I'm in the Consumer Payments team; our biggest project recently was the Amazon Prime Rewards Card ( https://www.amazon.com/visa ), but we also handle things like the store card, installment payments, and so on. We use technologies like AWS, web development, machine learning, and microservices, at scales up to tens of thousands of transactions per second. We also have our own functional programming framework for batch processing (yeah; sometimes you still have to do that) up to millions of records.
We're looking for SDEs, SDETs, PMs, and TPMs. Let me know if you're interested, and I'll connect you with our team's recruiter.