Security & Infrastructure Engineer (Defence AI scaleup)

Were looking for a reliable experienced Security & Infrastructure Engineer (37 years in IT cloud and security) to join our growing defence AI company in central Oxford helping our teams stay productive cyber-compliant and protected as we scale. We develop and deliver mission-critical uncrewed aircraft subsystems so reliability problem solving skill and adaptability really matter.

This role sits at the intersection of IT operations cloud infrastructure and cyber security.
You will work closely with a fractional Security Lead deputy CTO COO IT manager plus other external CISO and consultants as relevant. You will be supporting delivery of a structured security programme while ensuring day-to-day systems remain secure reliable and efficient.

This is a hands-on role suited to someone who enjoys both solving operational IT issues and implementing modern security controls in a fast-paced high-assurance advanced environment. You will play a key role in transitioning the company toward a security-first infrastructure model.

How you will make an impact

• Security & Infrastructure: Implement and maintain secure scalable IT and cloud infrastructure; Support rollout of Microsoft security ecosystem (Defender Intune Entra Purview etc.); Configure and maintain identity access control and endpoint security; Improve logging monitoring and alerting capabilities.

• Security Programme Delivery: Support implementation of Cyber Essentials Plus ISO27001-aligned controls Defence security requirements (e.g. DEFSTAN-aligned environments); help maintain diverse assets globally (Linux Windows Mac) security control policies and procedures continuous security improvements.

• IT operations: Administer and support Microsoft 365 Google Workspace cloud infrastructure (AWS/Azure) internal tools (Slack Docker etc.) providing incident response troubleshooting and technical service delivery.

• Engineering & DevOps Support: Work with engineering teams to deliver secure development environments AI / embedded device security secure lab and flight trials environments

To succeed in this role you must have:

• 37 years hands-on experience in IT cloud infrastructure and security with potential to grow into security leadership

• Experience administering cloud environments (AWS potentially Azure /hybrid/ local/ others)

• Experience with Microsoft 365 Google Workspace Docker Slack VMs AI LLM tools

• Experience with security frameworks such as ISO27001 NIST

• Experience managing Linux Windows MacOS environments using endpoint management tools such as Intune

• Experience with networking tools such as Cloudflare Unifi or Cisco

• Experience with Defender XDR Microsoft Purview Sentinel or similar cyber data security tools

• Competency in incident response investigation vulnerability remediation

• Ability to obtain and maintain UK Security Check clearance

• Willingness to work on-site 4 days per week

• Alignment with our ways of working: clear & concise communication; structured thinking to bring clarity from incomplete or imperfect information; high organisation capacity and ownership to juggle multiple priorities; commercial awareness to apply judgment not just follow procedures; growth mindset and positive energy.

It is a plus if you also have:

• Experience in designing IT systems from the ground up

• Relevant security qualifications or certifications eg CISSP

• Competency in DevOps embedded systems security

• Experience in aerospace defence or regulated environments

• Familiarity with DEFSTAN-style assurance requirements

• Experience in tech startups working with engineering teams requirements engineering devices (IoT AI cameras embedded devices) and environments

• Military Background

By joining us youll have:

• The ability to make a measurable difference in the creation of cutting-edge technology in a rapidly growing start-up

• Fast-paced environment with a world-class positive talented and high-achieving team

• Forward-thinking supportive culture with company retreats and strategic alignment

• World-class growth opportunities and training resourcesincluding self-development daysAn opportunity for drone pilot training

• Merit-based compensation

• 5% employer pension contribution

• 25 days holiday UK bank holidays

• Medical Insurance

• Relocation Support package

• Team socials

• A variety of perks that are evolving: Free Monday team lunch Cycle2work scheme annual subscription allowance

Security clearance:

Due to the sensitive nature of some of our work it would be beneficial for candidates to be able and willing to obtain and maintain the necessary security clearance for this role.

Location

This is an office-based role in Oxford. Youll work alongside leading engineers AI specialists and industry pioneers contributing directly to cutting-edge advancements in autonomous technology.

The Archangel Experience

We are makers and engineers first driven by the desire to solve challenges that matter. Automation is how humanity moves forward and for us its more than a method; it is a mindset- central to how we streamline work and deliver cutting edge solutions that make a real difference.

Our culture is grounded in high integrity teamwork and a shared pursuit of excellence. Learning never stops here. We prioritise growth knowledge sharing and collaboration so every team member is empowered to thrive. We are looking for people who are proactive collaborative and passionate about purpose led technology. If you are excited by meaningful challenges thrive in fast paced environments and want to build technology that supports solving real-world problems you will feel right at home.

So whats next

Apply now and a member of our HR team will get in touch with you shortly. Our usual process includes reviewing your CV a 30-minute phone screening a live technical assessment and interview plus if your interview falls on a Monday you might even get to enjoy lunch with the team!