CTRL-labs (https://www.ctrl-labs.com/) works on neural interfaces for AR/VR,
including a cloud platform for scientific research and ML.
Jupyter is a central component of this platform, of course 
We were acquired at the end of last year and are now part of FRL, based in NYC.
My team has an open position to develop this platform, we encourage all qualified candidates to apply.
Please take a look: https://www.facebook.com/careers/jobs/568807057334356
A full-stack developer with Python/Science plus Typescript/Web (eg Jupyter Lab extensions, widgets) would be awesome.
If you or someone you know is interested, please reach out by email.
Note: this is not based on BeakerX the Jupyter platform I used to work on. Totally new company and new project!