications for SES, where she led the brand launch following its acquisition of Intelsat. Previously, she held senior communications roles at Raytheon Technologies, including directing international communications during the Raytheon-UTC merger. Everfox delivers cybersecurity solutions for mission-critical environments.

Mindlinksoft
Aug 7th, 2026
Breaking down barriers to ultra secure Cross Domain collaboration.

Breaking down barriers to ultra secure Cross Domain collaboration. Admin: Aug 7, 2026, 4:56:00 PM Modern defence and national security operations depend on data moving quickly between people, organisations and systems. Yet the increasingly complex nature of today's mission environment can make secure data sharing and collaboration more difficult. Coalition partners, government agencies and operational teams often work across separate technology environments and different security classifications. These boundaries are essential for protecting sensitive data, but they can also slow its movement and prevent critical information from reaching the right people at the right time. MindLink is working with Everfox to address this challenge, combining secure real-time messaging with high-assurance Cross Domain Solutions. Together, the technologies enable faster and more effective collaboration between classified networks, while maintaining strict security controls around sensitive data. The cross domain data challenge The future mission environment will bring together an increasingly diverse mix of national, international, military and inter-agency participants. Each organisation may operate within a separate network governed by its own security policies, data controls and classification requirements. Without an effective way to connect these environments, personnel can be forced to work across multiple terminals and disconnected systems. This practice, sometimes described as "chair swivelling", increases the burden on users and creates greater potential for delays, mistakes and inconsistent data handling. Legacy import and export processes present another security challenge. Solutions designed primarily for moving individual files may be unable to support the granular, real-time exchange of data needed during fast-moving operations. In other cases, valuable information may not be shared at all because the security risk is considered too high or the technical process is too complex. Defence and national security organisations must therefore strike a difficult balance. Highly classified data must be protected, but authorised personnel must also be able to access and exchange the information they need at operational speed. Bringing MindLink and Everfox together The integration between MindLink and Everfox is designed to support secure, real-time data sharing and collaboration across differently classified networks. MindLink provides an ultra-secure chat messaging platform developed specifically for classified defence and national security environments. Its chat room functionality is combined with secure-by-design information assurance controls, enabling mission-critical communications at classifications up to TOP SECRET. At the centre of the platform is MindLink's data-centric security architecture. Rather than relying solely on the security of a network or device, data-centric security applies controls directly to the information itself. Data attributes, classification labels and user entitlements can therefore determine who is permitted to access or share each piece of information. MindLink's Federated Real-time Need-to-know Information eXchange protocol, or FRNIX, extends these capabilities across traditional mission network boundaries. Developed through the UK Defence and Security Accelerator programme and designed against Five Eyes Signals Intelligence requirements, FRNIX enables sensitive data to be exchanged between separate partner networks through air-gapped hardware components. Everfox provides the secure bridge between those networks. Its Cross Domain Solutions facilitate the automated transfer of data from one security domain to another, supporting scenarios ranging from communications between national and coalition networks to connections involving Secret, TOP SECRET and unclassified environments. Together, the technologies allow authorised users on differently classified networks to participate in shared MindLink chat rooms, while security controls continue to govern the movement and releasability of data across the domain boundary. Building security into the data flow Real-time communications are highly sensitive to bandwidth and latency. Any cross domain security approach must therefore verify data thoroughly without creating delays that undermine its operational value. The joint MindLink and Everfox solution addresses this through a combination of MindLink's data-centric security controls and Everfox's hardware-based verification technology. As information passes through the Everfox Cross Domain Solution, the data is extracted from its original format and represented in a Verifiable Data Structure. It can then be validated at line speed using the Everfox High Speed Verifier before being converted back into a format that the destination MindLink system can understand. This security process creates both a protocol break and a data break. A protocol break helps prevent attacks delivered through the communications protocol, while a data break addresses threats concealed within the information itself. Data filtering, validation and contextual checks provide additional protection before content reaches the destination network. The solution can also apply automated label checking to prevent data from leaving its source network when it is not authorised for release. Messages containing restricted classifications, sensitive codenames or other protected information can be blocked before crossing the security perimeter. Supporting Zero Trust collaboration The integration reflects the principles of Zero Trust security, where access is never assumed simply because a user or system is operating within a particular network. MindLink's data labelling and entitlement-based security controls continually assess whether information can be shared with a particular user or across a specific domain. Its asymmetric federation architecture also supports the "browse down, share up" model, helping defence and national security organisations maintain data sovereignty and control where sensitive information is stored. This enables more precise data protection than a broad allow-or-deny approach. Authorised users can exchange the information needed to support the mission, while security controls remain in place to reduce the risks of data compromise, accidental disclosure and spillage. The result is a unified communications environment that can improve operational agility without weakening the security boundaries protecting classified data and systems. Extending secure data sharing beyond defence The need to exchange sensitive data across organisational and network boundaries extends beyond Five Eyes and NATO defence environments. Central government, policing, intelligence organisations and companies within the defence supply chain may all need to collaborate across separate security domains. Similar data and security challenges also exist in highly regulated commercial sectors, where organisations must combine rapid communication with strict control over sensitive information. By bringing together MindLink's secure messaging and data-centric security capabilities with Everfox's Cross Domain Solutions, the collaboration provides a strong foundation for real-time information sharing across complex defence, government and national security environments. As missions become more distributed and partnership-driven, secure collaboration can no longer stop at the network boundary. Data must reach the right people quickly, but it must do so with its security, classification and handling requirements intact.

