Senior Application Engineer

Mollie; Amsterdam; Hybrid; EUR 90,000 - 120,000; Full time

Job summary

Mollie is seeking a Senior Engineer to lead the design and development of scalable financial products in Europe. You’ll shape architecture, drive end-to-end solutions, and mentor junior developers while collaborating with stakeholders.

The role emphasizes ownership, technical excellence, and delivering value in a fast-growing payment platform. You’ll contribute to Mollie Capital and in-person payments initiatives, expanding product offerings while maintaining high code quality and strong product

Qualifications

• 6+ years of experience in developing large-scale applications, preferably with PHP or Java.
• Proven experience in leading architectural decisions and technical initiatives.
• Experience in mentoring junior developers and driving team growth.
• Excellent communication skills with stakeholders.
• Creative problem-solving and product-focused thinking.
• Accountability and proactive improvement mindset.

Responsibilities

• Building Large-Scale Systems: Designing and engineering systems that can scale to handle high volumes of transactions.

Skills

Large-scale systems design

PHP/Java

Go/C#/Python exposure

Mentoring

Communication

Job description

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 a Senior Engineer, you'll be at the forefront of developing financial products that will shape the future of how businesses manage their finances. Along with expanding into new markets and handling an increasing volume of transactions, Mollie has recently introduced exciting new products to broaden our offering. You’ll have the opportunity to bring your ideas to life and contribute to these impactful projects. Mollie Capital offers easy access to flexible financing, providing funding to support growth and cash flow management. In-person payments , allows merchants to accept payments at their physical stores through our terminal and mobile app. These innovations are just the beginning, enabling Mollie to offer a seamless, all-in-one payment solution and money management platform.

What You will Be Doing:

Building Large-Scale Systems: Designing and engineering systems that can scale to handle high volumes of transactions.

Developing Products Our Customers Love: Iterating from an idea to the final solution, shaping, building, testing, and measuring the performance of the features our customers love.

Mentorship: Providing guidance and support to junior team members, fostering their growth through mentoring, knowledge-sharing, and hands-on collaboration.

Tech Leadership: Leading technical initiatives from architecture design to implementation, ensuring engineering excellence.

Problem-Solving: Utilising your creative problem-solving skills and analytical abilities to resolve complex issues and contribute to our mission of making financial processes effortless.

Documentation and Knowledge Sharing: Creating comprehensive documentation to facilitate domain knowledge sharing and set up optimised processes.

Engineering Excellence: Owning the code quality and engineering excellence and best practices of our systems.

What You’ll Bring:

Always Be Shipping Mindset: It’s about consistently delivering value to customers, where speed and quality go hand in hand.

6+ years of experience in developing large-scale applications, preferably with PHP or Java. Experience with Go, C#, or Python is also valued but you are willing to work with PHP or Java.

Proven experience in leading architectural decisions and technical initiatives, delivering end-to-end solutions, and optimising processes.

Experience in mentoring junior developers and implementing strategies to drive team growth and skill development.

Excellent communication skills, with experience working effectively with various stakeholders. Can explain complex problems and solutions in simple terms.

Creative problem-solving skills and the ability to shape ideas with a product-first approach, as well as analyse and resolve complex issues.

Ability to hold yourself accountable for your tasks, and show a willingness to proactively identify and improve things, whether technical or business related.

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.