Linkedin. There are some options that you can enable that will put you on the recruiting radar, and depending on your profile, you should see an uptick in linkedin messages from recruiters.
See profile of senior developers in big companies (that's easy to find through Linkedin search) and copy the layout of their profile / the way they describe their job experience.<p>Have lot's of keywords that are relevant to the job you're looking for (and experience on it)<p>I get at the very least 1 recruiter contacting me per week... am not looking and don't have the "open for contact" option enabled in Linkedin
Uploading your CV to a job board is still a good way to show you’re active, recruiters (in house and agency) will get daily alerts to new CVs matching keywords they’ve preset.