QA Engineer

Why you belong in our technology team:

• Work on mission-critical, high-impact systems enabling millions of platform users
• You believe in high quality products and are eager to design, build and implement test automation for a wide variety of applications, systems and user journeys.
• You thrive in an environment where everything revolves around tech. That’s why we’ve transformed an entire new location into a tech-only office, with all the tools, inspiring workspaces, and (not unimportant) the best coffee in Delft.
  
  
  

What you’ll do as a QA Engineer at Online Payment Platform

What started as five people, a small office, and a few nerf guns (to stay awake) has now grown into one of Europe’s fastest-growing fintechs. With 100+ colleagues, offices in Delft, Berlin, and London, and Worldline as a partner, we have the perfect mix: the resources of a global player with the energy of a scale-up. At OPP, we build the technology that powers the next generation of e-commerce. From eBay to Ikea, billions in transactions already flow through our systems. We don’t just handle payments—we enable platforms to accept, hold, and disburse funds securely.

As a QA Engineer, you’ll be responsible for ensuring the quality, reliability, and performance of our customer-facing web applications and APIs. You will:

• Design, implement, and execute comprehensive test plans for web applications, including KYC
• Automate back-end (API) front-end testing, and end-to-end workflows using tools of choice.
• Perform functional, integration, and regression testing on Laravel-based back-ends and React.js front-ends.
• Validate API functionality, error handling, and performance under various conditions.
• Conduct performance testing to ensure scalability and reliability.
• Ensure cross-browser and device compatibility, including accessibility and usability testing.
• Implement security and accessiblity testing for sensitive customer-facing workflows such as payment flows and onboarding flows.
• Track and document issues, test results, and improvements using Jira.
  
  
  

Your track record tells us

• At least 3 years of experience in a similar position.
• Experience in API testing (manual and automated) using tools like Postman or RestAssured.
• Strong understanding of REST API principles, HTTP methods, and JSON payloads.
• Hands-on experience with automated testing frameworks like Cypress, Playwright, or Selenium.
• Knowledge of performance, cross-browser compatibility, and usability testing.
• Familiarity with Laravel, PHP-based back-ends, and React.js front-ends.
• Experience integrating unit, functional, integration, and regression test suites within CI/CD pipelines
• Basic knowledge of security testing and compliance standards.
• Strong analytical skills with an eye for detail.
  
  
  

Our offer

• A modern, flexible workplace with hybrid working
• 24 vacation days and 2 supercharge-me-days ⚡
• 12-month contract with the possibility of permanent extension
• The tools you need: a MacBook, home office setup, and NS Business Card
• A developers-only office at Lange Geer 26, within walking distance of our sales and product teams in the heart of Delft
• A great work atmosphere with catered lunches and regular team drinks
  
  
  

From contact to contract

Want to know more about our projects?

Let’s talk! We’ll tell you everything you need to know. Send your CV or get in touch with our tech recruiter Gijs Cooijmans at [email protected] or +31 6 20019821.

👋 It's me, Mike, your hiring manager for this role.

Did you know our APIs are called millions of times a day? Will you help keep our platform lightning-fast? Let’s connect!