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Research Engineer - Language Model Pre-Training

Zyphra · San Francisco

Extracted from the posting

Base
Not stated
Remote
On-site
Visa
Relocation and immigration support on a case-by-case basis
Stack
PyTorch, Python

Owns end-to-end language model pretraining development at Zyphra, covering large-scale training runs, parallelization, pretraining stack performance, and dataset processing. Works closely with the pretraining team to integrate insights into next-generation models. Stack includes PyTorch, Python, and multi-node GPU clusters.

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 Work at Zyphra:

  • Our research methodology is to make grounded, methodical steps toward ambitious goals. Both deep research and engineering excellence are equally valued
  • We strongly value new and crazy ideas and are very willing to bet big on new ideas
  • We move as quickly as we can; we aim to minimize the bar to impact as low as possible
  • We all enjoy what we do and love discussing AI


Benefits and Perks:

  • Comprehensive medical, dental, vision, and FSA plans
  • Competitive compensation and 401(k) plan
  • Relocation and immigration support on a case-by-case basis
  • In-office snacks and meals provided
  • Unlimited PTO and company holidays
  • In-person team in San Francisco with a collaborative, high-energy environment


Technologies

PyTorchPython
Zyphra
Zyphra
Website

Job details

TypeFull-time
Work ModeOn-site
LevelMid Level
Location🇺🇸San Francisco, CA
PostedNov 06, 2026
Apply Now

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