ReflectionAI

Member of Technical Staff - Pre-Training

San Francisco · Staff+

H1B sponsorship availableDetected 287 days ago

PythonAlgorithmsMachine LearningDeep LearningPyTorchData EngineeringLLMsResearchCommunication

About the role

Reflection is a research lab making intelligence open and accessible for everyone to use, customize, and build on. We build open models that let anyone control their intelligence and help shape the future of AI. Our mission: make intelligence open and accessible to all.
- Research and build solutions across algorithms, scaling laws, data processing, optimizers, and model architecture.

Reflection is a research lab making intelligence open and accessible for everyone to use, customize, and build on.
We build open models that let anyone control their intelligence and help shape the future of AI.
Research and build solutions across algorithms, scaling laws, data processing, optimizers, and model architecture.
Design and run scientific experiments to advance our understanding of scaling large language models and data efficiency.
Contribute across the entire stack, from low-level optimizations to high-level model design.
Sponsorship support: We sponsor visas to help exceptional talent join our team and support long-term immigration pathways where applicable.
Team building: We have regular off-sites, happy hours, and team celebrations.
Joining Reflection means building from the ground up as part of a talent-dense team.

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.
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.

Salary and equity structured to recognize and retain our talent globally.
Health & wellness: Comprehensive medical, dental, vision, and life, with an annual wellness allowance.

Top-tier compensation: Salary and equity structured to recognize and retain our talent globally.
Stock options: Everyone who joins and contributes to Reflection's success gets to share in the upside through stock options.
Health & wellness: Comprehensive medical, dental, vision, and life, with an annual wellness allowance.
Life & family: 22 weeks paid parental leave for all new birthing and non-birthing parents, including adoptive and surrogate journeys.
Vacation days: Unlimited paid time off in the U.S. and 30 days in the U.K.

We sponsor visas to help exceptional talent join our team and support long-term immigration pathways where applicable.

This listing is sourced directly from ReflectionAI's careers page and normalized into a canonical job model.