Startup Universe
River AI
Your own frontier AI lab in one API: fine-tune open models, sharpen them with reinforcement learning, then serve them on River Cloud or your own GPUs.
20 open roles
Legal Counsel
IT Lead
Design Verification Emulation, Hardware
Operations Lead
People Lead
Software Engineer, GPU Kernels
Software Engineer, Distributed Training
Software Engineer, Inference Systems
Founding Strategic Account Executive
Kernel Engineer (Custom Silicon), Hardware
Member of Program Staff, Data
Open Application, Exceptional Talent
Compiler Engineer, Hardware
Performance Engineer, Hardware
Physical Design Engineer, Hardware
Design Verification Engineer, Hardware
RTL Design Engineer, Hardware
Product Engineer, Personal AI
Research Engineer / Research Scientist
Software Engineer, River API