Application Engineer II

Since 2004, we've had one clear goal: to make payments and money management effortless for every business in Europe.
Today, more than 250,000 companies use Mollie to get paid, manage money and grow – with products designed to be simple, scalable, and dependable.
With 950+ Mollies across 14+ locations, we care deeply about autonomy and craft. So we work in small teams, with real ownership, and we trust you to make the right decisions.
We're building for the long term, so we provide the tools you need, processes you can rely on, and a balanced work environment to help you do work you're proud of.
Sound like your kind of place? Let's build together.

As an Application Engineer II in the Discover & Create team, you'll work where Platform and Application Engineering meet. Your customers are Mollie's own engineers. You'll build and evolve internal developer tooling, the Mollie Developer Portal (MDP), software catalogs and self‑service workflows, so product engineers can ship quickly and safely. Every automation, portal feature or CLI you build speeds up hundreds of developers.

Your day to day mixes exploration and delivery. You'll run exploratory R&D, set golden paths and engineering standards, and write Architectural Decision Records (ADRs). You'll build automations, mainly in Golang alongside Type Script and React, that hide the complexity of CI/CD, Kubernetes and Terraform. You'll also help design and deliver developer tooling for AI, such as evaluation harnesses, Greptile integration and AI marketplace capabilities.

You'll have real freedom here. Plans are shaped by what developers need, so you'll prototype libraries and tools, validate them and graduate them across the organisation. Fast, friction‑free tools and dependable golden paths let product squads build and release secure payment products quickly. That moves us toward our mission of being the most loved financial services provider in Europe.

• Features on the Type Script and React frontend of the Mollie Developer Portal, starting in your first three months.
• Your first Golang automations early on, while you shadow cross‑team discovery sessions.
• Production ready developer automations in Go that interface with platform systems.
• ADRs for emerging developer tools.
• Golden paths, built together with platform teams across Risk, Security and EDA.
• Developer‑facing AI tooling, including Greptile, AI evaluation harnesses and AI marketplace features, driving next year's roadmap initiatives.
• New libraries and tooling you incubate, then hand over smoothly to the designated platform teams once they mature.

• Demonstrated experience building backend automations or services in Golang, with solid proficiency in the language.
• Practical web development skills in Type Script and React, so you can build and maintain interfaces in the Mollie Developer Portal.
• A strong automation mindset, with a drive to abstract platform complexity and remove repetitive friction for engineers.
• Foundational working knowledge of CI/CD pipelines, Kubernetes, Docker and Terraform. The work is infrastructure‑adjacent: you create abstractions rather than manage cloud infrastructure.
• A high level understanding of systems design and experience authoring ADRs.
• Comfort with ambiguity and flexible roadmaps, and the ability to work with diverse cross‑functional stakeholders.

At Mollie, growth is personal. We believe everyone should have the chance to develop their skills, explore new challenges and shape their career on their own terms.

You’ll get regular feedback and performance reviews to support your development, with fair and transparent salary reviews along the way. Many Mollies move into new roles or take on new projects to stretch…