Pros
Remote work, like any company your manager might be a gem (mine was) and do their best to shield you and commiserate about corporate decision making. And like any decently-well-paying company you will work with some great people for a short time, but...
Cons
The complete and utter absence of vision, goals, and accountability at the highest levels of the company, which drives away pretty much all of the talented and empathetic employees. Dead sea effect, writ very, very large. As an engineer, you will be joining their information technology division, and generally perceived not as the future of the company, but as a service arm of an insurance conglomerate. Get ready for the worst of it: waterfall development, sales-and-marketing driven development (there literally is no such thing as "product" here), and a capricious, poorly-communicated whirlwind of management priorities that make you realize this company would not exist if not for the fact that United Healthcare forces folks to use it. Your job will probably be outsourced in a few years, because the overall quality level of the product is so low, and the technology is so ancient, and the freedom to innovate so stifled, there's almost zero benefit to paying people who are talented and actually care.