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I think everyone's going to have different opinions here.

For me, I love JavaScript and think that PayPal's gotten a lot of benefit by adopting Node.js for many reasons. One of these being now there are lots of engineers at PayPal who know JavaScript super well and can contribute in great ways on both the client and server. I don't know whether other teams are thinking about using Go, but my team's pretty solid on Node :)

I agree with Kent. Even within Paypal, you may hear differing opinions from developers. Today node.js reigns the front tier. But I have heard murmurs, GO is being experimented for some midtier services.

Thanks, no wonder why Ryan Dahl and TJ both switched to GO. But again "Change is the only Constant". Rest we all love JS, but also should embrace other technologies... :D

For me, I'm head-over-heels in love with JavaScript and all that it stands for. Since PayPal really made an effort to push forward the adoption of Node.js, we have a lot of solid full-stack engineers that can write it back to front.

I think one recurring challenge we have though is migrating our legacy systems over from Java/C/C++ over to JavaScript and Node; we have to do a lot of work to ensure that legacy migrations go smoothly and without a hitch.