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From the employer's careers site First seen 11 Nov 2026

Research Scientist - Reinforcement Learning

SpaceXSI Palo Alto On-site senior full-time

Salary

$160,000 - $250,000 USD per year

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Description

We are seeking a Research Scientist to join our team, focusing on reinforcement learning research and development.

The successful candidate will design and run rigorous experiments to improve model capability, develop data recipes, and define evaluation metrics.

Responsibilities:

  • Design and run experiments to measure gains in model capability
  • Improve data quality and recipes through deduplication and mixture experiments
  • Develop evaluation metrics and grader design
  • Advance training science, including architecture and scaling experiments
  • Build evaluations and targeted tasks to expose model weaknesses
  • Collaborate with engineers to scale experiments

Basic Qualifications:

  • Experience writing production-quality code in Python, PyTorch, JAX, Rust, or C++

Preferred Skills and Experience:

  • Experience with reinforcement learning algorithms and language models
  • Strong background in machine learning fundamentals
  • Excellent programming skills in Python and PyTorch or JAX
  • Experience with distributed training at scale
  • Track record of original work in machine learning
  • MS or PhD in Computer Science, Machine Learning, or a related field

Additional Requirements:

  • Must be able to work onsite in Palo Alto

Compensation and Benefits:

  • Annual salary: $160,000 - $250,000 USD
  • Comprehensive benefits package, including equity, medical, vision, and dental coverage, 401(k) retirement plan, and other perks

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Skills

Nice to have

Ready to apply?

You apply with the employer directly. Their original posting is here: https://cursor.com/careers/model-engineer

Apply on SpaceXSI