I applied online. The process took one week.
There was a technical interview onsite. After acing the interviews, I was told that I lacked experience. They knew my experience coming in, so why did they have me for an onsite interview in that case? In fact, one person was a dev boot camp grad and got a job there right out of finishing, yet I have actual work experience when applying to the job. I think they are afraid of someone who can answer all of their questions correctly. Don't apply here; even if you answer everything correctly, it doesn't mean they are interested in hiring.
The technical interview was onsite. It included a "find a needle in a haystack" problem, an async waterfall using callbacks problem, a calculator system design problem, and a two numbers in an array sum to a particular value problem.
The following metrics were computed from 5 interview experiences for the Sigma Computing Senior Software Engineer role in San Francisco, California.
Sigma Computing's interview process for their Senior Software Engineer roles in San Francisco, California is extremely selective, failing the vast majority of engineers.
Candidates reported having very negative feelings for Sigma Computing's Senior Software Engineer interview process in San Francisco, California.