Whether or not a company is a "tech" company is kind of a muddled question, but taking even a brief glance at https://airbnb.io/ (their engineering blog) makes it clear that AirBnB does some pretty serious engineering.
For example, their post about their work in search ranking is quite interesting [1].
For example, their post about their work in search ranking is quite interesting [1].
[1]: https://medium.com/airbnb-engineering/machine-learning-power...