**Location:** Barcelona \& Zaragoza, Spain **Work Setup:** Hybrid (3 days remote, 2 days onsite) **Contract Type:** Fixed\-term (until June 2026\) **About the Role** We are looking for a talented **Machine Learning Engineer** to join a fast\-scaling **Series B deep tech company** at the forefront of **AI, LLMs, and quantum\-inspired technologies**. You will work on cutting\-edge projects involving **Large Language Models, AI agents, RAG systems, and computer vision**, collaborating with an international and highly skilled team. **What We Offer** * Competitive annual salary starting from **€45,000**, based on experience and qualifications * **Signing bonus** upon incorporation * **Retention bonus** at contract completion * **Relocation package** (if applicable) * Hybrid work setup with flexible working hours * Equal pay guaranteed * International exposure in a multicultural, cutting\-edge environment **Key Responsibilities** * Design and develop **quantum\-inspired techniques** to compress and optimize Large Language Models * Conduct rigorous **model evaluations, benchmarking, fine\-tuning, and optimization** for accuracy, robustness, and efficiency * Build **LLM\-based applications**, including **RAG systems and AI agents** * Assess model strengths and weaknesses and propose innovative improvements * Act as a **domain expert in LLMs**, identifying opportunities for AI\-driven innovation * Design, train, and deliver **custom deep learning models** for clients * Work across diverse AI domains, including **computer vision** * Maintain thorough documentation of experiments, models, and development processes * Mentor junior team members and contribute to a culture of continuous learning * Participate in **code reviews** and provide constructive feedback * Stay up to date with the latest trends and advancements in AI and LLM technologies **Qualifications** * Bachelor’s, Master’s, or PhD in **Artificial Intelligence, Computer Science, Data Science**, or related fields * **2\+ years** of hands\-on experience designing, training, or fine\-tuning deep learning models * Strong experience with **transformer models** (LLMs and/or computer vision) * Proficiency with **Python** and libraries such as **PyTorch and HuggingFace (Transformers, Accelerate, Datasets)** * Solid mathematical and theoretical understanding of deep learning algorithms (training \& inference) * Experience with **cloud platforms** (preferably AWS), **Docker**, and deploying AI solutions * Strong problem\-solving, debugging, and performance optimization skills * Excellent written and verbal **English communication skills** * Ability to collaborate effectively in a fast\-paced team environment * Research publications in deep learning or related fields are a **plus** **Preferred Background** * Experience working in **Spain** * Background in **cybersecurity\-related AI projects** * 3–4 years of professional experience as an AI / Machine Learning Engineer Job Type: Contract Contract length: 6 months Pay: 45,000\.00€ per year Ability to commute/relocate: * Barcelona, Barcelona provincia: Reliably commute or willing to relocate with an employer\-provided relocation package (Preferred) Experience: * AI/ Machine Learning Engineer: 3 years (Preferred) Work Location: In person