We are looking for a Senior Quality Assurance Engineer (Backend) to join our BUX team based in Amsterdam.
Our engineering team sits at the heart of the company. We have a well-rounded team that cares about building great products that matter. You'll be part of a modern fintech company where you can try things, break things, fix them, and learn fast. Your work is visible, your input matters, and you help shape both the product and how we build it. We stay close to what's happening in the world of investing and fintech, and we share what we learn. It's a place where you can stretch your skills, contribute to something real, and grow alongside people who take their craft seriously and enjoy building things together.
In a fintech environment, quality is not just about catching bugs; it's about ensuring financial accuracy, maintaining regulatory compliance, and safeguarding our users' trust. You'll play an active hands-on role in upholding quality across the backend services that power our platform.
As a Senior Quality Assurance Engineer for our App Backend team, your job is to get things done. This could mean:
Design, develop, and maintain automated tests (integration, end-to-end, regression) for backend REST services
Execute manual and exploratory testing where automation is not feasible
Help build and mature QA processes, standards, and definition of done within the squad
Apply quality gates and acceptance criteria in close collaboration with Product and Development teams
Participate in design reviews for owned backend features to provide a QA perspective early in the development cycle
Monitor and track key quality metrics, test coverage, and defect trends for backend services
Perform bug triage, reproduction, and prioritisation with development teams
Integrate automated regression, smoke, and integration test suites into CI/CD pipelines (GitHub Actions)
Support test environment setup, data provisioning, and maintenance in coordination with DevOps
Use approved GenAI tooling with sanitised data to accelerate test design and automation, subject to human review, security policies, and validation of generated tests
Our tech stack
Java, Kotlin, Spring Boot, GCP, Kubernetes, GitHub Actions, REST APIs, Selenium, Playwright/TypeScript, Postman/Newman, Charles Proxy, Xray, CloudSQL, PostgreSQL
We are looking for you if you are passionate about quality, you have strong hands-on testing skills, and you thrive in a fast-paced fintech environment. Furthermore, we require:
5–7+ years of experience in software quality assurance, with a senior-level track record of hands-on testing in the fintech domain
Strong hands-on manual and exploratory testing skills alongside solid test automation experience
Strong knowledge of API testing (REST) and microservices/event-driven architectures
Hands-on experience with test automation frameworks such as Selenium and Playwright with TypeScript
Proficiency in at least one programming language (Java/Kotlin)
Understanding of CI/CD pipelines and integration of automated tests (GitHub Actions)
Practical experience with Postman/Newman, Charles Proxy, and Xray (or similar test management tooling)
Comfortable validating data consistency across multiple database technologies and asynchronous event flows
Experience helping establish or mature QA processes within a squad or team
Experience working in a fast-paced Agile environment
Excellent communication and collaboration skills with cross-functional teams
This role reports to the Staff QA Engineer
Nice-to-haves
Experience with fintech or financial services testing (financial accuracy, transactional data, regulatory compliance)
Experience with performance and security testing
Knowledge of financial regulations and compliance standards (KYC/AML)
Familiarity with event-driven and event sourcing architectures
You will have a real impact on quality for a high-growth fintech company that serves thousands of users
You will work with modern backend technologies and have the freedom to introduce better testing practices
You'll collaborate with experienced, passionate engineers who value quality and continuous improvement
You'll be part of a company that values your ideas and encourages innovation at every level
You will help build products that democratize investing and make a real difference in people's financial lives
