Tester medior

Join Keystone Solutions as a consultant to support our client in the Belgian energy sector on a consultancy mission. As a Keystone Solutions consultant, you will plan and execute the SAT test scope, collaborate closely with the client and their vendor, and contribute to Market and DGO testing streams. This engagement emphasizes hands-on test execution, first-line defect analysis during major releases, and clear multilingual communication with stakeholders at the client site.

• →Plan and execute the SAT test scope for Business as Usual changes, satellite applications, and projects.
• →Support the client's vendor by providing inputs for the setup of test automation scripts.
• →Support Market and DGO testing by performing first-line analysis on incoming defects logged as part of a major release.
• →Execute sanity and regression testing using a semi-automated tool; perform manual testing for the functional aspects of changes.
• →Communicate with the vendor and analysts in the language of the user (French, Dutch, or English).
• →Extend test support towards DGO and Market parties by executing DGO and Market tests when requested.
• →Log defects and follow up until resolution; organize first-line support for major releases.
• →Execute ad hoc requests from the client's analysts.

• Testing is executed mostly in a waterfall approach, with an agile approach also used and gradually extended.

• Message Exchange (MeX): Structure, Rectification, Measure/Bill.
• Batch Treatment (BT): Infeed and Settlement.
• Infrastructure changes: Upgrades, purging, configuration changes, connectivity changes, etc.

• Test automation execution, security, failover, and pure technical tests (these are covered by service vendors).
• BI domain responsibilities (not part of this request).

• Proven experience as a Test Specialist: 3 years, Medior level.
• Proven experience in writing test scenarios.
• Proven experience with formal test methods and techniques.
• Demonstrated knowledge of the English language at minimum CEFR C1; able to communicate fluently in English (project language).
• Proven experience as a Functional Tester: 5 years, Medior level.
• Proven experience with at least one of the following customer-related processes: structure, measure, cross domain, billing, infeed, settlement.
• Proven experience with SOAP/UI, XML, and SQL.
• Proven experience with SQL, including writing and executing queries.
• Proven experience working with Technical Design Documents (if/then/else logic).
• Proven experience with Waterfall test methodology.
• Proven experience within the Belgian energy sector.
• Language requirement: Dutch-speaking or French-speaking at CEFR C1.
• ISTQB Certification (Foundation level or higher).

• Proven experience as a tester in an Agile/Scrum project.
• Proven experience with DevOps and VBScript.

• Proven experience with test automation.

• This is a consultancy mission delivered by Keystone Solutions. You will work on-site at the client location as a Keystone Solutions consultant, collaborating daily with client stakeholders and their vendor.
• You will carry out all listed responsibilities under Keystone Solutions' consultancy model while working closely with the client's teams.

• Engage with diverse testing challenges across the client's service domains, from Message Exchange and Batch Treatment to infrastructure changes, adapting to both waterfall and agile contexts.

• Strengthen your expertise in SAT, functional testing, defect analysis, and cross-domain energy processes while collaborating with client analysts and vendors in a multilingual environment.

• Grow your impact by taking ownership of end-to-end test execution, first-line defect analysis during major releases, and the expansion of DGO and Market testing.

• As a K‑Stone, you bring professionalism, accountability, and collaborative excellence to every client engagement, ensuring quality, transparency, and reliable delivery throughout the testing lifecycle.

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