Companies usually will search first and approach people they are interested in before a role becomes public.
There are many ways to be found on line.
In New Zealand, LinkedIn now has a good number of users and seems to have become the default. I strongly recommend having a profile on LinkedIn. Many companies and recruiters search through LinkedIn when they are looking for particular skills.
You must make sure your profile is up to date, complete, appealing and well written.
Make it easy for people to contact you and find your details
Use plenty of key works i.e what would people search for you under. List your skills that you want to be found on somewhere in your profile.
Link to people who work in your sector, link also to people in companies you would like to work for. They are great to start a conversation with as to who is the best person to contact re jobs in your space.