Application Engineer I

Businesses deserve better from finance. Less friction, more freedom. Since 2004, Mollie has been on a mission to make payments and money management effortless for every business in Europe.

Today, more than 300,000 companies trust our all-in-one platform to get paid, manage money and grow on their terms. Simple, scalable and built with real businesses in mind.

We're one of Europe's fastest-growing fintechs, with 900+ Mollies across 12+ locations. Our people make this growth possible. We move fast, build with purpose and care deeply about our customers. Whether you're solving problems, building market-leading products or exploring how AI can make work smarter, you'll have the freedom to create and the trust to deliver.

If you're ready to grow, shape the future of fintech and join an ambitious, high-performing team, this is the place for you.

Your impact

This role is deeply embedded in the product. You'll tackle real complexity, not just build features. Mollie's product involves intricate financial operations like splitting money and payment routing, offering genuinely interesting challenges that demand thoughtful engineering solutions. This is a chance to shape products and solve problems that accelerate business growth across Europe.

You’ll contribute to maturing an "underbaked" product area, giving you significant flexibility and freedom in development. Working with a dedicated senior engineer as a mentor, you’ll grow directly alongside the product and the team. Your contributions will directly unlock new revenue streams for Mollie and help thousands of businesses manage their finances effortlessly.

What you'll ship

Own smaller problems and deliver defined pieces of work end-to-end — from shaping to building, testing, and measuring feature performance.

Design, build, and maintain APIs, services, and systems, ensuring consistency and avoiding breaking changes.

Write high-quality, testable, readable, and maintainable code in at least one object-oriented language like PHP, Java, or TypeScript.

Contribute to solution conversations, helping identify tasks and collaborating with the team and stakeholders to overcome obstacles.

What you’ll bring

3+ years of software engineering experience.

Proven ability to commit quality code in at least one object-oriented programming language (e.g., Java, PHP, or similar).

Experience working with large-scale applications.

Demonstrated experience in designing systems and handling concepts like queuing, caching, concurrency, fault tolerance, and scalability.

A product‑mindset approach, allowing you to ask the right questions and contribute to solution conversations that impact wider business goals.

Strong English communication skills to effectively collaborate with the team and stakeholders.

Grow your way

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 themselves, and we actively hire from within to help you take the next step.

No matter if you're aiming for promotion, exploring a different career path or building new skills, you’ll be supported with the tools, trust and opportunities to grow your way.

Unlock your full potential and join us to eliminate financial bureaucracy

If you're excited by the idea of building what's next, for yourself and for thousands of businesses across Europe, we'd love to hear from you.

AI at Mollie

We believe in Always Be Shipping, and AI brings that philosophy to life across every team, every role, every day.

AI is core to how we build. It helps us move faster, simplify work and make smarter decisions, creating real impact for the businesses we serve. We're looking for people who are excited to use AI to shape the future of finance with us.

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