I work in the tech scene in Amsterdam and know a few places you can look and apply to if you would like to work in a startup specifically.
Rockstart has a platform Rockstart Startup Jobs where all people interested in working in a startup can show their interest. On the platform all startups that have gone through the Rockstart Accelerators have direct access to your cv and motivation when you apply. Check out startupjobs.rockstart.com
You can look through job openings for Rockstart startups directly on the Angel list Rockstart Jobs page
Angel List Amsterdam Startup Jobs
Startus Startup Jobs Amsterdam
Use the Cocoon App to browse through jobs in Amsterdam and beyond, they partner with a lot of startups so you'll see plenty of startup specific jobs here.