20 publicaciones de empleo destacadas en principal / staff software engineer backend, mlops and cloud infrastructure (¡Están contratando!)

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Senior / Mid LLM Engineer – Applied AI y Model Optimization

Mystery Project
Donostia-San Sebastián, Guipúzcoa provincia

Solicitud rápida

Detalles del empleo

Jornada completa

Cualificaciones

Derecho
Doctorado
Informática
Inglés
Investigación
Máster
Docker
Deep learning
Escalabilidad
Cloud
Inteligencia artificial
Python

Descripción completa del empleo

Senior / Mid LLM Engineer – Applied AI & Model Optimization
San Sebastián (Spain) | Hybrid

About the opportunity
We are partnering with a fast-scaling deep-tech company operating at the intersection of advanced AI, large language models, and next-generation computational techniques.

The team focuses on solving real-world, high-impact problems by building and optimizing AI systems used by global enterprises across industries such as finance, energy, and industrial operations.

This is not a pure research role — it’s applied AI at scale, where your work directly translates into production-ready solutions.

Role mission
As an LLM Engineer, you will play a key role in designing, improving, and deploying large language models, with a strong focus on efficiency, scalability, and real-world applicability.

You’ll work on challenging problems such as model compression, performance optimization, and integration into complex systems, collaborating with highly technical teams in a fast-paced environment.

What you’ll be doing
Design and improve LLM architectures and optimization techniques for real-world use cases.
Fine-tune and evaluate transformer-based models to enhance performance and efficiency.
Work on model compression and acceleration strategies.
Run benchmarks, analyze model behavior, and identify performance bottlenecks.
Contribute to the deployment of AI models in production environments.
Collaborate with cross-functional teams (engineering, data, product).
Mentor junior engineers and contribute to technical decision-making.
Stay up to date with the latest advancements in LLMs and applied AI.

What we’re looking for
Background in Computer Science, AI, Data Science or related field (Master’s or PhD preferred).
Hands-on experience working with:
Large Language Models / Transformers
PyTorch and modern ML frameworks
Hugging Face ecosystem or similar
Strong understanding of deep learning fundamentals (training & inference).
Solid programming skills in Python.
Experience working with GPUs and performance optimization.
Familiarity with deploying models in cloud environments.
Strong problem-solving mindset and ability to work in complex systems.
Fluent English.

Nice to have
Experience with:
Model compression / inference optimization
RAG systems
Large-scale training or HPC environments
MLOps / production pipelines
Docker / cloud infrastructure
Research background or publications in AI
Experience working on applied AI projects in industry

What makes this role interesting
Work on cutting-edge AI challenges, not generic ML tasks
Strong focus on real-world impact and production systems
Highly technical environment with top-tier engineers
Opportunity to influence how LLMs are built and optimized
Fast growth, high ownership, and career progression

The company will fully support you with all administrative, legal, and logistical processes to ensure a smooth relocation to San Sebastián.
Initial housing support will be provided, including temporary accommodation and assistance with your home search.
A unique opportunity to settle in one of the most desirable cities to live in Spain — offering an exceptional quality of life, with beaches, world-class gastronomy, surf, and a vibrant cultural scene.

Solicitud rápida

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