Software Testing Engineer Career:
What Do Testers Do? 
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A tester’s job pays very well, but it requires perseverance and the ability to deeply immerse oneself in a project. A software testing engineer performs a critical function in the development of digital products. This specialist verifies the functionality of applications, websites, and software systems before they reach end users.
This profession opens doors to the IT industry even for those without programming experience, as it initially requires analytical thinking and attention to detail rather than deep technical knowledge. Learning this specialty is relatively quick and straightforward, but even at the initial stage, you’ll need to master fairly complex testing tools. Among popular platforms for learning and getting started in the profession, Skillbox comes to mind first; you can find a specialized course here: https://skillbox.kz/course/profession-test/
Main responsibilities of a specialist
A tester’s work begins long before the first line of code is written. During the project planning stage, a QA engineer participates in analyzing business requirements and defining product acceptance criteria. They review technical documentation, identify potential risks, and create a test plan based on the specified requirements.
During development, the specialist works closely with the programming team. This collaboration helps the tester understand the implementation details and ensure that requirements are correctly translated into code. In parallel with development, the preparation of test scenarios and verification of unit test coverage begins.
The testing process itself involves performing various types of checks. The engineer logs discovered defects, creates detailed error reports, and passes them on to the developers. After fixing the bugs, the tester verifies that the problem has been resolved and that no new errors have appeared.
Types of testing in professional practice
Specialists use a variety of software testing methods. Regression testing ensures that changes made do not break existing functionality. Testers update regression test suites and perform checks after each new build, prioritizing areas based on changes in the codebase.
Load testing answers questions about application performance under expected and peak loads. An engineer develops performance testing scenarios, uses specialized tools, and identifies system bottlenecks.
Exploratory testing becomes necessary when predefined test cases fail. A specialist conducts checks based on their own expertise, which helps uncover rare issues in edge cases.
Manual and automated testing
Manual testing relies on the human factor. The tester directly interacts with the application, identifying issues through direct interaction with the interface. This method is particularly effective for complex tests that require human judgment and is indispensable for evaluating the user experience.
Automated testing uses software scripts to perform predefined checks. Automated tests provide high accuracy for repetitive tasks and are cost-effective for regression testing across multiple development cycles. Automation specialists must be proficient in programming languages such as Python, Java, or JavaScript.
Modern testers often combine both approaches. Manual testing is used for exploratory work and user interface verification, while automation handles routine, large-scale tasks.
Test design techniques
Professional testers use structured methods for creating effective test cases. Static techniques include analysis and review of software artifacts without executing them. Formal evaluation of documentation or code helps identify defects early, reducing the cost of fixing them.
Dynamic techniques focus on verifying the functionality and behavior of a system. Black-box techniques test the external behavior of a program without knowledge of the internal structure of the code. These include equivalence class partitioning, boundary value analysis, and decision table testing.
White-box testing techniques examine the internal structure and logic of a program. The specialist analyzes the coverage of statements, branches, and code execution paths. Experience-based methods leverage the tester’s knowledge and intuition gained from working on similar projects.
Test documentation
High-quality documentation forms the foundation of professional testing. A test plan details the testing strategy, scope, project budget, and deadlines. The document identifies testing levels, types of checks, and required resources.
Test cases provide step-by-step instructions for performing specific tests. Each case describes preconditions, execution steps, and expected results. Bug reports document discovered defects with detailed reproduction steps and actual system behavior.
Test progress reports keep stakeholders informed of progress. Engineers use metrics from the test plan to compare actual progress with planned progress and take necessary actions to achieve goals.
Structure of vocational training
Comprehensive educational programs in testing include approximately 150 hours of theory and 300 hours of practical training. Training begins with an introductory module introducing the fundamentals of software development, the participants involved, and the seven principles of testing.
The first stage focuses on manual testing of web application interfaces and mobile platforms. Students learn how to create test artifacts — checklists, bug reports, and test cases. They also explore the testing lifecycle, requirements management, and various types of testing.
The second stage deepens knowledge of functional testing. Future specialists are introduced to the tools testers use daily, such as bug tracking and test case management systems. They also master test design techniques for validating forms and fields, including equivalence classes, boundary values, and pairwise testing.
Client-server architecture and API testing
The third stage of the program introduces students to the world of client-server architecture. Specialists learn to test analytics in mobile applications, work with browser developer tools, and understand client-server interactions. They also study the REST API, the five main HTTP request methods, and error codes.
The fourth stage focuses on testing software interfaces using specialized services. Students learn to read API specifications, work with databases, and use the SQL query language. Security testing and network request verification are added.
Practical projects include testing real websites and mobile apps based on technical specifications. Students conduct functional testing of online stores, verify the correctness of server requests, and compile detailed reports on their results.
Choosing a programming language
After mastering manual testing, the program offers a choice of three languages for writing automated tests. Python has a simple syntax and is suitable for beginners. Students learn the basics of the language, operators, loops, functions, and working with floating-point numbers.
Java represents a more formal approach to programming. Training includes setting up a development environment, learning data types, working with the Git version control system, and the basics of object-oriented programming through classes and methods.
JavaScript is focused on web development. This course covers variables, strings, arrays, objects, working with the Document Object Model (DOM), and asynchronous operations for interacting with the server.
UI Test Automation
Specialized automation modules teach writing automated tests for user interfaces in the chosen language. Students master automation tools and explore various methods for searching page elements, including CSS selectors and XPath locators.
The practical training includes interacting with interface elements, setting expectations, and validating results. The final projects involve creating comprehensive automated test suites for website testing, covering key user scenarios.
Additional specializations
Advanced programs include modules on game testing. Students are introduced to the Unity game engine, the basics of C# programming, and the specifics of game project testing. Practical assignments include developing and testing simple games across various genres.
In-depth SQL training helps testers work more effectively with databases. The course covers complex queries, table joins, data grouping, and database performance optimization.
Modern programs integrate training in artificial intelligence. Specialists master neural network prompting and the use of AI assistants for code analysis and error detection. Neural networks help speed up routine tasks and generate test data.
Career prospects
Junior-level testers can expect to work on their first projects after just six months of training. The profession offers clear career progression: after a few years of experience, a tester can become a team lead, move into project management, or focus on quality architecture.
Specialists are in demand across dozens of industries — from the financial sector to the gaming industry, from healthcare systems to government portals. Remote work allows for collaboration with teams from anywhere in the world, expanding opportunities for professional development.
Testers with automation skills receive higher compensation than their colleagues who perform only manual checks. The combination of technical knowledge, analytical skills, and understanding of business processes makes test engineers valuable members of any development team.