Senior Test Engineer – B2B Contract (EU Work Permit Required)

About the role

We are seeking an experienced Senior Test Engineer for a long‑term B2B contract with a key customer in Luxembourg. The role involves owning both manual and automated testing, defining the test strategy, and ensuring the quality of critical business workflows in a complex enterprise environment.

Key responsibilities

• Define test strategy, planning and prioritisation across multiple streams.
• Design, implement and execute manual and automated test cases.
• Build and maintain Selenium test automation frameworks and manage test environments.
• Automate REST API testing using REST Assured and validate REST and SOAP services.
• Test complex business workflows built with Temporal or similar orchestration tools.
• Develop automation using Java and TestNG as core technologies.

Required profile

• Minimum 5 years of professional testing experience.
• Strong hands‑on expertise with Selenium WebDriver and Java.
• Proven experience with TestNG and REST Assured.
• Deep understanding of REST and SOAP services testing.
• Experience testing workflow engines such as Temporal, Camunda or Airflow.
• Ability to define a test strategy from scratch and lead testing efforts.
• Fluent English; Luxembourgish or French a plus.
• EU nationality or a valid Luxembourg work permit; onsite availability.

Required skills

• Selenium WebDriver
• Java
• TestNG
• REST Assured
• REST
• SOAP
• Temporal (or similar orchestration)
• Camunda
• Airflow

What we offer

• Long‑term contract until 31/12/2026 with possible extensions.
• Competitive daily rate of 500 EUR (B2B, excl. VAT).
• Fast start – ASAP.
• Opportunity to work on a modern tech stack with business‑critical impact.