Member of Technical Staff - Pre-Training
reflection aiMillbrae (CA)
Member of Technical Staff - Pre-Training
Posted 11 days ago
reflection aiMillbrae (CA)
SENIORITY
Senior
About the role
About the Role:
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.
Implement state-of-the-art methods from the deep learning literature.
Lead small research projects independently while collaborating on larger initiatives.
Optimize the training infrastructure for efficient scaling.
Contribute across the entire stack, from low-level optimizations to high-level model design.
About You:
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.
What We Offer:
We believe that to make intelligence open and accessible to all, you need to start at the foundation. Joining Reflection means building from the ground up as part of a talent-dense team. You will help define our future as a company, and help define the future of open foundational models.
We want you to do the most impactful work of your career with the confidence that you and the people you care about most are supported.
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.
Meals: Lunch and dinner are provided in the office daily.
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.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.
Export Control Notice: This position may require access to technology or source code subject to the U.S. Export Administration Regulations. Any offer of employment for this role may be conditioned on the Company's ability to provide the candidate with access to such technology or source code in compliance with applicable U.S. export control laws, which may require the Company to seek government authorization.
Before you apply
Applying takes about a minute. These four things decide how fast it moves after that.
Your profile is current
It's what we read first. Occupations, seniority and locations matter more than a long history.
Two examples you can talk through
Not a portfolio — just two pieces of work where you can explain the decisions and what you'd change.
A number in mind
What you're on now and what would make you move. We negotiate better when we know both.
Your notice period
Employers plan around it, and it's the question that stalls offers most often.
Once you apply, someone reads it and calls you before anything reaches the employer — usually within two working days.