Member of Technical Staff - Mid-training

SpaceXSI is building superintelligence and its supporting model stack. The Member of Technical Staff will develop and scale mid-training data and evaluation approaches to improve model capabilities and readiness for reinforcement learning.

Responsibilities:

• Scale synthetic coding data to trillions of tokens with large-scale docker verification
• Distill the intelligence of flagship models into flash models through synthetic data generation
• Optimize mid-training data mixtures to boost the ceiling for RL
• Engineer long-context data recipes
• Develop robust and diverse evaluation for mid-training checkpoints