This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior ML Engineer (Token Factory) based in Spain.
This role offers the opportunity to work at the forefront of large-scale AI infrastructure and machine learning systems.
You will help build inference and fine-tuning technologies for foundation models spanning language, vision, audio, and multimodal architectures.
Your work will focus on improving model quality, training efficiency, inference performance, and hardware utilization at massive scale.
You will tackle technically challenging problems involving distributed training, low-precision computation, optimization, and reinforcement learning.
Working primarily with Python and JAX, you will turn advanced research ideas into reliable, production-ready systems.
The role combines deep technical ownership with opportunities to influence engineering practices and contribute to the evolution of AI platforms.
You will collaborate with highly experienced engineers and researchers in a fast-moving,



international environment where your work can have significant impact.
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Accountabilities
Develop and improve advanced fine-tuning methodologies, including LoRA-based and full-parameter approaches, for cutting-edge foundation models.
Optimize model quality and training efficiency across large-scale machine learning workloads.
Identify and address bottlenecks in large language model inference to improve production performance and resource efficiency.
Build training and evaluation pipelines using JAX for techniques such as speculative decoding and advanced inference optimization.
Experiment with different model architectures, including dense and mixture-of-experts models as well as autoregressive and parallel approaches.
Develop and evaluate scaling laws to inform model development, performance optimization, and resource allocation.
Investigate low-precision training and inference approaches, includin

📌 Senior ML Engineer (España)
🏢 Jobgether
📍 España