A QA (quality assurance) engineer makes sure software works the way it should before it reaches users. They plan tests, try to break features in ways real people might, write clear bug reports, and increasingly write automated tests that check the software every time the code changes.
A QA engineer career suits people who are curious, careful and slightly suspicious by nature: the kind of person who reads a form and immediately wonders "what if I leave this blank?" or "what if I type my name in Arabic?" It is a respected role in its own right, and also a common route into tech for career switchers.
This guide covers what QA engineers do, the difference between manual and automated testing, the skills and tools you need, and how to start.
What does a QA engineer do?
The core job is to find problems early, when they are cheap to fix, rather than letting users find them. Day to day, that includes:
- Understanding requirements. Reading what a feature is supposed to do and spotting gaps before any code is written. ("What should happen if the payment succeeds but the confirmation SMS fails?")
- Planning tests. Writing test cases or checklists that cover normal use, edge cases and error situations.
- Testing. Running those tests, exploring the software freely to find unexpected problems, and checking that fixes really work.
- Reporting bugs. Writing reports that let a developer reproduce the problem quickly: steps, expected result, actual result, environment, screenshots or logs.
- Automating tests. Writing code that runs checks automatically, often as part of the team's release pipeline.
- Regression testing. Making sure new changes have not broken things that used to work.
Imagine a team releasing an update to a banking app. A QA engineer might test transfers on different phones, with poor network conditions, with the wrong PIN entered three times, and with an amount that exceeds the balance. Each of those scenarios could hide a bug that would be expensive and embarrassing in production.
Manual testing vs automated testing
| Manual testing | Automated testing | |
|---|---|---|
| How it works | A person runs the tests and observes the results | Code runs the tests and reports results |
| Best for | New features, exploratory testing, usability, one-off checks | Repetitive checks, regression testing, checks on every code change |
| Skills needed | Attention to detail, product understanding, clear writing | Programming, test frameworks, Git, CI/CD |
| Typical entry point | Often where beginners start | Increasingly expected for QA engineer titles |
Both matter. Automation cannot replace human curiosity, and manual testing alone cannot keep pace with teams that release frequently. In job adverts, titles like "QA analyst" or "manual tester" often lean manual, while "QA engineer", "SDET" (software development engineer in test) or "automation engineer" usually expect coding.
The honest market picture is that pure manual testing roles are increasingly competitive, and adding automation skills makes you considerably more employable.
What skills does a QA engineer need?
Testing skills
- Test design techniques, such as boundary values (if the limit is 100, test 99, 100 and 101) and equivalence partitioning.
- Exploratory testing: investigating software with curiosity rather than only following scripts.
- Bug reporting: precise, reproducible, neutral in tone.
- Understanding the development process, including agile ways of working and where testing fits.
Technical skills
- A programming language for automation. JavaScript/TypeScript, Python and Java are all common.
- Web automation tools such as Playwright, Cypress or Selenium.
- API testing with tools like Postman, and with code.
- SQL to check data directly in the database.
- Git and CI/CD, so your tests run automatically when code changes.
- Browser developer tools for investigating front-end issues.
Traits that help
QA rewards process orientation (structured, thorough work), debugging persistence (narrowing down exactly when a bug happens), and communication and empathy (reporting problems without making developers defensive, and thinking like a user). If you want to see whether these come naturally, take the free TechDNA assessment. QA Engineer is one of the nine roles it scores.
What does a typical day look like?
A QA engineer on a product team might:
- Join the morning stand-up to see which features are ready for testing.
- Test a new feature against its requirements, then explore it beyond them.
- Log two or three bugs and discuss one of them with the developer.
- Update the automated test suite to cover the new feature.
- Investigate why an automated test failed overnight: is it a real bug, a test problem, or a flaky environment?
- Join a planning session and raise questions about upcoming features before they are built.
That last point is important. Good QA engineers prevent bugs, not just find them, by asking awkward questions early.
How to start a career in QA
Step 1: Learn testing fundamentals
Understand what testing is for, the main types (functional, regression, integration, performance, security, usability) and test design techniques. Practise writing test cases for apps you already use.
Step 2: Practise on real software
Pick a website or app and test it as if you were on the team. Write test cases and bug reports in a document. Some open-source projects welcome bug reports, which gives you public evidence of your work.
Step 3: Learn a programming language
JavaScript or Python are good choices. freeCodeCamp and the python.org tutorial are free places to start, and TechLearnX offers free foundation courses in programming and Git.
Step 4: Learn automation
Learn Playwright or Cypress for web testing, and practise API testing. Write a small automated test suite for a public demo site or one of your own projects.
Step 5: Put it in a pipeline
Use GitHub Actions to run your tests automatically on every push. This shows you understand how testing fits into modern development.
Portfolio ideas
- A test plan and bug report collection for a real public website, written professionally.
- An automated test suite for a sample web application, with a clear README and CI running on GitHub.
- API tests for a free public API, covering both success and error cases.
- A short write-up of an exploratory testing session: what you tried, what you found, and how you prioritised it.
Common mistakes
- Treating QA as an "easy" entry point. It requires real skill, and good testers are valued for it.
- Staying manual-only. Automation skills widen your options considerably.
- Writing vague bug reports. "It doesn't work" wastes everyone's time. Precise steps get bugs fixed.
- Ignoring the user. Software can pass every test and still be confusing to use. Speak up about that too.
QA careers from Nigeria
Fintech, banking and telecoms companies place a high value on testing, because errors involving money or customer data are costly. QA roles also appear in remote and outsourced teams that serve international clients. As with any remote role, a reliable power and internet setup matters.
Where can QA lead? Senior QA and test lead roles, automation architecture, performance testing, security testing, product management, or software development. If you are weighing QA against development directly, read QA engineer vs software developer. And if you consider yourself detail-oriented, our guide to tech roles for structured, detail-oriented people is worth a look.
Frequently asked questions
Do QA engineers need to code?
Manual testers may not, but most QA engineer roles now expect at least some automation, which means coding. You do not need to be as strong as a full-time developer at first, but programming skill makes a big difference to your options.
Is QA a good career for beginners?
It can be a good entry point, especially for people who are thorough and like finding problems. Be aware that entry-level manual roles can be competitive, so learning automation early helps you stand out.
Can I move from QA to software development?
Yes, and many people do. Writing automated tests builds real programming skills and a deep understanding of the product. Making the move usually requires deliberately building development projects alongside your QA work.
Which automation tool should I learn first?
Playwright and Cypress are popular modern choices for web testing, and Selenium remains widely used in established teams. Check job adverts in your target market, then pick one and build a real project with it.
If you notice what others miss and enjoy figuring out exactly why something went wrong, software testing could suit you well. Take the free TechDNA assessment to see your fit for QA Engineer and eight other roles. You can also try a QA role challenge to test your current knowledge.