Senior Implementation Manager

Job description

3 reasons you should join our team as a Senior Implementation Manager:

1. You’ll work at the intersection of fintech innovation and platform scalability, helping shape the future of digital payments.
2. You lead complex technical implementations from kickoff to go-live with full ownership and autonomy.
3. You’ll work in a team that values action, speed, and results - where your work directly contributes to making online transactions easier and safer for millions of users.

OPP is one of the fastest-growing fintechs in Europe, with 100+ people across offices in Delft, Berlin, and London. Our fintech platform powers marketplaces around the globe by arranging payments and enabling them to accept, hold, and disburse funds for their users. That makes our solution more sophisticated and ready to continue growing internationally.

If you’ve ever paid other users on platforms like Marktplaats, eBay-Kleinanzeigen, and IKEA, or booked a holiday home via Nature.house or Micazu - chances are you’ve already met us.

As a Senior Implementation Manager, you lead high-impact integrations from scoping to post-launch success, translating complex client needs into clear technical solutions. You’ll dive into API configurations, act as the voice of our developers, and bridge the gap between business and tech. Working closely with our compact tech and sales teams, you’ll empower clients like eBay, Marktplaats, and ANWB to make our platform their own. Once the solution is defined, you’ll handle the technical delivery: configuring modules, refining documentation, and shaping our API sandbox.

All compared, you will be focussing on:

• Technical configuration of modules and features within our solution.
• Working on our documentation and instructions about our API.
• Contributing to the introduction of an API sandbox.
• Moderating our partner-contact Slack channels.

Job requirements

Your track record shows

• That you have at least 5+ years of experience in the field of software/SaaS/fintech implementations.
• You’ve owned end-to-end integration projects, ideally involving APIs and complex data flows.
• You’re comfortable working with tools like Postman, SQL, HTML, PHP, or similar (and know when to go deep vs delegate).
• You speak both tech and business, translating technical requirements into actionable implementation plans.
• You're fluent in English and German - both verbally and written.

How we invest in you

A company is as strong as the people who help to build it. If you bring the expertise and a client-first mentality, we’ll make sure you receive all that’s needed to excel. We’ll offer you:

• A solid base salary + 13th months
• Hybrid working, 24 paid vacation days, and 2 diversity days.
• Contract for 12 months with the possibility to extend permanently - we’re in this for the long haul!
• Macbook, pension contributions, home office gear, and NS Business card.
• Office lunches plus regular get-togethers over drinks.
• An attractive bike plan: work 24 hours or more and you can join.

"I'm looking for someone who will turn our clients into happy company ambassadors. Ready to hear about your best practices!"

Thomas, hiring manager for this role