Full Stack Engineer II

About the Position

Full Stack Engineer II

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About the Company

Build with us

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.

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Responsibilities

As a Full-Stack Engineer II on the Partner Experience team, you will:

• Take end-to-end ownership of product development, from shaping the idea through to building, testing and measuring performance in production.
• Design, build and maintain APIs, services and embedded components across frontend, backend and full-stack, with a focus on the self-serve integration experience including Connect activation, regular payment API exposure and multi-sub-merchant support.
• Build and contribute to large-scale systems capable of handling high volumes of transactions efficiently, thinking in system design terms rather than adjusting existing patterns.
• Weigh product trade-offs and make decisions about what to build and how to expose it to partners, working closely with the Product Manager to shape the self-serve track.
• Work across multiple interacting systems simultaneously, managing context and keeping focus on what matters most for partners and their merchants.
• Challenge ideas and bring your own. This team expects engineers to have opinions and act on them.

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Requirements

• 5+ years of professional software engineering experience, with genuine full-stack range. You are comfortable owning a feature end-to-end across both frontend and backend, not just shipping UI with light backend glue.
• Strong frontend engineering skills including React, React Native and TypeScript, combined with real backend capability and the ability to design and reason about more complex backend systems.
• A product mindset. You ask questions, bring curiosity, and are comfortable making decisions in a complex product space rather than waiting for a fully defined spec.
• Experience building embedded components for platform or infrastructure use cases, whether frontend, backend or full-stack.
• Comfort working across multiple interacting systems in a fast-paced, broad-scope environment where the work is sometimes vague and the context shifts frequently.
• The ability to weigh options and trade-offs to solve a problem, not just execute on what is in front of you.

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We Offer

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.

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About the Company

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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Location: Milan, Lombardy, Italy

Employment Type: Full time

Location Type: Hybrid

Department: Engineering