Product Security Engineer

You’ll be one of Talon.

One’s first two security engineering hires, owning the security of everything we ship to our customers and third-party partners, from API authorization to the AI features going into our platform and their real-time observability and detections. You’ll work hands‑on, pairing directly with engineers and product managers rather than filing tickets, across a multi‑tenant platform that powers promotions and loyalty for some of Europe’s largest retail and travel brands.

Based in Berlin, hybrid.

• Threat‑model new product features before they’re built, including AI‑embedded ones, and turn what you find into real engineering work
• Own tenant isolation and API security across our Rule Engine, Integration API, Management API, CAMA, UCP Predict features, Talon.
  
  One MCP and third‑party integrations
• Act as the security design authority for our AI features, working closely with the team behind UCP and Predict
• Build automated cross‑tenant and adversarial testing that runs in CI, so isolation gets checked on every build, not only during our external yearly Pentest iterations
• Build standard, frictionless and automated golden paths for code security checks in CI workflows that developers can adopt by default without slowing down delivery
• Run vulnerability and coordinate efficient patch response across every squad outside Platform, from automated dependency updates to drilled emergency response
• Build and own application and AI security monitoring with our observability tools and build real‑time security detection rules and alerts, and security events runbooks
• Design the security of the API integration between Talon.
  
  One and Adyen as our products come together
• Run a security champions programme so all our tribes build real security capability, not just the security team
• Experiment with AI, leverage innovative ways and build new workflows to identify, prioritize, and remediate product security risks at scale.

• Experience with shipping production code, whether you come from software engineering or from security work that includes coding
• Experience with a multi‑tenant SaaS platform’s authorization and tenant isolation model, and strong knowledge of how to test for broken object‑level authorization automatically
• Design API security end‑to‑end: authentication, credential lifecycle, rate limiting, abuse resistance and webhook security
• Hands‑on experience with threat‑modelling methodologies such as STRIDE, translating identified threats into actionable engineering requirements and security tests
• Practical experience implementing and tuning SAST and DAST tools in CI/CD workflows, with a focus on useful developer feedback and effective vulnerability remediation
• Understanding how AI features actually get built, retrieval, context assembly, tool calling, agent loops, and know where indirect prompt injection breaks multi‑tenant isolation
• Hands‑on experience with Google Cloud security, Kubernetes, and tools like Wiz and Datadog
• Know how to build security monitoring and detections in‑house tools (SIEM) yourself, from designing the signal through tuning it and writing the runbook
• Strong knowledge of OWASP security guidance, including the OWASP Top 10, API Security Top 10, and Top 10 for Large Language Model Applications
• Ability to influence engineers who don’t report to you, and feel comfortable being early in a function with no existing playbook

• 90+ team of engineers, product managers and product designers in Berlin
• Leaders with 8+ years of experience building our promotions engine
• €1,000 annual learning budget and free German language courses to boost your skills
• 30 days of annual leave, plus extra paid days for your…