Senior Backend Developer (PHP)

3 reasons you should join our backend team: 1. Engineer for reliability and scale – design and maintain a high-availability platform processing millions of secure transactions daily across Europe. 2. Work with robust architecture – contribute to a backend designed for accuracy, security, and long-term maintainability by creating and optimizing (micro)services and improving database performance. 3. Be part of a focused, skilled team – collaborate with 25+ experienced engineers in agile teams, sharing knowledge and solving complex technical challenges in the world of payments. What started as five people, a small office, and a few nerf guns has grown into one of Europe’s fastest-growing fintechs. With 150+ colleagues, offices in Delft, Berlin, and London, and Worldline as our partner, we offer the perfect mix: the power of a global leader with the energy of a scale-up. At Online Payment Platform, we build the technology that powers the next generation of e-commerce. From eBay Kleinanzeigen to Ikea, tens of millions of users depend on our systems to process payments securely around the clock. This is your chance to join a vibrant, knowledge-sharing community where every line of code has a direct impact on millions of users. How we invest in you: We provide a total yearly salary of up to €95,000, a modern and flexible hybrid workplace, 24 vacation days plus 2 “supercharge-me” days, a 12-month contract with the possibility of permanent extension, and all the tools you need (MacBook, home office setup, NS Business Card). Enjoy an attractive bike plan for those working 24 hours or more, a developers-only office at Lange Geer 26 in Delft, catered lunches, and regular team drinks. From contact to contract: Let’s talk! Send your CV or get in touch with our tech recruiter, Gijs, at [email protected] or +31 6 31328865. “Did you know our APIs are called millions of times a day? Will you help keep our platform lightning-fast? Let’s connect!” – Mike, your hiring manager.