Functional Testing
Guarantee every business-critical function works every time across web, mobile and connected devices
We provide comprehensive, mature functional testing services, from validating requirements to user acceptance and post-release verification. Using smart test prioritisation, enterprise-grade tools and certified testers, we fast-track defect detection and reporting across all devices and environments.
The aim: to prevent re-work and stop defects turning into expensive failures.
What we offer
We specialise in key functional testing environments, such as:
Web and mobile testing
Deliver flawless web and mobile experiences with AI-powered end-to-end testing.
Test automation
Accelerate software delivery with AI-assisted test automation that scales with your team.
CASE STUDY
Smart energy product launch – Functional testing that delivers
We helped a UK energy supplier launch a complex smart energy product with full end-to-end functional validation across web, mobile and connected devices. Every critical journey was rigorously tested to ensure it worked exactly as designed.
Combining automated and manual testing, we caught and fixed issues early, cutting rework.
The result?
A smooth launch for thousands of customers, with complete confidence that every function performed flawlessly across platforms.
Trusted by leading organisations
Helping organisations improve quality, resilience and delivery confidence across complex digital estates.
WHY US?
Why Resillion for Functional Testing
Testing embedded into delivery
Our experienced testers work across Agile, DevOps and traditional methodologies, embedding functional testing into CI/CD pipelines and validating changes continuously, not just at the end of the release cycle. This means earlier defect detection, faster feedback and shorter release cycles for you.
Independent, certified expertise
Functional testing is delivered by our fully certified, experienced test teams, providing independent validation across web, mobile and connected device environments. Resillion also operates authorised and accredited testing labs, strengthening credibility for regulated and high‑risk programmes.
AI‑assisted testing that scales
We combine manual functional testing with AI‑assisted automation, using smart test prioritisation, enterprise‑grade tools, and self‑healing automation to accelerate delivery while maintaining coverage across devices, platforms and environments
Evidence‑driven results
Every test, defect and resolution is tracked in our Functional Test Coverage Matrix, providing clear traceability back to requirements and transparent, auditable evidence for stakeholders, governance teams, and regulators.
End to end assurance for complex launches
We deliver end‑to‑end functional testing across all testing phases, right from requirements validation through pre‑production, making sure that core user journeys, features and integrations work as you intended.
WHY NOW?
What happens if you delay functional testing?
Of software defects are found post-release when testing is delayed or fragmented
The cost of fixing a defect after release is two to three times higher than catching it earlier in development
Treating functional testing as an afterthought can expose you to avoidable risk.
Disconnected functional testing slows release cycles and ultimately reduces confidence in your products.
By embedding functional testing across all stages of the lifecycle, you’ll speed up your launches and delver impressive user experiences.
Our experts
Conor Thomson
Expert in Quality Engineering and AI Practices
Conor is a Global Solution Architect with 12 years’ experience in Quality Engineering, QA, test automation, software delivery, AI engineering, and digital transformation.
