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) and 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 impact

• 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