Walmart

I cannot speak for past behavior of the company, nor for the non-web part. But on the technology side, I found myself being pleasantly surprised by what I found in the company versus the assumptions Walmart has out there in the general public.

• Modern technology choices
• Open environment
• Open source heavily used and contributions encouraged
• Large scale to play with (data, visitors, product count, problem space, etc.)
• Willingness to invest in innovative solutions and experimentation (depends on team, I suppose)
• Company is showing more and more progressive and socially responsible behaviors on the political front (green energy focus is one highlight)
• "Doing the right thing" is actually deeply ingrained into Walmart's DNA.

Big company issues: many departments with legacy solutions and long-standing problems.

If you are willing to "bring your own leadership," you'll have a good time. Otherwise, it depends on which group you end up in.