Development

Unlocking: Why QA Is Important in Custom Software Development

8 mins | Published: March 28, 2025

TL;DR

Three types of QA specialists cover the field: manual (functional/GUI), automation testing, plus narrow-focus roles for security, performance, and usability testing.
Defects are nearly unavoidable. Human fatigue, overlooked requirement conflicts, developer blind spots on integration, deadline pressure, and expanding complexity all contribute.
Trained QA specialists outperform project managers or devs-doing-QA. Deeper knowledge, higher speed, focus on product quality, plus tech skills like API testing.
Complete testing is impossible — users and apps interact in endless ways. QA focuses on high-impact scenarios and regression coverage as complexity grows.
Earlier QA involvement cuts cost dramatically. A defect found in testing is far cheaper to fix than one found by users after release.

Every business wants to get a running app without bugs and defects. There is a special place in software development companies for people responsible for software quality assurance. Such specialists have various job titles such as Quality Assurance engineers, Quality Assurance specialists, testers, or software testing engineers.

The role of a Quality Assurance specialist in project development is hard to overestimate, and the cost of a high-level tester in the project expenditure statement is high. However, are the QA specialists really so necessary for the project?

Some software development companies try to use project managers as Quality Assurance specialists and don’t hire testers.

Some business owners believe that high-class developers will write perfect code for their apps with no defects, no bugs, and no integration issues.

Some clients are ready to test their product by themselves in trying to decrease the project expenditure statement.

Is this the correct approach? Why is QA important in software development? What is special about being a QA specialist? What is software testing, and can everybody run tests? Why don’t developers just stop fooling around and start making bug-free software? What are the benefits of different types of testing that QA specialists perform?

We will cover all these questions in our article and try to dispel the myths about quality assurance.

What is software testing and who is a Quality Assurance specialist

Software testing is the process when someone executes software components and elements using manual or automated tools to find an answer to the question “Does the system match expected requirements from the business and customers?”

A Quality Assurance Specialist is a team member who checks whether the app works correctly in such a way to meet users/business requirements.

Types of QA specialists:

Manual (functional and GUI) – they run manual tests to identify bugs, issues, and defects in the software.
Automation testing – they design automated tests to check the functionality of applications.
Narrowly targeted: Security testing, Performance, Usability.

Who runs tests when there are no Quality Assurance specialists. Pros and cons of every alternative

Who runs tests?	Pros	Cons
Nobody	Rapid software development and delivery (competitors are terribly jealous)	Financial losses of the business due to software malfunctioning (for example, the downtime of web marketplace for 1 hour because of an unnoticed defect leads to losses of more than $1,000). Loss of customer loyalty and target audience – no one wants to use and pay for software with defects. Falling satisfaction/motivation of employees and the development team. A bad reputation because of negative reviews from customers.
A client	Strong expertise in the business domain and a good awareness of required functionality because of direct participation in the development Can add new Change Requests after testing	An hourly rate is much higher than a Quality Assurance specialist has. A client should take actions that will lead to business growth, not run quality control tests. Lack of opportunities for quick software testing because clients are busy with developing their businesses. Little defects or inconvenient elements can be overlooked due to the lack of expertise in testing and the lack of knowledge about best practices in the field. Only standard flow tests are usually carried out, not complex functional testing.
Project Manager	Good awareness of required functionality	A PM hourly rate is higher than a QA rate. PM attention is taken away from their main task: setting processes and building effective teamwork. Loss of motivation because testing is not a desired activity for PM.
Developers (doesn’t apply to unit testing)	Know the code well and what it’s supposed to do. They can both check the code as developers and check the functionality as users.	The hourly rate of developers is higher than a Quality Assurance rate. Testing performed by developers leads to the delay in bug fixes and development of new features. If a developer overlooks some use-case during the development phase, most likely, it will be overlooked during testing. It’s required to know and understand business requirements to test the code written by another developer. So developers who run quality control tests have to waste their time reading and acknowledging business requirements.

Why defects are almost unavoidable in the development

The human factors – fatigue and lack of focus
Overlooked conflicts in requirements
Developers don’t always consider the app as an integral system while writing code
Developers don’t use the system in such a way as a final user does
Developers usually know the relationships between the functional blocks they are responsible for but aren’t aware of the relationships between functions across the whole system
Specialists may perform worse under deadline pressure
The complexity of the system and integration – developers may check the correctness of the work of every isolated module, but don’t check end-to-end scenarios where the integration between all modules is involved
Defects accumulate as the product’s functionality gets more complicated, which requires more regression tests
In cases of frequent changes in requirements, it’s easy to overlook some of them

Benefits a Quality Assurance specialist brings to the project

A trained QA specialist is always better than another type of specialist who runs quality control tests as an additional responsibility. The reason why hiring a skilled QA specialist is important is the following:

Their testing knowledge is deeper and richer than a layperson’s, and they work faster
Focus on product quality without being distracted by other duties
More tech-savvy specialist with skills in:

the use of the test console
API testing
running specific mobile tests

Well-known manual testing of the whole app after the development phase is not the only type of testing a Quality Assurance specialist performs. Look through the table below:

Type of testing	What for?
Testing of requirements	Makes sure that requirements don’t have logic errors and inconsistencies -> fixing them during the writing of requirements is cheaper than after the development stage. QA specialists can help to make more complete requirements. Their expertise allows seeing not evident scenarios that were overlooked during the requirements gathering.
Acceptance testing of new features (NFT – New Feature Testing)	Prevents the delivery of malfunctioning software to final users after the release of a new feature
Integration testing	Modules in the app are interconnected and interdependent. The implementation of a new feature can affect the work of the existing features. That leads to the necessity to check the integration of new features with existing modules.
Regression testing	Defect fixing can lead to software regression issues (defects in modules that have been already tested and worked well earlier). Refactoring and any code changes increases the probability of software regression issues appearing.

Some principles and postulates of testing

Complete and comprehensive testing is impossible:

Users and apps interact in numerous different ways. It’s impossible to test them all
Various mixes of runtime environments – people deal with a vast market for smartphones, browsers, and OS versions
The human factors – fatigue and lack of focus
Frequent features delivery – can affect the choice of priority areas for testing at the moment
Early testing:
The cost of fixing bugs in the early stages (writing and approving requirements) is less than during the testing phase
Testing quality depends on conditions:

There is a budget and time limit
There is a priority for tests based on the ongoing situation, the deadlines, and the desired results

QA specialists with solid experience are ready to help

If you have trouble hiring a skilled QA specialist and constantly find new bugs in your software, look at SumatoSoft. We stand for a professional and holistic approach to quality assurance and keep the number of bugs to a minimum before release.

Since 2012, the SumatoSoft team has come to know a lot of hidden hazards in software development and testing, which allows us to develop the software in the right way with a minimum number of bugs.

Do you want bug-free software? Contact us!

Conclusion

We hope you have no doubts about why QA is important in software development. Quality Assurance specialists are vital elements of the development team. They save nerves, money, user loyalty, and reputation. Hiring a Quality Assurance specialist is an investment that will produce returns in the form of high customer satisfaction and good motivation of the development team.

Unfortunately, defects are unavoidable during app development, but QA specialists can minimize the number of issues and bugs before the app is released. And the sooner you involve a tester in the development process, the better app you get and the less money you spend. A defect that was identified at the testing phase costs much less than a defect that was found by users after the release – that is the main reason why QA is important in software development.