I went through 5 rounds of interview with circle. First round with a techinical hirinig manager, knowledgeable and professional. Asked all the releavant questions about the project experience on the resume. Second round was a HR screening, with a lot of behavior questions. Then going through a 3-hour long interview pipeline. One is pythong pair programming on code signal, one round is docker containerization hands-on lab. Third round is a system design, standard system design interview. I did not make it to the final round which should be a Behavior questions round with one of the VPs. Overall I think all the interviewers were very kind and professional. It was a good expereince with well-organzied materials.

Technical HR: Questions about your project and tech stacks on your resume. HR: Behavior questions, what's the biggest challenges and accomplishments for your past work experience, why Circle etc. 3 Hour technical interview pipeline: Python pair programming: With a received JSON response string curled from a pre-defined URL end point, extract the useful information from it, making a unit change and add some string manipulation to the results, do a sorting and some math around the extracted numbers and return them. Hint: It's a JSON result about crypto currencies. Docker hands-on interview: Given pre-defined web server files written in Go, build images and containers and to make the web server to connect and work with Postgres database successfully.

Hint: You need to figure out how to configure it properly to make the server talk to the Postgres System design: Design a report generation system, with its own PDF generation functionality, anyone can download it. Hint: Needs to be scalable, think about AWS related technologies and how to apply those into your design.