FlexJobs vs. Built In
FlexJobs
www.flexjobs.com/FlexJobs is a paid job board. It starts at $2.95 for a two-week trial or $9.95/month for a 3-month full access. It boasts over 40,000 hand-screened remote jobs.
Built In
builtin.com/Built In is a large job board for remote and non-remote tech jobs at startups and leading companies. You can filter jobs base don its remote status, date posted, experience, company size etc.