When posting a job, you have the option to make it a invite-only posting.  Only freelancers that you invite to your job will be able to submit proposals.  This is called an Invite-Only job and is not posted publicly in the job search results.

To post a private invite-only job, choose Private in the Job Posting Visibility section under Advanced Options on the job post form.

If you would like to invite more freelancers to submit proposals on any job (up to 30), you may do so by following the steps below:

1. Search for freelancers with a particular skill or expertise.
2. Once you have found freelancer(s) that meet your needs, click on the freelancer's name to see their service profile containing detailed service description, experience, skills, credentials, feedback and work samples.
3. Click on Contact or post a job button on the top right.  You will see an Invite to Bid popup.  If you already have active jobs, they will appear in this list. You can either choose an existing job or create a new one.
4. You can invite one or more freelancers at a time by placing check mark(s) in the Invite to Bid column and then clicking on the Invite to Bid button at the top of the column. If you already have active jobs, they will appear in this list. You can either choose an existing job or create a new one.

You can also add freelancers from the job post page by clicking the Invites link in the Overview tab and entering a freelancer's username to invite them to submit a proposal on your posted job.

Note: You are limited to 30 invites per job posting.