QA tester role and how to build a career in software testing

A QA tester checks that software works as intended, meets its requirements and gives users a smooth, reliable experience before launch.

Imagine a checkout button that freezes or a login screen that won't load on your phone. A QA tester finds those problems before users do. They test apps, websites and business systems, document every defect they find and confirm that each fix works, so the final product is stable, secure and ready to use.

It's a strong route into tech if you notice details others miss and enjoy figuring out why something breaks. The role puts you at the centre of the development team, working daily with programmers, analysts and product owners.

A solid technical foundation helps you stand out. The Degree in Computer Engineering at Universidad Europea covers programming, software engineering and computer security, and includes internships where you work on real projects.

What is a QA tester?

A QA tester checks that software meets its functional and technical requirements before it reaches users. They find defects, test different scenarios and confirm that every fix works.

Think of a payment form that charges a customer twice. QA testers catch problems like this early and document them clearly for the development team to resolve.

Quality assurance (QA) is broader than testing. It is a preventive approach that runs through the whole software development lifecycle and sets the processes that stop defects from appearing. Testing is one activity within QA, and it means running the software systematically to uncover bugs and verify fixes.

QA testers work daily with developers, product managers and business analysts. To do that well, you need to understand a product's technical requirements and how real users will interact with it.

What does a QA tester do?

A QA tester works across the whole software development lifecycle, not just on the finished product. Their main responsibilities include:

• Analysing requirements to spot ambiguous specifications and decide which scenarios need testing
• Writing test plans and test cases that define what to check and what result to expect
• Running functional tests to confirm each feature behaves as specified
• Performing regression testing after every change to make sure existing features still work
• Testing APIs to verify that software components exchange data correctly
• Logging defects with clear steps so developers can reproduce them
• Retesting fixes to confirm that reported issues are resolved
• Reporting results so the team has a clear picture of software quality

Testing is either manual or automated. Manual testing means using the software directly, and it works best for exploratory testing, usability problems and cases that need human judgement, such as a confusing sign-up flow.

Automated testing uses scripts and specialised tools to run repeatable checks. It saves time when the same tests must run often, for example after every software update.

Which skills and tools does a QA tester need?

A QA tester needs a mix of technical knowledge, analytical thinking and communication skills. Knowing the software development lifecycle and agile methods such as Scrum and Kanban is essential, as is understanding how requirements become features and how defects move through a team.

The main tools and technical skills include:

• Selenium, Cypress and Playwright for automated testing
• Postman for API testing
• Jira for recording and tracking defects
• Git for version control
• Basic programming to write and maintain automated tests
• Databases, web technologies and HTTP requests to understand how applications work behind the screen

Technical skills are only half the picture. Attention to detail and critical thinking help you spot edge cases, such as a form that breaks when someone pastes an emoji into the name field.

Communication matters just as much. You need to explain what went wrong, give clear steps to reproduce it and work with developers to fix it.

The ISTQB Certified Tester Foundation Level is a recognised certification that complements your degree or work experience with a solid grounding in testing principles.

How can you prepare for a career as a QA tester?

Start with a computing degree, then build testing skills through hands-on projects. A degree in computing or software engineering gives you a foundation in programming, databases and application development, so you understand how the software you test is designed and built.

Practical projects turn that knowledge into experience. Test a personal app or website, write test cases for an existing project or learn an automation framework such as Selenium or Cypress.

As you gain experience, you specialise in areas such as test automation, API testing, performance testing or security testing. These paths lead to more technical QA roles and a deeper understanding of how software is built.

A career in QA goes well beyond finding bugs. It combines technical knowledge with investigation, communication and problem-solving, which makes you a valuable member of any development team.