QA automation vs QA manual: differences and when to hire each profile

The quality of software has ceased to be a final phase of development and has become a continuous process that accompanies the entire lifecycle of an application. Each new feature, update, or integration poses a potential risk if there are no adequate validation processes in place. For this reason, tech teams are increasingly incorporating professionals specialized in Quality Assurance (QA) to detect errors before they reach users.

When a company decides to strengthen its testing team, a common question arises: Do we need a manual QA or a QA automation engineer? Although both profiles share the same goal —ensuring software quality— their functions, tools, and ways of working are very different. Choosing correctly not only improves product stability but also optimizes development times, reduces costs associated with incidents, and facilitates the continuous evolution of the platform.

In this article, we analyze the differences between QA automation and QA manual, when to incorporate each profile, and how to build a testing strategy tailored to your company's needs.

What does a QA engineer do?

A QA engineer is the professional responsible for verifying that an application functions correctly before it reaches the end user. Their work involves identifying errors, validating functional requirements, and ensuring that each new version maintains the expected quality. Depending on the company's testing strategy, a QA may specialize in manual testing, automated testing, or combine both disciplines.

Their work usually encompasses validating functionalities, designing test cases, executing functional tests, automating repetitive tests, detecting and documenting incidents, collaborating with developers and product owners, and continuously improving the quality process. In Agile teams, QAs participate from the early phases of development to prevent errors rather than just detecting them at the end of the project.

What is a manual QA?

The manual QA performs tests directly on the application, simulating the real behavior of users. Their goal is to ensure that each functionality meets the defined requirements and that the user experience is coherent. Their main responsibilities include executing functional tests, detecting usability errors, validating new developments, verifying business processes, reviewing interfaces, and providing detailed reports of incidents.

This profile brings a human judgment that is still essential for identifying problems that are difficult to automate, such as user experience, design, navigation, process fluidity, and validating new developments. Manual testing remains fundamental in virtually any software project.

What is a QA automation engineer?

The QA automation engineer automates repetitive tests through code and specialized tools. Instead of manually executing hundreds of validations after each new version, they develop scripts capable of performing those checks automatically. This allows for thousands of tests to be executed in a few minutes and detects regressions before deploying a new version.

The main functions of this profile include developing automated scripts, automating functional tests, integrating with CI/CD pipelines, maintaining the testing framework, executing continuous tests, and optimizing the Quality Assurance process. The goal is not to completely replace manual testing but to automate those repetitive tasks that consume the most time.

QA automation vs QA manual: main differences

Although both profiles work to improve software quality, their responsibilities are distinct.

Far from competing with each other, both profiles often complement each other within the same development team.

Most used tools in QA automation

The growth of testing automation has driven the adoption of specialized tools that allow for efficient test automation. Selenium is the historical standard for automating web tests across multiple browsers. Cypress is very popular in applications developed with JavaScript technologies due to its speed and ease of use. Playwright is one of the fastest-growing tools, allowing for test automation in Chromium, Firefox, and WebKit with great stability.

Postman is especially used to validate REST APIs and automate tests on backend services. Appium is a framework specialized in automating mobile applications for iOS and Android. TestComplete is an enterprise platform for automating functional tests in both web and desktop applications.

When to hire a manual QA?

Although automation has transformed the way applications are validated, manual testing remains essential in numerous projects. A manual QA brings human judgment, analytical capability, and a user experience-focused perspective that is difficult to replace with automated scripts.

This profile is particularly recommended when developing a new functionality, as it is necessary to validate that the functionality is stable before automating a test. It is also key for conducting exploratory tests that allow for discovering unexpected errors by navigating through the application as an end user would. Additionally, it is crucial when evaluating the user experience in aspects such as navigation, usability, or design. In very dynamic projects where functionalities change every few weeks, starting with manual testing is often more efficient than automating processes that are still unstable.

When to hire a QA automation engineer?

Automation begins to provide enormous value when the application reaches a certain level of maturity. At that point, manually repeating the same tests after each deployment becomes inefficient. A QA automation engineer is particularly recommended in projects with frequent deployments, where the team publishes new versions weekly or even several times a day.

