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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Data Test Engineer - **Company:** Northern Trains - **Location:** Leeds, UK - **Salary:** £43,850.0 - **Contract:** Permanent contract - **Skills:** Java (Programming Language), Amazon Web Services, Automation of Tests, Microsoft Azure, Behavior-Driven Development, Cloud Computing, Encodings, Continuous Integration, Data Infrastructure, Extract Transform Load (ETL), Database Queries, Database Testing, Python (Programming Language), Systems Integration, Google Cloud, Test-Driven Development (TDD), Data Lakes, Data Analytics, Data Management, Programming Languages - **Published:** May 14, 2026 - **Apply:** https://uk.indeed.com/viewjob?jk=22538d03f87f5e19 ## About the Role Do you have experience in Test-driven development?, Data testing isn't just something you do - it's something you think about. You understand how data moves, where it can go wrong, and how to catch issues before they cause problems. A few things you'll bring with you: * Experience testing data platforms, data lakes, or ETL (Extract, Transform, Load) processes * Strong SQL skills and experience with at least one programming language such as Python, Java, or Scala * Confidence working with data testing or validation tools - for example Great Expectations, dbt, or similar * An understanding of automated testing approaches, including Test-Driven Development (TDD) and Behaviour-Driven Development (BDD) * Familiarity with cloud platforms such as AWS, Azure, or Google Cloud, and modern data technologies * A collaborative approach - you're comfortable working with both technical teams and business stakeholders * A problem-solving mindset, with the curiosity to dig into data and the drive to improve how things work If you've helped teams move from manual testing to smarter, automated approaches - even better. ## Description Data can tell powerful stories - but only when it's trusted. As part of our team at Northern, you'd be the person making sure that trust is well placed. Working at the heart of our Data and Analytics function, you'd help shape how data is tested, validated, and relied on across the business. From customer journeys to operational performance, our decisions depend on data being accurate, complete, and ready when it's needed. That's where you come in. You'd bring an engineering-led approach to testing, blending hands-on manual testing with smart automation to make sure our data platform and data lake deliver quality at scale. What you'll be doing You'll play a key role in building confidence in Northern's data, making sure it stands up to real-world use and supports better decision-making across the organisation. * Designing and building automated testing frameworks to validate data across pipelines, transformations, and datasets * Carrying out manual testing where it adds the most value, especially for complex scenarios * Embedding testing into the data lifecycle - from ingestion through to transformation and delivery * Working closely with data engineers, analysts, and platform teams to define test approaches and quality standards * Integrating automated tests into Continuous Integration and Continuous Deployment (CI/CD) pipelines so quality is built in, not bolted on * Spotting data issues early, investigating root causes, and working with teams to resolve them * Creating clear documentation and reporting on data quality, risks, and testing outcomes * Contributing to better ways of working by improving frameworks, standards, and reusable tools * Supporting audit and compliance needs by ensuring testing is traceable and well documented ## Related Videos - [A Brief History of Data Storage](https://www.wearedevelopers.com/videos/974-a-brief-history-of-data-storage) - [Empowering Retail Through Applied Machine Learning](https://www.wearedevelopers.com/videos/976-empowering-retail-through-applied-machine-learning) - [The Cloud is Calling: Answer with In-Demand Skills](https://www.wearedevelopers.com/videos/945-the-cloud-is-calling-answer-with-in-demand-skills) - [Continuous testing - run automated tests for every change!](https://www.wearedevelopers.com/videos/190-continuous-testing-run-automated-tests-for-every-change) - [JSON and Beyond](https://www.wearedevelopers.com/videos/968-json-and-beyond) - [Testing .NET applications a Tool box for every developer](https://www.wearedevelopers.com/videos/704-testing-net-applications-a-tool-box-for-every-developer) ## Related Articles - [Data Engineer Salary UK](https://www.wearedevelopers.com/magazine/253-data-engineer-salary-uk) - [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) - [Software Engineer Salary London](https://www.wearedevelopers.com/magazine/252-software-engineer-salary-london) - [Data Analyst Salary in the UK](https://www.wearedevelopers.com/magazine/278-data-analyst-salary-in-the-uk) - [Fullstack Developer Salary UK](https://www.wearedevelopers.com/magazine/251-fullstack-developer-salary-uk)