Is this a good salary: Absolutely yes. You will be earning well above million of software developers.
Is this the highest: No, it's not. If I'm not wrong, Blinkit offers a base of 30 LPA and Rippling offers a base of 36 LPA for freshers. There will be a ton of companies offering more salary for freshers, without involving those working quant field.
But most of them are super inflated. At Walmart you will have a relatively good WLB, interesting work, and more job safety (hopefully). Their finances are really good, at least as of now. They're the only retailer which blew away the earnings expectations by the market analysts last year.