The 1:1 phone interview and HackerRank questions are the same. You can find various examples here of what they ask, so I won't focus on that. You also get to bring your own laptop and use your own environment, which is extremely helpful because you are most likely very comfortable coding on it. I used Python 3, but for the bug squashing/request question, they had code for Python 2. It's 2019, so Python 3 should be a standard, but apparently not.

I will focus on the onsite interview, which had four phases:

1. Solve a question in a language of your choice.
2. Bug squashing session.
3. One-on-one with an engineering manager.
4. Using APIs to send requests and work with JSON.

Phase 1 was fairly easy. There were two developers who asked a question and you coded it out. I started working on the whiteboard, but they said they wanted to see me code it out. I solved it with a few minutes to spare.

Phase 2 was actually very difficult. I spent 20 minutes trying to even download from GitHub and get everything set up because my laptop had no internet connection. They brought me a MacBook, which I was not familiar with at all. I definitely recommend practicing with a MacBook (using the terminal for downloading, unzipping files, and moving files) if you don't know how.

In Phase 3, the engineering manager seemed very uninterested in me. I swear he was doing work or talking to other people, as his focus would switch to his laptop quite often.

Phase 4 was fun, but my inexperience with requests and JSON definitely hindered me on this one.

We had a lunch session afterward, and I was denied about a week later. They didn't even call for the denial; they just sent an email. Very professional, thanks Stripe!

I definitely recommend looking at the Glassdoor questions for help, because they really like using the same questions for all of their interviews.