Senior QA Engineer Performance & Scalability

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London QA We're looking for a Senior QA Engineer, Performance & Scalability who doesn't wait to be told what to test. You'll own performance and scalability across our platform, 30+ microservices, event-driven flows, and the legacy dependencies that come with a real production system at scale. This isn't a "run a load test before release" role. This is a role where you make performance a first-class concern from day one, where you define the thresholds that decide pass or fail, and where you hold the bar when something is degrading and nobody yet knows why. You'll be the performance voice in…