Are you passionate about shaping the future of Artificial Intelligence? We are seeking a skilled AI Prompt Engineer to join our dynamic Commercial Digital team. In this role, you will take ownership of the behavior of Large Language Model (LLM)-driven agents in production.Working within an established framework, you will develop and tune prompts, design evaluations for individual AI agents, and implement self-optimizing feedback loops. Your mission is to ensure our customer-facing AI outputs remain highly accurate, on-brand, legally compliant, and cost-efficient.Key ResponsibilitiesDevelop & Tune Prompts: Craft and maintain high-performing prompt architectures—including system prompts, tool instructions, guardrails, and output schemas—for production AI agents.Evaluate & Test: Build and execute evaluation suites and regression tests for individual agent behavior. Define quality metrics and acceptance thresholds in collaboration with business owners.Optimize Performance: Design and operate A/B testing for prompt and model variants,



utilizing feedback loops that learn from human review outcomes to focus on single-agent optimization.Drive Cost Efficiency: Support LLM optimization efforts, focusing on model selection, context-window management, structured outputs, and token efficiency.Guard Quality & Tone: Maintain tone-of-voice and multi-language consistency for customer-facing communications, utilizing professional British English B2B standards as the baseline.Risk Mitigation: Stress-test guardrails against adversarial inputs, edge cases, and hallucination risks within defined safety standards before prompt release.Document & Collaborate: Document prompt patterns, test coverage, and evaluation results, enabling business users and reviewers to provide structured feedback.Reporting Line & AutonomyReporting: You will report directly to the Head of Commercial Digital, receiving day-to-day technical guidance and mentorship from our Level A Senior Prompt Engineers.Autonomy:

📌 Prompting Engineer (España)
🏢 Malvern Panalytical
📍 España