Senior QA Engineer

We are a team of experts bringing together the best talents in IT and analytics. Our mission is to deliver impactful solutions through our flagship service — building tech teams from scratch and scaling existing ones — helping our partners become truly data-driven organizations.Currently, we are looking for a Senior Quality Assurance Engineer to join a global analytics team responsible for building data-driven applications and analytical solutions that support key business decisions.The team operates as a centralized global analytics hub with the ambition to strengthen data-driven decision-making and develop smart data products used in everyday operations across multiple business functions.The environment is shaped by an innovative spirit and a strong data-first mindset. From sales and logistics to marketing and procurement, the solutions developed by the team help turn complex data into practical insights and better decisions.The Global Analytics team is a diverse group of Data Scientists, Data Engineers, MLOps Engineers, Data Analysts, BI Specialists, UX Designers, and Analytics Translators, working across several countries and continents. Collaboration, innovation, and reliability are at the core of how the team operates.As the team continues to expand its analytics solutions globally, we are looking for an experienced Senior Quality Assurance Engineer who will help ensure the reliability, stability, and correctness of the web applications used by business stakeholders.About the projectYou will work on a suite of data-driven products that support commercial investment decision-making. These solutions allow business users to create, compare, and evaluate complex investment scenarios.The ecosystem includes:business-critical web applications (React frontend, Django backend)a data collection portala machine learning and modeling frameworkoptimization engines (linear optimizer and genetic algorithm)Power BI dashboards for insight explorationAzure-based infrastructureThe web applications are the primary interface used by business users to manage investment scenarios and evaluate outcomes, making their quality, stability, and usability a top priority for the team.Your roleAs a Senior Quality Assurance Engineer, your main responsibility will be ensuring the quality and reliability of the web applications used by business stakeholders to create, organize, and compare investment scenarios.You will take ownership of end-to-end testing of React and Django applications, ensuring that business logic, workflows, and optimization outputs behave correctly and consistently from the user perspective.You will also support quality assurance across the broader ecosystem — including APIs, data flows, and analytical components — always focusing on protecting the user experience and maintaining trust in the decisions supported by the system.What you will doEnsure web application qualityOwn end-to-end testing of web applications (React frontend and Django backend)Design and execute functional, regression, and integration testsValidate business workflows such as scenario creation, editing, and comparisonTest complex user journeys, edge cases, and error handlingVerify correctness of business logic exposed in the UITest backend services and APIs powering the applicationsEnsure releases meet a high standard for usability, correctness, and stabilityBuild and improve test automationDevelop and maintain automated tests for web applications and APIsWrite maintainable test code using Python and/or JavaScriptIntegrate automated tests with CI/CD pipelines in AzureFocus automation on high-risk and regression-prone user flowsContinuously improve test coverage and execution speedValidate integration with analytical componentsTest how the applications consume outputs from optimization engines and analytical modelsValidate correctness and stability of optimization resultsEnsure UI behaves correctly in edge scenarios and unexpected outputsCollaborate with data scientists to define testable expectations for model behaviorSupport platform qualityTest critical data flows impacting the web applicationsValidate outputs used in analytical dashboardsPerform integration and smoke testing across Azure-based componentsSupport investigation of production issues and root cause analysisHow you will workCollaborate closely with frontend engineers, backend engineers, data scientists, and product managersParticipate early in feature design discussions to advocate for testabilityCommunicate quality risks and trade-offs clearlyAct as a quality partner for the engineering team, not only a gatekeeperWhat we’re looking forMust-haveStrong experience testing web applicationsExperience testing frontend (React) and backend (Django or similar frameworks)Solid experience with API testingHands-on experience with test automationStrong analytical mindset and attention to detailAbility to understand complex systems and user workflowsNice to haveExperience testing data-driven or decision-support systemsFamiliarity with machine learning or optimization concepts (from a testing perspective)Experience working with Azure environmentsExposure to Power BI or analytical dashboardsWhy join usIf you want to:take part in the development of complex data and analytics solutionswork on innovative data products used globallysee the real business impact of your workcollaborate with international teams of engineers, analysts, and data scientistsinfluence how quality is built into modern analytics systemsgrow your skills in a fast-evolving technology environmentit’s probably a good match.What we offerflexible working hoursremote-friendly work modelprivate medical careMultisport cardrelaxed and collaborative working environmentopportunities for professional development (courses, certifications, knowledge sharing)If interested please let us get to know you by sending your CV using 'Apply' button.Please add to your CV the following clause:'I hereby agree to the processing of my personal data included in my job offer by hubQuest spółka z ograniczoną odpowiedzialnością located in Warsaw for the purpose of the current recruitment process.”If you want to be considered in the future recruitment processes please add the following statement:'I also agree to the processing of my personal data for the purpose of future recruitment processes.”