Principal Engineer - AI Tester | Cambridge, UK

SGI • Cambridge, England, GB • £68 - £75 / hour • 3d ago

Principal Engineer - AI Tester Location - Cambridge Hybrid working Rate - £550-600

Key Responsibilities:

• Perform functional, performance, and security testing on cloud-native services deployed on Microsoft Azure. • Design and implement automated test suites for APIs, service components, and AI pipelines. • Automate the evaluation of AI system outputs to ensure accuracy, consistency, and safety of responses. • Collaborate with developers and data scientists to establish service-level quality metrics and observability hooks. • Validate services against AI regulatory frameworks and ensure traceability, fairness, and robustness in outcomes. • Participate in threat modelling and security validation of exposed APIs and AI services. • Provide feedback early in the lifecycle to reduce defects and improve design. • Mentor junior testers, encourage continuous learning, and contribute to a culture of innovation. AI & Cloud Expertise

• Familiarity with LLM evaluation techniques, output scoring, and validation frameworks. • Understanding of key concepts such as prompt engineering, RAG, model orchestration, and hallucination detection. • Experience in testing for accuracy, relevance, and consistency of AI model predictions/generations • Defining Performance Metrics for AI services and testing for the same • Awareness of AI safety, bias detection, and explainability techniques. • Experience ensuring compliance with AI regulations and standards (e.g., NIST AI RMF, EU AI Act). • Strong belief in ethical AI practices, transparency, and end-user trust. Core Skills and Qualifications:

• 12+ years of experience in software testing, QA, or validation roles for cloud-native applications using Microsoft and .NET technologies. • Proficient in designing automated testing frameworks • Hands-on experience with Azure DevOps, CI/CD pipelines, and containerized test environments. • Strong understanding of API testing, performance profiling, and security testing (including OWASP top 10). • Excellent problem-solving skills, with the ability to analyse complex technical challenges and propose scalable solutions. • Experience working in Agile teams and collaborating across global R&D locations • Demonstrated ability to mentor junior team members fostering a culture of continuous learning and innovation

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