> Markdown version of [/jobs/ext/9235-test-engineer-data](https://www.wearedevelopers.com/jobs/ext/9235-test-engineer-data). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md).

---

# Test Engineer (Data)

- **Company:** Open Cosmos Ltd.
- **Location:** Harwell Oxford, UK
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Automation of Tests, Code Coverage, Continuous Integration, Data Validation, Data Integrity, Data Streaming, Strategies of Testing, Delivery Pipeline, Backend, Data Layers, Data Management, Front End Software Development, Api Design
- **Published:** May 14, 2026
- **Apply:** https://uk.indeed.com/viewjob?jk=9c66a822c664edc5

## About the Role

Do you have experience in Analysis skills?, * 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

## Description

As a Test Engineer in the Data Team you will help ensure the quality and reliability of the DataCosmos platform, testing everything from frontend interfaces and APIs through to data flows and platform behaviour as we continue to scale our products and capabilities.

You'll be:

 * 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


## Related Videos

- [API Design - Getting Started](https://www.wearedevelopers.com/videos/33-api-design-getting-started)
- [Developing the Backend with Stefan Lingler, CTO at Shpock](https://www.wearedevelopers.com/videos/100360-developing-the-backend-with-stefan-lingler-cto-at-shpock)
- [Why Your AI Agent Keeps Hallucinating Your Data: Building Deterministic Context Layers](https://www.wearedevelopers.com/videos/2055-why-your-ai-agent-keeps-hallucinating-your-data-building-deterministic-context-layers)
- [Continuous testing - run automated tests for every change!](https://www.wearedevelopers.com/videos/190-continuous-testing-run-automated-tests-for-every-change)
- [Rest API Antipatterns](https://www.wearedevelopers.com/videos/100208-rest-api-antipatterns)
- [Nest.js - TypeScript in the backend can also be clean](https://www.wearedevelopers.com/videos/1033-nest-js-typescript-in-the-backend-can-also-be-clean)

## Related Articles

- [The 8 Best Code Testing Tools](https://www.wearedevelopers.com/magazine/402-the-8-best-code-testing-tools)
- [The Most Popular IT Jobs on the Market](https://www.wearedevelopers.com/magazine/376-the-most-popular-it-jobs-on-the-market)
- [Data Engineer Salary UK](https://www.wearedevelopers.com/magazine/253-data-engineer-salary-uk)
- [The 12 Best Jobs for Software Engineers](https://www.wearedevelopers.com/magazine/401-the-12-best-jobs-for-software-engineers)
- [Data Analyst Salary in the UK](https://www.wearedevelopers.com/magazine/278-data-analyst-salary-in-the-uk)
- [Integration And E2E Testing: Are They Complementary or Interchangeable?](https://www.wearedevelopers.com/magazine/86-integration-and-e2e-testing-are-they-complementary-or-interchangeable)