Test Engineer Performance and Automation Consultant

Mission Overview:

This opportunity is a consultancy mission at a client site, where you will represent Keystone Solutions as a Test Engineer Performance & Automation. As a Keystone Solutions consultant, you will be hired to work on client projects, bringing your expertise to dynamic environments and contributing to the success of our clients through our consultancy model.

Responsibilities:

All responsibilities will be carried out under Keystone Solutions’ consultancy framework:

• Ensure faster, quality releases by adopting effective regression testing in Agile and DevOps practices, ensuring timely delivery of high-quality products with end-to-end feature testing.
• Manage tests from creating test plans and test cases in Octane, developing automated tests, conducting integration tests, and supporting business acceptance tests.
• Collaborate closely with developers, product owners, and DevOps Teams to enhance test coverage, reduce manual testing efforts, and accelerate delivery while maintaining high standards of software quality.
• Plan, execute, and support different instances of Testing (Integration, Regression, Business Acceptance).
• Develop automated tests using Java, Rest-Assured, and Cucumber (BDD approach) to validate backend services for mortgage loan processing.
• Develop comprehensive test suites covering functional, regression, and contract testing for RESTful APIs, ensuring alignment with business requirements and technical specifications.
• Integrate the framework with CI/CD pipelines (e.g., Jenkins, GitHub Actions) to enable automated test execution in Agile sprints.
• Define and maintain test data strategies, including mocking external dependencies (e.g., mainframe APIs) to ensure isolated and reliable test execution.
• Analyze API responses for correctness, performance, and security, including validation of status codes, response payloads, headers, and error handling.
• Collaborate with developers to identify and troubleshoot defects, providing clear reproduction steps and logs for efficient resolution.
• Act as a quality advocate within the squad, promoting shift-left testing and test-driven development (TDD/BDD) practices.
• Participate in Agile ceremonies (refinement, planning, retrospectives) to contribute to testability improvements and risk mitigation strategies.
• Work with Product Owners to refine acceptance criteria and translate business rules into executable test scenarios (Gherkin).
• Monitor and report on test coverage metrics, defect trends, and automation efficiency to drive continuous improvement.
• Mentor junior team members on API testing best practices, tooling (e.g., Insomnia, Swagger), and automation techniques.
• Stay updated on emerging testing tools and methodologies and propose innovations to the squad.

Required Skills & Experience:

• Master’s degree or equivalent by experience.
• 5+ years of experience/seniority in IT Testing.
• 5+ years of experience in API test automation using Java, Rest-Assured, and Cucumber.
• Strong background in functional, regression, and integration testing for APIs.
• Ability to design test cases covering positive/negative scenarios, edge cases, and data-driven testing.
• Experience with mocking frameworks (e.g., Mockito, WireMock) to simulate dependencies.
• Hands-on expertise with RESTful APIs, including request/response validation, authentication (e.g., OAuth2, Basic Auth), and error handling.
• Proficiency in Java 8+ and Spring Boot for backend testing and mocking.
• Experience with version control (Git) and CI/CD tools (Jenkins, GitHub Actions).

Preferred Skills:

• Certifications in testing (e.g., ISTQB, Agile Testing) or API technologies (e.g., Rest-Assured, Insomnia) are a plus.
• Knowledge of Swagger/OpenAPI for API documentation and contract testing.
• Familiarity with databases (Oracle) and mainframe integrations (advantageous).
• Basic understanding of performance testing and security testing (OWASP principles).
• Understanding of credit/loan processes (mortgage lending is a strong plus).
• Experience in financial services or core banking systems is highly desirable.

Languages:

• English: Fluent
• French: Not required but nice-to-have
• Dutch: Not required but nice-to-have

Soft Skills:

• Analytical mindset: Ability to break down complex systems into testable components.
• Collaborative, transparent, and communicative: Works effectively with developers, DevOps, and business stakeholders.
• Proactive: Identifies gaps in test coverage and proposes solutions.
• Detail-oriented: Ensures accuracy in test data, assertions, and defect reporting.
• Adaptable: Thrives in a fast-paced Agile environment with evolving priorities.
• Mentorship: Willingness to share knowledge and uplift team members.

Work Location & Telework:

• Client site in Brussels with an expectation of 50% on-site and 50% homeworking.

Why Join Keystone Solutions?

• Consultancy Nature: Embrace your identity as a consultant, working on-site and representing Keystone Solutions in every engagement.
• Dynamic Projects: Experience a wide variety of challenges across different client environments, ensuring no two missions are ever the same.
• Turbo-Charged Learning: Accelerate your professional development and broaden your expertise through exposure to diverse technologies and methodologies.
• Skyrocketing Ambition: Grow your career within a framework that values ambition and supports your upward trajectory.
• K-Stone Values: As a K-Stone, you bring our core values—excellence, integrity, and collaboration—to every project and client interaction.

If you are ready to tackle technical and strategic challenges in a dynamic consultancy environment, apply today at Keystone Solutions Career Portal.