I've worked at startups, Microsoft (Ballmer days), Google, eBay, and back at Microsoft (Satya days). eBay was nice but not great infrastructure. Google had great infrastructure but was like a headless chicken, and after a while having that much autonomy and lack of leadership and vision gets old. Microsoft is slower, more staid, more hierarchical and incremental (and the focus on enterprise customers means that won't change), but has good leadership who show genuine care for the workforce, and knows how to execute, day in and day out. And the scope of what Microsoft does means you should never be bored. I'd recommend eBay and Google as good places to work, but Microsoft is a great place to work.
