I worked at Sonim Technologies full-time (More than a year)
The employee culture is great, truly everything you envision when you picture a typical tech startup: ping pong table, open floor plan, young staff, etc.
Sonim show that they care for their employees, not only with their generous benefits, but also by fostering a sense of family within the office.
The company is a great place to start, if you don't mind a fast paced dynamic environment!
Lack of planning ahead, a lot of projects are done on the fly. There's a culture of "fire-fighting" where issues aren't dealt with until they become an immediate problem.
Difficult to balance work/social life if you don't make your colleagues your main social circle.
Advice to Management
More planning ahead, the employees would benefit from a certain level of additional predictability. Other than that the company seems to be going in the right direction!
I applied online. I interviewed at Sonim Technologies (San Mateo, CA) in October 2016.
I received a call and was asked to speak a little bit about my self. It was a short, informal call and I was asked to come in for an interview in the following week. The interview was done by three people, separately. Took about two hours total.