Staff Security & Platform Engineer

As Staff Security & Platform Engineer within the Corporate IT team, you'll sit at the intersection of IT, network security, and internal platform infrastructure. You'll be an integral part of the team that enables Taxfix's growing agent ecosystem to be secure, compliant, and accessible to all employees. This is a builder role: you'll design the frameworks, harden the platforms, and create the conditions that enable people at Taxfix to build responsibly.

What you'll do

• Develop tools, capabilities, and agentic skills that ensure compliance with EU AI Act in GDPR, as well as security standards, enabling people across the organization to ship, integrate and deploy high quality automations and internal tools.
• Co-design and govern the permissioning framework that defines what agents are allowed to know and access, ensuring no agent retains broader permissions than its job requires.
• Own MDM, endpoint security, and identity and access management across internal systems, and lead incident response for security events involving agents or internal infrastructure.
• Work alongside the Systems Engineer to build, harden, and evolve the agentic platform layer — including secure sandboxes, credential vaults, and CI/CD pipelines with embedded security checks.
• Design and run adversarial testing exercises against agent deployments — covering prompt injection, privilege escalation, and data exfiltration via reasoning chains.
• Brief leadership on emerging AI threat vectors and translate them into practical, actionable mitigations.

What you'll need

• Solid background in security engineering, with hands-on experience in penetration testing, threat modelling, or red teaming.
• Familiarity with AI and machine learning-specific attack surfaces, including prompt injection, data poisoning, model inversion, and indirect injection via documents or APIs.
• Practical experience designing and enforcing least-privilege architectures and identity and access management in real-world environments.
• Understanding of GDPR and DSGVO in practice — you've built or audited data classification and retention frameworks.
• Comfort at the platform layer: CI/CD pipelines, secrets management, sandbox environments, and scripting and automation.
• Network security fundamentals and ability to communicate clearly and document rigorously.

What they offer

• Free mental health coaching sessions.
• Monthly allowance for flexible services and benefits.
• Employee stock options for all employees.
• 30 annual vacation days and flexible working hours.
• Generous learning budget and internal L&D guidance.
• Work from abroad for up to six weeks annually.