It is also key in organizations that work with continuous integration (CI/CD), where they need to continuously validate that each change does not break existing functionalities. In large applications, the greater the number of functionalities, the more cost-effective it becomes to automate regression tests. In Agile teams, automation allows for maintaining delivery speed without sacrificing quality. And in products with a large number of users, detecting errors before deployment reduces risks and improves the end-user experience.

Manual QA and QA automation do not compete: they complement each other

One of the most common mistakes is to think that a QA automation engineer completely replaces a manual QA. In reality, both profiles are part of the same quality strategy. The manual QA is responsible for the initial validation of functionalities, exploratory testing, reviewing user experience, complex cases, and new developments. The QA automation engineer handles repetitive tests, regression, continuous integration, automated validations, and mass execution of test cases. More mature organizations combine both profiles to achieve a more efficient Quality Assurance process.

Benefits of incorporating specialized QA engineers

Investing in quality is not just about finding errors. It means reducing risks throughout the entire development cycle. By incorporating specialized QAs, companies achieve higher software quality, as incidents are detected before reaching production. They also achieve cost reductions, because fixing an error during development is much cheaper than doing so once published. Deployments are faster thanks to automation, which reduces the time required to validate new versions. The user experience improves, as more stable applications generate greater satisfaction and trust. And the team gains productivity, as developers can focus on building new functionalities while the validation process remains integrated within the development cycle.

How lateam works with QA teams

At lateam, we help companies in Europe and the United States incorporate specialized QA engineers through IT outsourcing and Team as a Service models. We select profiles tailored to the maturity level of each project. Depending on the client's needs, we incorporate manual QA engineers, QA automation engineers, test engineers, automation specialists, and complete Quality Assurance teams.

Our professionals regularly work with tools such as Selenium, Cypress, Playwright, Postman, Appium, and TestComplete, integrating with Agile methodologies and CI/CD processes. The goal is for the quality area to cease being a final phase of development and become a continuous process that provides stability to the product and reduces risks throughout the software lifecycle. You can learn more about our working model at lateam, discover how to incorporate specialized talent from Quiero Talento, consult more resources on our Blog, or contact our team.

Frequently asked questions

What is the difference between a manual QA and a QA automation engineer?

The manual QA executes tests manually to validate functionalities and detect user experience-related errors. The QA automation engineer develops scripts that automate repetitive tests and allow for continuous software validation.

Is it better to hire a manual QA or a QA automation engineer?

It depends on the project. Products in early stages tend to benefit more from manual testing, while established applications gain significant advantages by incorporating automation. The most common approach is to combine both profiles.

What tools do QA automation engineers use?

Some of the most used include Selenium, Cypress, Playwright, Postman, Appium, and TestComplete, as well as continuous integration frameworks and test management tools.

When is it advisable to automate tests?

When there are repetitive processes, frequent deployments, continuous integration, or applications with a large number of functionalities that require constant validations.

Can a QA automation engineer work with Agile teams?

Yes. In fact, automation is part of many Agile and DevOps strategies, allowing for validation of each change before deploying new versions.

Can a QA integrate with our internal team?

Yes. QA engineers work as an extension of the client's team using their methodologies, tools, and development processes.

Conclusion

The quality of software no longer solely depends on finding errors before launch. Today, it is part of the development process itself. Choosing between manual QA and QA automation does not mean opting for one profile over another, but rather identifying what the project truly needs at each moment.

Manual tests provide human judgment, exploratory capability, and functional validation. Automation, on the other hand, allows for faster deployments, reduces repetitive tasks, and maintains a high level of quality as the application grows. Companies that achieve better results do not replace one profile with another. They build Quality Assurance strategies where both work complementarily to ensure more stable, secure, and adaptable products.

Incorporate QA engineers ready to ensure the quality of your software

At lateam, we help companies in Europe and the United States incorporate manual QA, QA automation engineers, and complete Quality Assurance teams through IT outsourcing and Team as a Service models. If you are looking to strengthen your testing strategy with specialized professionals, visit Quiero Talento, learn how we work at lateam, explore more resources on our Blog, or contact us to discuss your project's needs.