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Research Engineer – Large Language Models (Foundational Model from Scratch)

Bay Area, CA

A deep-tech startup on a mission to build a foundational AI model from scratch. Our team combines world-class research, cutting-edge engineering, and a bold vision: to create AI systems that are causal, interpretable, and scalable. Backed by top-tier investors and pioneering talent in AI, we're tackling some of the hardest problems in modern machine learning.

We are looking for a Research Engineer who has hands-on experience contributing to large language models (LLMs) — whether that's pretraining, post-training, or fine-tuning. You will join our team building a foundational model from scratch, shaping its architecture, training pipelines, and capabilities. This is a rare opportunity to work at the forefront of AI research and engineering in the Bay Area.

What You'll Do:

• Lead and contribute to core development of a foundational language model, including model architecture, training strategies, and evaluation.
• Implement, optimize, and scale pretraining, fine-tuning, and post-training pipelines for large-scale models.
• Collaborate closely with research scientists and ML engineers to push the boundaries of LLM capabilities.
• Conduct experiments to improve model performance, generalization, and safety.
• Build reusable infrastructure and tools for training, evaluation, and deployment of next-generation LLMs.

What We're Looking For:

• Strong hands-on experience with large language models, ideally with contributions to pretraining, fine-tuning, or RLHF.
• Expertise in PyTorch or JAX, distributed training, and large-scale ML pipelines.
• Solid understanding of modern LLM architectures and training techniques.
• Ability to translate research insights into scalable engineering solutions.
• Passion for building models from the ground up and contributing to a high-performing, collaborative team.

Seniority level

• Mid-Senior level

Employment type

• Full-time

Job function

• Research, Engineering, and Information Technology

Industries

• Research Services and Space Research and Technology