Everfox
Aug 5th, 2026
Everfox reaffirms commitment to UK Armed Forces Covenant.

Everfox reaffirms commitment to UK Armed Forces Covenant. Company's Pledge Follows on Heels of Receiving Defence Employer Recognition Scheme Silver Award LONDON, United Kingdom, August 5th, 2026 - Everfox, the global defence technology company delivering trusted information and high-assurance cybersecurity solutions for mission-critical environments, today announced it has renewed its commitment to the UK Armed Forces Covenant during a signing ceremony held at the company's London office. Everfox Chairman and CEO Dave Wajsgras attended the event and personally signed the pledge. "As a company whose mission is to enable warfighters to achieve decision dominance in highly complex operational environments, we are proud to maintain a culture within Everfox that values the contributions and expertise of members of the Armed Forces who help us engineer and deliver these important technological innovations," said Wajsgras. "We are honoured to remain committed to strengthening our support for the Armed Forces community." "Everfox's longstanding support for the UK Defence community reflects a deep appreciation of the values, skills and experiences that members of the Armed Forces community contribute to our nation's security and prosperity. Its commitment to fostering an inclusive and supportive workplace for serving personnel, veterans and military families is both commendable and meaningful," said Air Vice Marshal Ola Fashade. "I am proud to join Everfox as it reaffirms its commitment to the Armed Forces Covenant and the enduring partnership between Defence, industry and those who serve." Everfox previously signed the UK Armed Forces Covenant in June 2023 to publicly affirm its commitment to ensuring that members of the Armed Forces community are treated fairly and are not disadvantaged as a result of their service. In June, Everfox was awarded the Defence Employer Recognition Scheme (ERS) Silver Award, which is given to employers that actively support Defence through measures such as supporting Reservists in balancing military and civilian careers, promoting employment opportunities for veterans, and demonstrating leadership commitment to the Armed Forces Covenant. The Defence ERS, administered by the UK Ministry of Defence, recognises organisations that demonstrate exceptional support for Defence personnel, Reservists, veterans, military families and Cadet Force Adult Volunteers. About Everfox. 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. Everfox enable mission speed and secure collaboration across networks, domains, and allies while ensuring the data powering AI and advanced analytics remains trusted and protected. Everfox don't just defend systems; Everfox deliver decision dominance. Media Contact