Quality Control Engineer - AI & LLM Services | AI Start-up | fixed-term Contract Join a European deep-tech leader in quantum and AI. A well-funded, fast-growing company backed by major global investors with its groundbreaking technology is already transforming AI, compressing large language models by up to 95% and cutting inference costs by 50–80%. This is your chance to be part of a team often described as a “quantum-AI unicorn in the making.”This is a Hybrid opportunity in Zaragoza. It is a fixed-term contract to work until 30th June 2026As our Quality Control Engineer, you will be the critical guardian of quality for our high-performance, AI-driven solutions and LLM services. This is a hands-on role where you will directly influence the reliability and scalability of cutting-edge technology deployed to our global client base. As a Quality Control Engineer, you will: Ensure the reliability and performance of AI solutions delivered to clients. Evaluate system quality for scalability, latency, and data integrity. Create and standardise quality control and reporting across projects. Develop and maintain comprehensive test suites for AI systems and ML workflows. Design and implement automated and manual testing for LLM applications (chatbots, RAG, APIs). Act as the point of contact for quality validation on final deliverables. Master’s degree in Computer Science, Data Science, Software Engineering, or a related field. ~2+ years of experience in software or ML project quality assurance, focusing on functional, performance, and automation testing. ~ Demonstrated understanding of testing methodologies for AI/ML systems (e.G., Familiarity with modern ML and LLM workflows (Python, APIs, cloud ML platforms). ~ Proficiency in English; Spanish or French is a plus. Compensation: Competitive salary, with a signing bonus and a retention bonus at the end of the contract. Flexibility: This is a hybrid role with flexible working hours. A relocation package is available if needed. We are a fast-scaling company committed to equal pay, diversity, and an inclusive culture. By applying to this role you understand that we may collect your personal data and store and process it on our systems.