Went through the eBay full loop earlier this month. Wanted to specifically write up the behavioral portion because I had a hard time finding good info on this before my interviews.
eBay doesn't have the same public-facing 'leadership principles' branding that Amazon does, but they do have defined values. The interviewers explicitly mentioned themes around customer obsession, innovation, and impact. In practice that translated into these actual questions: Tell me about a time you had to make a technical decision with incomplete information. How did you know when you had enough? Describe a situation where you pushed back on a stakeholder or manager. What was the outcome? Give me an example of a project that failed. What did you learn and what would you change? Tell me about a time you improved a process that wasn't in your job description. How have you handled working with a teammate who wasn't pulling their weight?
They use a STAR format implicitly. They'll follow up if you're being vague. The follow-ups are where it gets real: "What specifically did YOU do, not the team?" came up in every single round.
A couple of notes from my experience:
The behavioral rounds are often embedded in other interviews, not standalone. My system design round had 15 minutes of behavioral at the end. So don't assume you're done when the technical part wraps up.
The 'failure' question is important at eBay. I saw posts elsewhere saying to keep it light but that's wrong. They want genuine self-reflection. I gave a real example of a migration project that went sideways and that went over well.
They also asked about cross-functional collaboration specifically. eBay has a lot of business units and apparently silos are a known problem internally. They want people who can navigate that.
For prep: write out 6-8 real stories you can adapt. Don't memorize scripts. And be ready to defend your decisions when they probe.