Machine Learning Engineer
3 days ago
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Machine Learning Engineer
Company Description: Cosine.sh is pioneering AI for software engineering, building advanced open-source-based models that empower developers with intelligent, real-world coding capabilities.
sh as a Machine Learning Engineer and lead large-scale training of Lumen Enterprise models—our flagship software engineering LLMs. You will drive state-of-the-art performance through supervised fine-tuning and reinforcement learning, operating close to the metal with PyTorch, distributed systems, and long-context architectures. Operate at real scale: modern open-source models, long-context training, MoE architectures, and multi-node GPU clusters.
A true full-stack ML engineering role combining PyTorch, distributed systems, data pipelines, RL design, and MLOps.
Transform open-source base models into high-performance Lumen Enterprise SWE agents using supervised fine-tuning and RL.
Design and execute large-scale training experiments on multi-node GPU clusters, including long-context and MoE training.
Build and refine large-scale RL loops where models write code, run tools/tests, and receive reward signals to improve performance.
3–5+ years of experience training deep learning models in production environments.
~ distributed for multi-GPU and multi-node training.
~ Experience training large sequence models or LLMs (70B+ parameters), with practical understanding of scaling challenges.
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