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Research Engineer - Language Model Pre-Training

Zyphra - San Francisco, California, United States

Posted Mar 17, 2026

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About this role

Research Engineer - Language Model Pre-Training San Francisco, California, United States Zyphra is an artificial intelligence company based in San Francisco, California. The Role: As a Research Engineer - Language Model Pre-Training , you'll shape our language model roadmap through end-to-end pretraining development. You will work extremely closely with our pretraining team, who will integrate your insights into our next-generation models. You'll Work Across: - Large-scale training runs and model parallelization - Performance optimization of our pretraining stack - Dataset collection, processing, and evaluation - Architecture and methodology research, including optimizer ablations What We're Looking For / Requirements: - Strong engineering aptitude for rapidly implementing reliable and robust systems - Can rapidly learn new fields and are excited to implement new ideas - Excellent communication and collaboration skills, and can work effectively on both research and engineering implementation at scale Qualifications / Additional Skills: - Deep expertise and intuition for solving machine learning problems and training models - Experience with training on large-scale (multi-node) GPU clusters - Deep understanding of model training pipelines - including model/data parallelism, distributed optimizers, etc. - Strong grasp of proper experimental methodology for running rigorous ablations and other hypothesis testing - Understanding of large-scale, highly parallel data processing pipelines - High proficiency with PyTorch and Python. - Strong ability to dive into large pre-existing codebases and rapidly get up to speed - Published machine learning research in well-respected venues is a plus - Postgraduate degree in a scientific subject (Computer Science, EE/EECS, Math, Physics) Why

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