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← Reflection AI

Member of Technical Staff - Pre-Training

Reflection AI · San Francisco, CA · London · New York, NY

CHECKED 18H AGO

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At a glance

Highlights

  • Research scaling laws and data efficiency for large language models.
  • Build open models that let anyone control and customize intelligence.
  • Optimize training infrastructure for efficient large-scale scaling.

What they offer

  • Top-tier salary and equity structured to recognize talent globally
  • Stock options for all contributors
  • Comprehensive medical, dental, vision, life plus wellness allowance
  • Lunch and dinner provided in the office daily
  • 22 weeks paid parental leave for all new parents
  • Unlimited PTO in the U.S. and 30 days in the U.K.
  • Visa sponsorship and long-term immigration support
  • Regular off-sites, happy hours, and team celebrations

Ideal candidate

Research-driven builder with graduate background who thrives in fast-paced startups, balancing scientific curiosity with pragmatic engineering to advance open frontier intelligence.

Requirements

  • Graduate degree (MS or PhD) in Computer Science, Machine Learning, or related discipline.
  • Solid software engineering capabilities with experience building large-scale systems.
  • Experience with large-scale ETL workflows and training data preparation.
  • Deep understanding of large-scale ML, especially as it relates to language models, distributed training, and scaling.
  • Proficient in Python and deep learning frameworks (PyTorch preferred).
  • Navigate trade-offs between research objectives and practical engineering realities.
  • Thrive in a fast-paced, high-agency startup environment with bias toward action.
  • Strong communication capabilities and comfort working collaboratively.
  • Passionate about advancing the frontier of intelligence.
visa sponsorship
We sponsor visas to help exceptional talent join our team and support long-term immigration pathways where applicable.

Lab profile

About Reflection AI

Research lab making intelligence open and accessible for everyone to use, customize, and build on.

What they build

  • Open foundation models
  • Aligned general agents
  • Enterprise AI deployments

Known for

  • Frontier model pre-training
  • Post-training and alignment
  • Distributed training infrastructure
  • Secure cloud platform foundations
More about Reflection AI →
Apply on the lab’s site ↗