River AI jobs, careers, and hiring context

Explore River AI careers: 19 open roles hiring now. Find jobs at River AI with direct links to apply. Funding stage: Series A. Headcount: 1-10. River AI is a Palo Alto–based AI startup founded by former xAI co-founder Igor Babuschkin, building a full-stack platform for custom, open-weight model development. Its API lets developers fine-tune open models with reinforcement learning and LoRA, completing complex RL training runs in 15–20 minutes without dedicated infrastructure. The company positions itself as an alternative to prompt engineering against closed-source incumbents.

This page summarizes open roles, company profile signals, and official application paths so candidates can quickly evaluate fit before applying. Use the role list below to identify team focus, review location patterns, and jump to source listings. For broader comparison across the market, continue to the full company directory and jobs explorer.