Product Security Engineer

Talon.One, an Adyen company, is the most powerful incentives engine that unifies loyalty, personalized promotions and offer management into a single platform.

Built for enterprise scale and security, Talon.One helps businesses design and deliver incentives that drive real customer behavior.

Today, over 300 of the world’s most-loved brands including Sephora, Gymshark and Costa Coffee work with Talon.One to turn their incentives into a reliable growth engine.

ABOUT THE ROLE:

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.

ONCE YOU ARE HERE YOU WILL:

• 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.

WHAT WE NEED YOU TO BRING TO THE TABLE:

• 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

WHAT'S IN IT FOR YOU:

• A product & engineering team, now part of Adyen, building the incentives engine behind some of the world’s biggest brands

• Adyen+, a significant monthly allowance to spend on whatever matters most to you and your wellbeing

• 28 days of paid annual leave

• €115 monthly commuting allowance when you join us in the office 3 days per week

• 25% employer contribution to your pension

• Annual all-company gathering at Adyen’s headquarters in Amsterdam, plus regional team events throughout the year

• Opportunity to connect in person at Adyen offices across 29 locations worldwide