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Senior LLM Engineer (Deep-Tech AI)

hace 21 días

Bilbao

Senior LLM Engineer (Deep-Tech AI) Location: Basque Country, Spain We are partnering with a well-funded, rapidly scaling deep-tech company operating at the intersection of advanced AI and next-generation computing to find their next Senior LLM Engineer. Backed by strong commercial traction and global enterprise clients, this organization is building highly efficient, production-grade AI systems designed to solve complex, real-world problems across multiple industries. Their team brings together world-class researchers and engineers working on cutting-edge challenges in large-scale model development, optimization, and deployment. This is a rare opportunity to join a highly technical environment where you will directly shape the future of large language models—not just apply them. As a Senior LLM Engineer, you will take ownership of designing, training, and optimizing large-scale language models from the ground up. This is a hands-on, deeply technical role focused on core model development , not just downstream application or prompt engineering. Key Responsibilities Design and train transformer-based models from scratch , including pretraining pipelines at scale Lead or contribute to post-training workflows (SFT, RLHF, DPO, etc.) and model alignment Build and optimize data pipelines for large-scale training (curation, deduplication, sampling strategies) Improve model performance through architecture modifications, training objectives, and efficiency techniques Conduct rigorous evaluation and benchmarking , going beyond standard metrics Optimize training and inference performance (memory, throughput, latency) across GPU/HPC environments Collaborate cross-functionally to integrate models into production systems Mentor junior engineers and contribute to technical best practices Required Experience & Skills Minimum 2+ years of hands-on experience training LLMs or transformer models from scratch (pretraining or equivalent); Machine Learning, Deep Learning, NLP, Computer Vision For the Senior title, a minimum of 5+ years and a wider breadth of experience in building deep learning applications e.g. computer vision, audio Proven experience with end-to-end LLM development , including: Pretraining at scale, fine-tuning (full FT, LoRA, QLoRA, etc.), and model evaluation and iteration Strong theoretical understanding of transformers, optimization, and deep learning fundamentals Expertise in Python and modern ML frameworks (e.g., PyTorch, Hugging Face ecosystem) Experience with distributed training (FSDP, DeepSpeed, Megatron, etc.) Solid understanding of GPU architectures and performance optimization techniques Experience working with large datasets and training pipelines at scale Familiarity with inference optimization tools (e.g., vLLM, TensorRT-LLM) Strong problem-solving and debugging capabilities in complex training systems Why Apply? Work on true LLM innovation , not just downstream applications Influence the design of next-generation AI systems at scale Join a highly technical, research-driven environment with real-world impact Competitive compensation, flexible working, and strong growth trajectory Recruiter’s Note We are specifically targeting engineers who have built models, not just used them . If you’ve led or significantly contributed to training pipelines, tackled scaling challenges, or improved model performance at the architecture or systems level - we want to hear from you. Candidates who only have experience working on prompt engineering, API-based LLM usage, or light fine-tuning of existing models cannot be considered. If this role is of any interest please apply directly on LinkedIn or send a copy of your CV, referencing the title and location, and with a short intro to . By applying to this role you understand that we may collect your personal data and store and process it on our systems. For more information please see our Privacy Notice ( )

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