ReflectionAI
Member of Technical Staff - Post-Training
San Francisco · Staff+
H1B sponsorship availableDetected 21 days ago
AlgorithmsMachine LearningLLMsResearchCommunication
About the role
- Contribute to shaping our understanding of how large models learn to reason, follow instructions, and improve through reinforcement learning.
Responsibilities
- 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.
- Build systems that transform powerful pre-trained models into aligned and general agents.
- Drive research and engineering initiatives that push the frontier of post-training, from data curation to large-scale optimization.
- Collaborate across pre-training and post-training teams to deliver step-function gains in model capability.
- 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.
Requirements
- Experience improving model behavior through data, reward modeling, or RL techniques.
Skills
- Strong engineering skills, comfortable diving into complex ML codebases and distributed systems.
Compensation
- Salary and equity structured to recognize and retain our talent globally.
- Health & wellness: Comprehensive medical, dental, vision, and life, with an annual wellness allowance.
Benefits
- 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.
Company info
- make intelligence open and accessible to all.
Visa & Work Authorization
- We sponsor visas to help exceptional talent join our team and support long-term immigration pathways where applicable.
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This listing is sourced directly from ReflectionAI's careers page and normalized into a canonical job model.