Functional Testing Services for Reliable, High-Performing Applications

Functionality is vital in the digital world, and if your app isn’t functioning correctly, it will struggle to compete. Partner with CelticQA Solutions and make sure your software does what it needs to do. 

Ensure your software functions flawlessly—on every device, every time.

CelticQA’s functional testing services validate every critical feature of your application so you can launch with confidence. We partner with enterprise teams across healthcare, financial services, insurance, manufacturing, retail, and more to ensure applications meet business goals and user expectations—without compromise. 

Customer focused
Value oriented
Quality obsessed
People centric

Why Functional Testing Matters

Functional testing verifies that your application performs exactly as intended. It ensures your system behaves correctly under expected conditions—validating user flows, integrations, business rules, and edge cases. 

Benefits of functional testing:

Our Functional Testing Services

CelticQA provides comprehensive end-to-end functional testing tailored to your tech stack, goals, and release cycles. 

 

Smoke Testing

Quick, high-level tests to ensure builds are stable enough for deeper testing.

Sanity Testing

Verifies core functionality after changes to ensure the system works as expected before regression testing.

Regression Testing

Checks that updates, bug fixes, or new features don’t break existing functionality.

Integration Testing

Validates that individual software modules work together correctly to avoid system-level issues.

What We Test

Our QA functional testing services cover all critical aspects of application functionality: 

Mainline Functions

Does your core software functionality work as intended?

Basic Usability

Are navigation, workflows, and interactions smooth and user-friendly? 

Accessibility

Is the application usable across devices and inclusive for all users? 

Error Conditions

Are clear, meaningful error messages shown under failure conditions? 

We replicate real-world user behavior to validate your application’s readiness for production environments. 

Need to scale quickly? We have the QA capacity ready to support your next release. 

The CelticQA Advantage

Why Choose Us as Your Functional Testing Partner?

20 years in software testing services

QA expertise across the U.S., UK, and Ireland

Expertise in 15+ industries

Trusted by 100+ enterprise clients in healthcare, finance, pharma, logistics, insurance and more

Proprietary Frameworks & Methodologies

Custom frameworks and methodologies that deliver faster, more accurate results

The right team bandwidth for your project

Access to an expert QA team when you need it. Our response is extremely fast.

Vast test automation toolkit

Tool-agnostic approach tailored to your tech stack. We are certified partners of Ranorex.

Multi-Award winning QA testing company

Award-winning QA solutions backed by agile, rapid-response teams

experience excellence

Partner with CelticQA for Functional Testing

When functionality falters, so does trust—impacting your brand, revenue, and compliance. CelticQA delivers reliable, real-world testing to ensure your software performs flawlessly for the users who count on it.

Our Automation Tool Capabilities

Our Locations
Markets We Serve

USA

Experience quality assurance with our expert QA Testing Services in the USA.

UK

Elevate your software quality with our tailored Software QA Testing Services in the UK.

Ireland

Quality assurance for your software made easy with our experienced Software QA & Testing Services in Ireland.

Brands That Trust Us

Our Key Clients

Schedule Your Free Functional Testing Consultation

Let’s eliminate guesswork and deliver flawless functionality.

Let's discuss your Software Functional Testing Needs
Schedule A Call
Let's Talk

Atlanta, USA
+1-866-343-5250

Dundalk, Ireland
+353 42 934 3200

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office hours

Atlanta, USA
MON – FRI: 9 AM to 5 PM

Dundalk, Ireland
MON – FRI: 9 AM to 5 PM