Recommended and mentioned products
Hired is the first two-sided marketplace created specifically for Engineers, Data Scientists...
See 1000s of startup jobs at the best startups. Get salary, equity and funding info upfront. Apply privately with one click. No recruiters, no spam. 20,000+ startups hiring.
Other thing you can suggest him is to "Cold email" startups who haven't opened job listings yet. https://angel.co/jobs.
Monster.com is one of the largest employment websites and job search engine in the world.
Get the paid LinkedIn subscription that way you will appear in more searches for recruiter. Also add your resume to monster.com (if he hasn't done already) be ready to pick up calls which are marked as spam. I.