Senior Application Engineer

Mollie; Amsterdam; On-site; EUR 120,000 - 150,000; Full time

Benefits offered by this job

26 holiday days

Birthday off

Health insurance

WFH equipment budget

Discounted lunch

NS Business Card & bike lease

Remote work 20 days/year

Job summary

Mollie is hiring a Senior Engineer in Amsterdam to build scalable financial products for Europe. You’ll lead architectural decisions, mentor juniors, and drive end‑to‑end engineering initiatives across payment and money management platforms.

Expect collaboration with cross‑functional teams to achieve high performance and reliability. You will contribute to Mollie Capital and in‑person payment products, shaping a seamless, all‑in‑one platform for merchants while maintaining strong focus on

Qualifications

• 6+ years of experience in developing large‑scale applications, preferably with PHP or Java.
• Experience leading architectural decisions and technical initiatives.
• Mentoring junior developers and driving team growth and skill development.
• Excellent communication with stakeholders and a product‑first mindset.

Responsibilities

• Build large‑scale systems capable of handling high transaction volumes.
• Develop products customers love by iterating from idea to solution and measuring performance.
• Provide mentorship and guidance to junior engineers.
• Lead technical initiatives from architecture design to implementation.
• Own code quality, engineering excellence, and best practices across systems.
• Document knowledge to enable efficient domain understanding and processes.

Skills

Large‑scale systems

PHP/Java

Go/Python/C#

Mentorship

Architectural decisions

Communication

Tools

PHP

Java

Go

Python

Job description

At Mollie, we’re on a mission to make payments and money management effortless for every business in Europe. Serving more than 250,000 businesses across the continent, we aim to cut through financial bureaucracy that hinders great ideas from growing. Our belief is that accepting payments, driving revenue, accessing capital, and managing money should be seamless for our merchants.

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.

Enjoy the flexibility to work from abroad for 20 days a year (excl high risk countries)

Lifestyle and Health Support

• Reach out for coaching and support whenever you need it via OpenUp.
• 26 holiday days
• Time to relax. Plus an extra 2 days off in between 27 and 31 December!
• Enjoy €60 per month net towards taking care of yourself.

Commute options

• Receive an NS Business Card and participate in our bike lease plan

Birthday off

• It’s your special day! Why spend it at the office?

WFH Equipment Budget

• One off budget of €400 for our new hires.
• With WFH & Internet allowance at €60 a month.

Discounted Lunch

• Hot and cold meals plus snacks available each day for less than €4 and only pay when you use the service!

Health Insurance

• Insure with ONVZ or receive €125 net towards your own insurance.

All Mollies get together, connect and have fun.

How we hire

Step 1

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.