Software Testing Engineer

[ introduction ]

The tester ensures software quality.

The tester's task is to find errors (bugs) and control quality.

Usually, the work looks like this:

  • review the program requirements
  • create and run checks (test cases)
  • write a report on found bugs (bug report)
QA engineer with a cat and a cup of coffee

QA engineer salary level in 2026

When searching for jobs, you may often see the abbreviation QA — Quality Assurance Engineer.

QA is a tester who participates in improving processes related to product quality.

An easy start and high income make it easy to start a career in IT as a tester.

Salary statistics based on job vacancy analysis using artificial intelligence
JUNIOR MIDDLE SENIOR
> 2 200 € > 3 200 € > 4 500 €

Example of a testing task

The website introduces a new feature — «User Registration».

The analyst described the requirements:

for example, minimum password length and email format.

• Password — minimum 8 characters
• Email in format: valid@example.com

The developer wrote the code

according to the requirements.


public void isValid(User user) {
    if (user.password.length() < 8) {
        throw new ValidationException();
    }

    if (!user.email.matches(pattern)) {
        throw new ValidationException();
    }
}

The QA engineer starts testing 

✅ Positive cases:
• Successful registration with valid data

❌ Negative cases:
• Password less than 8 characters
• Invalid email (e.g., test@)
• Empty fields

What does a QA engineer do?

  • studies the requirements
  • communicates with analysts and developers while diving into the details of the user registration process
  • sketches out a user scenario:
    1. The user enters a username, email, and password
    2. Clicks the "Sign up" button
    3. The system validates the data and confirms the registration
  • describes a set of situations , which need to be reproduced during the scenario, using checklists, test cases and others
  • verifies compliance of the implemented feature with the requirements, applying various testing approaches and methods
  • creates bug reports in case errors are found
  • verifies bug fixes and drinks coffee

Test registration
(you can try it out)

Which field in the «Test Registration» causes the bug to appear?
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