I don't know where to look since I never had to. Personally I would stay away from the financial industry. Most jobs include politics, frequent restructuring, mediocre tech, etc... the ususal. (They have their perks too, see above answer).

There are some companies that came out of ETH/UZH like Scandid or Teralytics. Lately there have been quite a few fintech and blockchain startups but you never know how long they're around for. And then there is Google, of course. But generally I have to say that one of the reasons I came to London is because there is A LOT more tech here. The majority of the software engineering jobs in Zurich are in some way or another connected to the financial industry.