Test Engineer, Data

Open Cosmos

Test Engineer ensuring the quality and reliability of the DataCosmos platform at Open Cosmos. Collaborating with teams to define testing strategies and improve automated testing processes.

Posted 6/14/2026full-timeHarwell • 🇬🇧 United KingdomMid-LevelSeniorWebsite

About the role

Key responsibilities & impact

Help ensure the quality and reliability of the DataCosmos platform, testing everything from frontend interfaces and APIs through to data flows and platform behaviour.
Defining and implementing testing strategies across platform features and releases
Designing, building, and maintaining automated tests for frontend and backend systems
Carrying out manual and exploratory testing across user journeys and edge cases
Validating data flows, outputs, and platform reliability
Collaborating with engineering and product teams to define acceptance criteria and test coverage
Supporting CI/CD pipelines and improving automated testing within release cycles
Identifying gaps in coverage and driving improvements in testing practices and frameworks
Investigating defects across UI, API, and data layers
Reviewing user and admin documentation to ensure clarity and alignment with system behaviour.

Requirements

What you’ll need

Ability to design reliable and repeatable tests using manual and automated approaches
Understanding of different testing strategies including integration, regression, system, and exploratory testing
Ability to build automated tests for web UIs and APIs using modern testing frameworks
Understanding of API-driven systems and client-server architectures
Ability to validate data integrity, transformations, and outputs within data platforms
Awareness of CI/CD practices and testing within release pipelines
Strong analytical thinking and attention to detail when identifying defects and inconsistencies
Understanding of user workflows and the ability to test from different user perspectives
A collaborative and pragmatic approach, balancing speed and quality in a scaling environment.

Benefits

Comp & perks

Work at the cutting edge of space technology with customers around the globe.
A mission-driven company making space accessible to help solve real-world challenges.
A diverse, ambitious, and supportive team.

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

automated testingmanual testingexploratory testingintegration testingregression testingsystem testingAPI testingdata validationtest strategy designtest coverage

Soft Skills

analytical thinkingattention to detailcollaborationpragmatic approachproblem-solving