Product Security Engineer

ABOUT TALON.ONE: Talon.One is the most powerful incentives engine that unifies loyalty, promotions and gamification into one holistic platform. Backed by enterprise-grade security and scalability, Talon.One empowers companies to build personalized, profitable promotions and loyalty programs using any data. Today, over 250 of the world’s most-loved brands including Adidas, Sephora and Carlsberg work with Talon.One to drive deeper engagement and lasting loyalty with their customers. 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: - 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 birthday and moving day - Home office setup budget, a monthly home office allowance - Freedom to work from abroad for up to 90 days worldwide! - Mental health support with nilo.health and a discounted Urban Sports Club membership - 20% company subsidy on your pension contributions - Subsidised BVG public transport ticket and a dog-friendly Berlin office where your furry friend is welcome - Lease your ideal bike through BusinessBike