Member of Technical Staff - Post-Training

Join Reflection's mission to build open superintelligence and drive research and engineering initiatives that push the frontier of post-training. As a Member of Technical Staff, you'll build systems that transform powerful pre-trained models into aligned and general agents, and collaborate across teams to deliver step-function gains in model capability.

Requirements

• Deep understanding of machine learning fundamentals and practical experience with large-scale LLM training
• Strong engineering skills, comfortable diving into complex ML codebases and distributed systems
• Experience improving model behavior through data, reward modeling, or RL techniques
• Evidence of owning ambitious research or engineering agendas that led to measurable model improvements
• Thrive in a fast-paced, high-agency startup environment
• Able to work fluidly across research and infra boundaries
• Strong communication capabilities and comfort working collaboratively
• Passionate about advancing the frontier of intelligence

Benefits

• Top-tier compensation
• Comprehensive medical, dental, vision, life, and disability insurance
• Fully paid parental leave for all new parents
• Financial support for family planning
• Paid time off when you need it
• Relocation support