Stripe Staff+ Software Engineer Interview Experience — HackerRank, Code Review and a Past-Project Deep Dive, Then an Offer

Stripe Staff+ Engineer

I ended up with an offer from Stripe worth roughly $1M in total comp.

Background

I come from big tech, with time spent on ML infrastructure, payments and other large-scale systems.

Preparation

What helped:

• An online system design course:

1. System design practice. I tried to solve each problem by myself before opening any reference answer, and when my design had holes compared to the reference, I went back and redid it, sometimes more than once.
2. A mock interview for the technical presentation round. The feedback was good and it let me reshape my story.

• Other things:
• I researched the company's culture in detail, along with how their planning process works.
• I did mock interviews with former colleagues and managers, which got my leadership stories into shape.

What did not help:

• My leadership stories were too long and too generic. I got a first draft out of ChatGPT and an online course, then rewrote it many times. Looking back, I should have cut the first versions in half and made them far more specific.
• My early stories hid the point. I should have opened with the central conflict instead.

The process and the questions

Technical:

• HackerRank coding: one problem in several parts, each harder than the last, built around a fintech scenario. It felt like real work, not a LeetCode-style puzzle.
• Code review: they handed me an actual PR to look over, and I had to judge how I would phrase feedback for engineers at different levels.
• System design: several rounds, and the questions looked a lot like the ones in the course I had practiced with.
• Architecture deep-dive: a 15-20 minute presentation about a technical project I had worked on, followed by questions such as what I would do differently.

Behavioral:

• Questions along the lines of "tell me about a time you made a hard technical call without having all the information", the kind you can easily find online.
• Leadership scenarios about getting stakeholders on the same page.
• Stories about mentoring people and growing my technical influence.

What I would tell other candidates

1. Use mock interview services. Hearing real feedback from someone more experienced is worth much more. Before that, though, rework your stories a lot with Claude or ChatGPT.
2. Open with business impact: the scope and the money at stake come before the technical details.
3. Keep each story under 5 minutes. Talk about the specific decisions you made under pressure and skip generic leadership talk.
4. Learn the company's culture. They care about clarity and about influencing people without having authority over them.
5. Do lots of system design rounds on your own, use the feedback you get, and then repeat them.