Non-functional testing
Meet the standards for usability, performance, resilience and security that your users expect across all devices and platforms.
Find non-functional risks before your users do
Non-functional risks such as poor performance, instability under load, security vulnerabilities, or inaccessible experiences are often discovered too late.
We provide practical, end-to-end non-functional testing across performance, security, accessibility and usability.
Using certified testers, AI, and enterprise-grade tools, we spot issues early, so your systems are stable and secure. This helps you meet service level agreements and provide a consistent and safe digital experience.
What we offer
Performance, load and stress testing
Keep your apps fast, resilient, and reliable, even under peak loads, with AI-powered performance testing
Accessibility and usability testing
Ensure your apps are compliant and accessible to everyone with intelligent accessibility and usability testing.
Cyber security testing
Proactively detect threats and safeguard customer trust with cyber security testing.
CASE STUDY
Meeting energy regulatory challenge with non-functional testing
Resillion helped a leading UK energy supplier achieve compliance with the market-wide half-hourly settlement (MHHS) reforms by delivering end-to-end functional and non-functional testing.
Our team validated APIs, interfaces, and high-volume data flows under real-world conditions, simulating peak loads and ensuring system stability, scalability, and accurate data processing.
The result was assured regulatory compliance, reliable up-to-the-minute consumption data, reduced operational costs, and a scalable testing foundation to support future innovation.
Trusted by leading organisations
Helping organisations improve quality, resilience and delivery confidence across complex digital estates.
WHY US?
Why Resillion for non-functional testing
Why organisations choose Resillion for non-functional testing:
Total Quality approach
We connect performance, security, accessibility and usability testing, so risk doesn’t hide in the gaps between teams and tools.
Assurance across the lifecycle
Shift-left and shift-right delivery aligned to Agile/DevOps and CI/CD, not a last-minute test phase
AI-accelerated, human-led expertise
Certified specialists supported by AI and enterprise-grade tooling to find issues earlier and test smarter at scale.
Real-world validation
We test across devices, platforms, ecosystems and operating conditions, so what passes in test also performs in production.
Evidence-based outcomes
Clear, auditable reporting that supports SLAs, governance and compliance.
Integrated security strength
Cyber capability alongside QA to improve resilience, not just functional correctness.
Scale and consistency
Access to a global team to ramp quickly, support complex programmes and maintain continuity.
Flexible engagement models
Fully managed delivery or targeted support to strengthen in-house teams, depending on maturity and release pressure.
WHY NOW?
What happens if you delay non-functional testing?
of mobile site visitors will leave if a page takes longer than 3 seconds to load
of midsize and large enterprises report that one hour of downtime costs more than $300,000
When non-functional testing is left until late in the delivery cycle, teams often ship with sluggish user journeys and unstable services. Security exposures and accessibility gaps can often cost far more to remediate and can impact brand and trust.
By embedding performance, security, accessibility and usability testing across the delivery lifecycle, you can de-risk your launches.
Our experts
Dan Martland
Expert in Test Governance and Non-Functional Testing
With 30 years of experience, Dan brings a deep and broad understanding of software quality and how to test it effectively.
Elliot Kimmel
Expert in Test Automation, ETL, Performance Testing and Delivery Strategy
Elliot is a Quality Engineering professional with over 27 years of experience delivering enterprise-scale testing and quality solutions across complex technology environments.
Explore
Take a look at our other testing services under Digital Assurance, such as:
Testing support services
