Product Security Engineer

Talon.One; Berlin (NH); Hybrid; USD 101,000 - 147,000; Full time

Benefits offered by this job

Learning budget

Language courses

30 days annual leave

Home office budget

Work abroad 90 days

Mental health support

Pension subsidy 20%

Public transport ticket

Bike leasing

Job summary

Talon.One is hiring as part of its early security engineering team in Berlin. You will own security across API authorization, tenant isolation, and AI features, pairing closely with engineers and product managers in a hybrid setup.

You will lead threat modeling, CI‑level security testing, and real-time monitoring while influencing multiple squads with security best practices.

Qualifications

• Shipping production code in security or software roles.
• Knowledge of multi-tenant SaaS authorization and testing.
• End-to-end API security design including auth, credentials, rate limiting.
• Threat modelling using STRIDE; translate threats to tests.
• SAST/DAST in CI/CD with actionable developer feedback.
• Understanding AI feature development, prompts and retrieval.
• Hands-on with Google Cloud, Kubernetes, Wiz, Datadog.
• Ability to influence engineers and operate with minimal playbooks.

Responsibilities

• Threat‑model new product features, including AI components.
• Own tenant isolation and API security across APIs and features.
• Act as design authority for AI features with the team behind UCP/ Predict.
• Build automated cross-tenant testing in CI to verify isolation every build.
• Create automated security checks in CI workflows for developers.
• Coordinate vulnerability response across squads, including auto dep updates.
• Build and own security monitoring and real‑time detections.
• Design API integration security with partners as product assembles.
• Run a security champions program across tribes.

Skills

Threat modelling

API security

Tenant isolation

CI/CD security

SAST/DAST

GCP security

Kubernetes

Wiz

Datadog

OWASP Top 10

Prompt injection

SIEM

AI security

Tools

Google Cloud

Kubernetes

Wiz

Datadog

CI/CD tools

Job description

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

WHY YOU SHOULD WORK FOR US:

• The right attitude: modern methods and a diverse, creative workspace with an open and international culture
• Everyone for the product: Together we create a flexible, highly scalable product with state‑of‑the‑art technologies. We can only succeed if everyone works as a team
• Healthy Growth: Growing our company means growing everyone in the team. We love to share knowledge and learn
• A great environment: Flexible and family‑friendly environment, bright and easily accessible offices, modern software and hardware
• High flexibility degree: Prefer to work early or late at night? Do you have to pick up your children from kindergarten? Do you prefer working abroad? We believe in results and motivated employees

Talon.One is an Equal Employment Opportunity employer that proudly pursues and hires a diverse workforce. We do not make employment decisions on the basis of race, color, religious belief, ethnic origin, nationality, sex, gender identity, sexual orientation, disability, age, military or veteran status, or any other basis protected by applicable local, state, or federal laws or prohibited by company policy. As an employer we strive for a healthy and safe workplace and strictly prohibit harassment of any kind.

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