Getting around on the streets is no problem, everybody in sweden speaks quite good english, even paperwork from bank/government can some times be found in english. Finding a job is possible but you only have 5% of the job market that natives do (95% of all statistics are made up on the spot), and that's assuming you are looking for a position that requires higher education. Finding a basic job such as being a waitress without native language is hard.

I got no specific startup hire sites, but the casual google search should yield the most common job sites, a resourceful person might even join a few linkedin groups and bait.

You can get by with just English, although that is not too common, be prepared to study Swedish, the more you learn Swedish and learn the mentality the easier it will be for you.