I applied online. The process took 3 months.

I applied online, had a brief call with the CTO, and was sent a take-home exercise in Go. After that, there was a 30-minute call to review my code, and finally a face-to-face interview in 3 phases (systems design, technical questions, and HR/cultural fit interview), which took 3 hours.

The process was very slow, with about 3 months between my initial application and the face-to-face. I had to send a couple of follow-up emails after each stage to get the next one booked in. I got a rejection letter about a week after the face-to-face, with a very brief and generic piece of feedback.

How is a hashmap implemented?