Visa Inc. Software Engineer interview experience

Round one was coding in Java, and it covered two problems: one on linked list intersection and another on finding the longest subarray without repeating characters.

After that, I moved into a combined high-level and low-level design interview focused on payments. The task was to design a payment system by thinking through payment states, the different payment methods, how to handle durable execution, and how retries should work. I could feel the interviewers pushing for structure—what happens when things fail, where state lives, and how the system behaves under real-world conditions. The