Member of Technical Staff - Post-Training

Member of Technical Staff – Post‑Training

Reflection AI is building open superintelligence and making it accessible to all. We’re developing open‑weight models for individuals, agents, enterprises, and even nation states. Our team of AI researchers and company builders come from Deep Mind, OpenAI, Google Brain, Meta, Character.

AI, Anthropic and beyond.

• Build systems that transform pre‑trained models into aligned and general agents.
• Drive research and engineering initiatives pushing the frontier of post‑training, from data curation to large‑scale optimization.
• Develop data‑generation pipelines, reward models, reinforcement‑learning algorithms, and inference‑time scaling techniques.
• Collaborate across pre‑training and post‑training teams to deliver step‑function gains in model capability.
• Contribute to shaping our understanding of how large models learn to reason, follow instructions, and improve through reinforcement learning.

• 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.
• Thrives in a fast‑paced, high‑agency startup environment; bias toward action and clear execution.
• Able to work fluidly across research and infra boundaries.
• Strong communication capabilities and comfort working collaboratively.
• Passionate about advancing the frontier of intelligence.

• Top‑tier compensation: salary and equity structured to recognize and retain the best talent globally.
• Health & wellness: comprehensive medical, dental, vision, life, and disability insurance.
• Life & family: fully paid parental leave for all new parents, including adoptive and surrogate journeys. Financial support for family planning.
• Benefits & balance: paid time off when needed, relocation support, and perks that optimize your time.
• Opportunities to connect with teammates: lunch and dinner are provided daily. We have regular off‑sites and team celebrations.

Entry level

Full‑time

Engineering and Information Technology

Industries:
Software Development