Senior Backend QA Engineer - Fintech, REST & CI/CD

BUX; Amsterdam; On-site; EUR 90,000 - 130,000; Full time

Job summary

BUX is looking for a Senior Quality Assurance Engineer (Backend) to join the Amsterdam-based engineering team. You will drive backend test automation, ensure financial accuracy, and safeguard regulatory compliance in a fintech platform.

You will collaborate with Product and Development to define done criteria, build robust QA processes, and monitor test coverage and quality metrics across services. This is a hands-on, fast-paced role with modern tech.

Qualifications

• 5–7+ years of software QA experience with hands-on testing in fintech.
• Strong manual and exploratory testing skills with test automation experience.
• Strong API testing (REST) knowledge and microservices/event-driven architectures.
• Hands-on with Selenium and Playwright using TypeScript.
• Proficiency in Java or Kotlin and CI/CD with GitHub Actions.
• Experience with Postman/Newman, Charles Proxy, and Xray.
• Ability to validate data across databases and event flows.
• Experience improving QA processes in Agile squads.

Responsibilities

• Design, develop, and maintain automated tests for backend REST services.
• Execute manual and exploratory testing where automation isn't feasible.
• Help build and mature QA processes and definitions of done.
• Apply quality gates and acceptance criteria with Product and Dev teams.
• Participate in design reviews to provide QA perspective early.
• Monitor quality metrics, coverage, and defect trends for backend services.
• Perform bug triage, reproduction, and prioritisation with Dev teams.
• Integrate regression, smoke, and integration tests into CI/CD (GitHub Actions).
• Support test environment setup and data provisioning with DevOps.
• Utilize GenAI tooling with sanitised data for test design, with human review.

Skills

5–7+ years exp

Manual testing

Exploratory testing

API testing (REST)

Selenium

Playwright

TypeScript

Java

Kotlin

CI/CD (GitHub Actions)

Postman/Newman

Charles Proxy

Xray

SQL / DB verification

QA processes in squad

Agile

Communication

Collaboration

Tools

Selenium

Playwright

Postman

Newman

Charles Proxy

Xray

GitHub Actions

Job description

BUX is looking for a Senior Quality Assurance Engineer (Backend) to join the Amsterdam-based engineering team. You will drive backend test automation, ensure financial accuracy, and safeguard regulatory compliance in a fintech platform.

You will collaborate with Product and Development to define done criteria, build robust QA processes, and monitor test coverage and quality metrics across services. This is a hands-on, fast-paced role with modern tech.