We are increasingly demanding and impatient with technology. Applications that do not work well generate a negative impact on users, inevitably causing loss of money, time and reputation for developer companies.

The testers are the professionals in charge of ensuring the proper functioning of the applications. Their mission is to guarantee that everything meets the defined criteria and that the user does not perceive any defect in the work carried out. Currently, software development is not conceived without carrying out this type of testing, since it is the main way to ensure software highest quality.

Software testing or software QA is a discipline in software engineering that executes tests related to a program or application and a work methodology with the aim of locating software errors. It can also be described as the process of validation and verification of a software program or an application. As our product is being built, we have to perform software testing tasks to prevent functionality issues and correct software deviations before release.

At a high level, software testing is necessary to detect bugs in the software and to test whether the software meets customer requirements. This helps the development team to fix bugs and deliver a good quality product. There are various points in the software development process where human error can lead to software that does not meet customer requirements.
In this article, some of the best software testing firms are presented.

QAlified

Is an IT firm specialized in quality assurance and software testing. It was born in Uruguay. Its principal services are software testing consulting and workshops, application and mobile testing, performance testing, test automation, manual testing, security testing, accessibility testing and usability testing.

Sii Poland

Sii provides easy-to-implement testing services, enabling the client to improve its business results. With Sii, costs are optimized, the testing process is accelerated and time to market is reduced. Also, its experts can assist your team in whatever testing activities you need.
The firm´s headquarters are located in Warsaw, Poland. Its revenue is approximately $230 million. It has over 4900 employees.
Its core services are Continuous Testing, Test Automation, Performance Testing, Web Security Testing, Embedded Testing, and Managed Test Service Partnership. Among its most notable clients, we can find DPD Group, Roche, Leica Geosystems, Sabre, Puma, NXP, Reckitt Benckiser, Scalepoint and Ingenico Group.

ScienceSoft

The ScienceSoft team, which includes ISTQB certified test engineers, incorporates testing experience gained from 30 years in the market and professional knowledge from multiple industries (healthcare, retail, manufacturing, banking, telecommunications, etc.) and technology domains (SCM, CRM, B2B and B2C Portals and eCommerce, among others).
ScienceSoft's testing process complies with ISO 13485 and its test documentation processes meet the requirements set forth by ISO/IEC/IEEE 29119-3:2013.

DeviQA

DeviQA is located in Kyiv, Ukraine. Its number of employees is between 10 to 100 employees. Among its core services, it provides web app testing, mobile app testing, automation testing, performance testing, consulting and QA auditing. Its most remarkable clients are InGo, FindHotel, expressHR, BusinessApps and XOLA. It is an awesome firm as it offers full-cycle quality control services.

QualityLogic

QualityLogic is headquartered in California, USA. Concerning its revenue, its FOB Reference Price is US$9-10M. Its number of employees is somewhere between 100 to 200 employees. Its main services are Mobile and web app testing, automation testing, API testing, Big Data analytics and telemetry. Its most relevant clients are Cisco, At&t, openADR, Verizon Wireless HP, HighTail, eHarmony, Hawaiian Electric and Adobe. It is an amazing firm that provides a flexible service model, ongoing ROI and ground support.

TestingXperts

TestingXperts is headquartered in Mechanicsburg, USA. Concerning its revenue, its FOB Reference Price is US$10-25M. It has between 1000 to 5000 employees. Among its most important services, we can find Testing consultancy and advice, functional and non-functional testing, and other specialized testing services like Mobile application testing and Data migration. Its most distinguished clients are in the financial services, banking, insurance, healthcare and retail/e-commerce industries. It is a really awesome firm as it offers highly flexible solutions that adapt to its clients´ needs, and it constantly delivers its amazing services on time. It is certified by ISO quality procedures.