Engineer II – IAM Modernization

Your opportunity

At Mollie, we’re on a mission to make payments and money management effortless for every business in Europe. Serving more than 250,000 businesses across the continent, we aim to cut through financial bureaucracy that hinders great ideas from growing. Our belief is that accepting payments, driving revenue, accessing capital, and managing money should be seamless for our merchants.

Our Identity & Access Management (IAM) Modernization team is at the heart of this mission. This team is responsible for transforming Mollie’s customer-facing authentication infrastructure from a home-grown system to a scalable, modern solution that supports our next phase of growth.

About the Lisbon hub

Situated in the heart of Lisbon at Marquês de Pombal, our engineering hub has grown to 60+ engineers across multiple domains. We’re proud of our diverse, English-speaking culture that thrives on collaboration, continuous improvement, and impact. Our teams are shaping the future of payments and financial services through robust backend systems, seamless user experiences, and innovative financial products.

What you’ll be doing

• Contribute to the migration of Mollie’s customer-facing IAM infrastructure from home-grown systems to modern third-party solutions such as Auth0 or ORY.

• Design, implement, and maintain secure authentication and authorization flows that serve hundreds of thousands of users.

• Collaborate with platform, product, and security teams to ensure IAM solutions are seamlessly integrated across Mollie’s ecosystem.

• Ensure high availability and reliability of IAM services, applying infrastructure-as-code best practices using Docker, Kubernetes, and Terraform.

• Participate in code reviews, technical discussions, and architecture decisions within the team.

• Contribute to documentation and internal knowledge sharing to help the broader engineering organization work with our new IAM platform effectively.

What you’ll bring

• Always Be Shipping Mindset: It’s about consistently delivering value to customers, where speed and quality go hand in hand.

• 5+ years of experience working in software engineering, primarily in PHP or Java.

• Experience with authentication platforms (e.g., Auth0, ORY, Keycloak) is a strong nice-to-have, especially in the context of migrating from custom-built solutions.

• Familiarity with Docker, Kubernetes, and Terraform is a big plus.

• A solid understanding of software design principles, secure coding practices, and modern development workflows.

• Strong collaboration and communication skills, with the ability to work cross-functionally in a fast-paced environment.

• A mindset of ownership, pragmatism, and continuous improvement.

Why Mollie?

• Join one of Europe’s fastest-growing fintechs and help redefine how businesses manage payments and identity.

• Work from our Lisbon hub with a passionate team of 60+ engineers who love what they do.

• Collaborate across teams and make a direct impact on the security and scalability of core infrastructure.

Please note: For this role, we do not offer relocation support for candidates outside of Europe.