We are looking to fill this role **immediately** and are reviewing applications daily. Expect a fast, transparent process with quick feedback. **Why join us?** We are a European deep\-tech leader in quantum and AI, backed by major global strategic investors and strong EU support. Our groundbreaking technology is already transforming how AI is deployed worldwide — compressing large language models by up to 95% without losing accuracy and cutting inference costs by 50–80%. Joining us means working on cutting\-edge solutions that make AI faster, greener, and more accessible — and being part of a company often described as a “quantum\-AI unicorn in the making.” **We offer** * Competitive annual salary * Two unique bonuses: signing bonus at incorporation and retention bonus at contract completion. * Relocation package (if applicable). * Fixed\-term contract ending in June 2026\. * Hybrid role and flexible working hours. * Be part of a fast\-scaling Series B company at the forefront of deep tech. * Equal pay guaranteed. * International exposure in a multicultural, cutting\-edge environment. **As a Quality Control Engineer, you will** * Ensure the reliability, robustness, and performance of our AI\-driven solutions, applications, and products we deliver to clients. * Collaborate with engineers, project managers, customers and product teams to define acceptance criteria. * Evaluate system quality under varied operational conditions, ensuring scalability, latency, and data integrity meet project and client expectations. * Create and standardize quality control and reporting across projects. * Develop and maintain comprehensive test suites tailored to AI systems and ML workflows. * Design and implement automated and manual testing frameworks for LLM\-based applications, including chatbots, RAG systems, APIs, and data pipelines. * Contribute to continuous improvement of QA processes, enforcing best practices in testing, documentation, and validation of ML and LLM pipelines. * Act as a point of contact for quality validation, ensuring that final deliverables meet both technical and functional excellence standards. **Required Qualifications** * 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., reproducibility, model output validation, bias detection). * Familiarity with modern ML and LLM workflows (Python, APIs, cloud ML platforms). * Proficiency in English; Spanish or French is a plus. **HYBRID SETUP: 2 days onsite, 3 days work from home** **LOCATION: Barcelona, Spain** Job Type: Contract Contract length: 6 months Work Location: In person