UI Engineer

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UI Engineer

Mollie is one of Europe's fastest-growing fintech companies. We are looking for UI Engineers who want to make an impact by working on next-generation financial APIs.

Full-time · Lisbon

Hi, we are Mollie! 👋🏼

Our mission is creating a greater playing field for everyone. By offering convenient, safe and worldwide payment solutions we remove barriers for companies of all sizes to compete on equal terms.

Your opportunity: 

Mollie is one of the fastest-growing companies in Europe, and we are facing many interesting challenges from both a technical, as well as organizational perspective. You will play a key role in the development of new features, and maintenance of existing features and you’ll have the opportunity to shape the rest of your career at Mollie.

As a UI Engineer at Mollie, you’ll be responsible for bringing a next-level user experience to all of our front-facing products. You will work within a multidisciplinary team of designers, full-stack engineers, as well as backend engineers to constantly improve the look and feel of our products.

What you'll be doing:

With multiple payments being performed on our platform every second of the day, code quality and system scalability are becoming increasingly important. Helping us build scalable products by thinking ahead will be an important part of your work.

Next to our existing APIs and dashboard, we are working on innovative financial solutions for our merchants. We are happy to share the details over a coffee, but it's safe to say we will put your skills to the test allowing you to grow and learn rapidly.

Our architecture

Mollie’s frontend landscape consists of multiple apps, and each application has its own setup, which is optimized for the app’s purpose. Think of our merchant dashboard, API documentation, mobile apps, etc.

In general, our apps are written using TypeScript, in React. Our backend systems are generally written in PHP/Node, and we’re currently busy splitting up our monolithic application into multiple services, and migrating them to the Google Cloud.

We care about performance, stability, and resilience. Over the last couple of years, we’ve constantly been working on making our applications ready to handle the next phase of our growth.

We work with flexible and reusable components, have an extensive UI library that we maintain internally, and are always looking for parts of the codebase that we can open-source and share with the community.

Meet the team!


Senior Product Manager


Engineering Manager 


Full Stack Engineer


Software Engineer

What you have:

  • A minimum of 3 years of experience in developing complex front-end web applications.

  • Experience with modern JavaScript frameworks and libraries such as React, Vue, and Angular.

  • Experience with styling web applications, using tools like CSS (CSS modules) or CSS-in-JS (Styled Components).

  • The drive to make our product available to everyone by applying accessibility web standards.

  • A knack for creating intuitive user experiences.

  • You know how to pinpoint performance issues, and bring suggestions to the team on how to improve the performance of our frontend apps.

  • Experience with test-driven development.

  • Ability to work closely together with our other UX and UI designers. You are a strong communicator and know when to be pragmatic, and when to focus on the little details.

Nice to haves:

  • Experience with TypeScript is an advantage.

  • Experience with design systems and/or internally developed component libraries.

  • Experience with (Node) back-end development.

  • Experience with React Native

  • Knowledge of language primitives. You should feel comfortable interacting with native APIs built into the browser.

Our selection procedure in a nutshell:

  • Apply by clicking the button below. The more you share about yourself and the reason you apply at Mollie, the better!
  • Let's first have a 'coffee chat' to introduce Mollie, the role and get to know you. This can be at our office, but this could also be via phone, Hangouts or Skype.
  • During the interview phase, we'll inform you as soon as we've decided whether we'd like to proceed with you.
  • The interview phase may include a technical assignment to test your technical merits.

Because of the current circumstances, we will interview you as well as hire you completely remotely. However, as soon as possible, you will continue your work at our office in the heart of Lisbon.

Being authentic is our baseline

Mollie is one of Europe’s fastest-growing fintech companies. We provide a simple and clear payment API, which enables webshop and app builders to implement more than ten different payment methods in one go.

In the first few years of existence, Mollie was a developer-only adventure, and about 15 years later devs and techs still comprise roughly 45% of all staff. As a natural consequence, Mollie still is—and aims to be—highly tech-minded.

This focus on the technical side can be found in various things. Like, you pick whatever tools you want to use to get the job done. MacBooks, absurdly large or many screens, top-notch noise-cancelling headphones and whatever other equipment makes your nerd-boat float. We go to great lengths to create a space that allows you to focus on the things that will make you happy: shipping great features you helped dream up and build.

We don’t have code monkeys, but we do give you a problem and trust that you will create an outstanding solution. We believe in sane working hours and long-term solutions, instead of 70-hour work weeks with temporary workarounds.

What you get