We are working with a Tier 1 UK bank undergoing a significant engineering uplift within their Corporate Digital function. As part of this transformation, they are strengthening their Non-Functional Testing capability across their mobile estate to ensure scalability, resilience and production stability at enterprise scale. This is a senior role focused on performance, load and endurance testing across customer-facing mobile applications. The successful candidate will play a key role in defining performance testing strategy, identifying bottlenecks early in the lifecycle, and working closely with engineering teams to ensure robust and secure releases within a highly regulated environment. Key Responsibilities: Design and implement non-functional testing strategies for mobile platforms Develop and execute load, stress and endurance testing scenarios Use tools such as JMeter or LoadRunner to simulate real-world traffic and peak usage Interpret application behaviour to define appropriate performance test scope Conduct root cause analysis on performance issues and collaborate with developers to resolve defects Integrate performance testing into CI/CD pipelines Identify performance risks and escalate where necessary Influence testing standards and contribute to enterprise quality practices Required Experience: Strong hands-on experience in non-functional testing for mobile applications Experience with performance testing tools such as JMeter or LoadRunner Ability to design and execute large-scale load and stress testing scenarios Strong Java knowledge to understand backend application behaviour Experience working in enterprise or regulated environments Ability to interpret performance results and provide actionable insights Highly Desirable: Experience in banking, fintech or payments Exposure to behaviour-driven testing frameworks such as Cucumber Experience leading or mentoring testers Location: Northampton or Knutsford