Your opportunity
As a Senior Software Engineer in the API Foundations team, you will be working with us to improve our API landscape further, making it even easier for developers to integrate Mollie, and for internal teams to expose their APIs to the rest of the world.
You will work on highly scalable solutions that process hundreds of thousands of API requests daily. Code quality and system scalability are extremely important. Helping us build scalable systems by thinking ahead will be critical to your work.
Our engineering workflow
'Ship early, ship often' is our philosophy.
We like to break up big tasks into smaller ones, deploying gradual product iterations and improvements numerous times every day.
We uphold code quality through thorough and cooperative peer reviews, CI/CD build pipelines and gradual feature roll-outs. In other words, we do everything to make sure you feel comfortable pushing your changes to production on a daily basis.
Our architecture
We come from a monolithic background, with our core systems being written mostly in PHP. As our company started to scale up rapidly, we scaled our infrastructure along with it by employing service-oriented architecture, and queueing systems.
What you'll be doing
Help us to build large-scale systems (such as an API gateway, backend-for-frontend), improve our authentication mechanisms, as well as tools to make integration with Mollie’s API even easier
Work closely with engineers and products to build features at a large scale
Design, build and maintain APIs, services, and systems across Mollie’s engineering teams
Investigate & solve complex problems across the stack
You will put your skills to the test, allow yourself to grow, and learn rapidly
What you'll bring
Minimum of 3 years experience with developing web applications, preferably using PHP / MySQL stacks
Knowledge of modern queueing and caching systems like RabbitMQ or Redis
A knack for reducing system complexity, solving cross-team problems, and striking the right balance between quality and moving fast
Nice to haves
Previous roles within in a fast-paced environment
A good grasp with Google Cloud Platform and/or working as a DevOps engineer
Our selection procedure in a nutshell
Apply by clicking the button. 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 and the role, and get to know you. This can be done at our office, but this could also be via phone, Hangouts, or Skype.
During the interview phase (of max. three rounds), we'll inform you as soon as we've chosen whether we'd like to proceed with you.
Benefits
How we hire
Step 1
Apply
Our Talent Acquisition team and hiring manager will review your application, and respond within 2 weeks.
Step 2
Screening call
If you seem like a Mollie-in-the-making, we’ll invite you to a screening call so we can learn more about each other.
Step 3
Are you the one?
You'll have two or more interviews. And if it's a highly technical role, we'll also assess the specific skills you'll need.
Diversity, Equity & Inclusion

At Mollie we embrace what makes you unique, and nurture a culture that feels like home. We celebrate diversity of people and perspectives every day and are proud to be an equal opportunity employer. We do not discriminate.
Every new Mollie is hired on the basis of qualifications, merit, and business need. We bring open hearts and open minds, we don’t judge each other for our differences, we embrace the unique traits that make our products and culture stronger.
There is an energy at Mollie that can’t be contained. We are proud to be here, and inspired by the problems we have left to solve. So come join the ride.