I've said this before in another relocation thread: I'm an expat working in Paris in tech. Sure, everybody at work is able to speak broken English, but most don't enjoy it. Of other expats I know, the ones who went to the effort of learning French, even just the basics (and are working on improving it), are happy here. The ones who came without intending to learn French are miserable. Many French people aren't exactly welcoming to people who don't show effort. If you work in a startup, your ten French colleagues won't happily switch to English during lunch breaks just so you can follow the conversation. (As opposed to Scandinavia, say.)

You're welcome to come, it's great here. But don't come without wanting to learn French. You'll be unhappy.