Senior Application Security Engineer / Pentester - Hosting

Looking for a role with plenty of growth opportunities?

Join a fast-growing AI cloud provider developing innovative platforms powered by cutting-edge research to transform the future of digital commerce and automation. Trusted by organisations across international markets, the company combines advanced AI capabilities with a strong commitment to data protection, digital sovereignty, and scalable innovation.

The organisation is seeking for a skilled Senior Application Security Engineer to identify and exploit real world vulnerabilities across applications, APIs and cloud infrastructure before attackers do, helping secure a platform built on proprietary infrastructure rather than public cloud. If you would like to learn more about this opportunity, feel free to reach out and apply today!

Responsibilities:

• Perform hands on penetration testing across web applications, APIs, cloud platforms and publicly exposed infrastructure.
• Conduct offensive security assessments, simulate real world attacks and identify vulnerabilities across the AI cloud platform.
• Work closely with engineering teams to validate findings, recommend remediations and improve secure development practices.
• Assess the security of cloud infrastructure, internal tooling and production environments using a red team mindset.
• Develop and refine offensive security tooling, testing methodologies and security processes as the platform continues to scale.
• Support incident investigations, security reviews and continuous improvements across application and infrastructure security.

Skills/Must have:

• Proven experience within offensive security, penetration testing or red teaming.
• Strong hands on experience testing web applications, APIs and modern application architectures.
• Experience assessing cloud infrastructure, ideally within a cloud service provider or infrastructure platform.
• Strong understanding of infrastructure security across Linux, networking and self managed environments rather than purely public cloud services.
• Experience identifying, exploiting and communicating security vulnerabilities with clear remediation guidance.
• Excellent communication skills with the ability to work closely with engineering teams and explain technical findings clearly.

Nice to have:

• Experience securing AI platforms, GPU infrastructure or large scale cloud environments.
• Knowledge of container security, Kubernetes or infrastructure as code.
• Experience developing offensive security tooling or automation using Python or Go.
• OSCP, OSWE, CRTO, CREST or similar offensive security certifications.

Benefits:

• Competitive salary with equity and comprehensive benefits package.
• Opportunity to secure one of Europe's fastest growing AI cloud platforms.
• Work on cutting edge infrastructure built specifically for AI workloads.
• No take home tests with a practical, technical interview process.
• Hybrid working from Shoreditch or remote across Europe for exceptional candidates.

Salary:

• Up to £110,000 gross per year
• Shares Scheme