At Catawiki, every day brings the extraordinary! Whether it’s Daniel Ricciardo’s Formula 1 Car , a Woolly Mammoth’s Skeleton , Lady Gaga's Jumpsuit or Usain Bolt’s running shoe , we encounter exceptional objects every day. We’re a one-of-a-kind marketplace for buying and selling special objects.

Each week, more than 100,000 unique items are auctioned, all carefully curated by our passionate in-house experts. Having sold over 25 million unique objects, our mission is to become the world’s most popular destination for special objects. As a growing, diverse and sustainable scale-up, we proudly live by three core values.

If these values resonate with you, we’d love to explore how you can join us. Taking ownership and driving impact Being open to change and feedback Being passionate about our mission and our customers.

About The Role

and Team As a Security Engineer, you’ll join our Security function and work closely with Platform Engineers, development teams, Legal, IT, Trust Safety teams to ensure the protection of our platform, our users, and their data. You’ll help build and maintain a strong security foundation across our systems — including our emerging use of AI — making security a natural part of how we design, build, and operate at scale. In this role, you’ll operate in a highly collaborative, engineering-driven environment where security is a shared responsibility.

You’ll combine hands-on technical work with cross-functional partnership, enabling secure product development, guiding teams through best practices, and helping Catawiki maintain user trust while continuing to grow securely and responsibly in an AI-enhanced environment.

What You’Ll Do

Identify, assess, and remediate security vulnerabilities across applications, infrastructure, internal services, and AI/ML pipelines. Conduct secure code reviews, threat modeling, and security assessments for new features, architectural changes and legacy components. Implement and maintain secure storage mechanisms, encryption practices, secrets management, and key management solutions.

Define, document, and enforce security policies, standards, and best practices throughout the software development lifecycle (SDLC), including AI-related data handling and model governance. Collaborate closely with Platform Engineers to integrate security into CI/CD pipelines, infrastructure-as-code, runtime environments.

Requirements

Participate in incident response — investigate security events, triage issues, support remediation, and strengthen preventive controls. Raise security awareness across the company by providing guidance, training, and proactive support for secure development, AI safety, and system design. Contribute to long-term security strategy by evaluating emerging threats — including those involving AI — identifying opportunities for automation, and recommending new tools or processes.

Who You Are

You have development experience in Ruby, Python, or a similar language , and you’re comfortable reviewing and contributing to backend codebases. You bring 3+ years of hands-on security engineering experience , ideally in a cloud-based or high-traffic environment. You understand application, infrastructure, and AI/ML security principles, and you can navigate risk within data pipelines and model-driven systems.

You have strong knowledge of secure coding practices and common vulnerabilities (OWASP, SANS) across both traditional and AI-enabled services. You’re experienced with secure code reviews, threat modeling, and designing practical and scalable mitigations. You have a solid understanding of cryptography, encryption, key management, secrets handling, and secure data storage.

You’re familiar with integrating security into modern SDLC practices — including pipelines, IaC, cloud-native environments, and emerging AI workflows.