DataAnnotationA platform paying contributors to train AI models through writing, coding, and evaluation tasks. Known for higher hourly rates than classic microtask sites.
Fees Hourly, from about $25/hr (general projects), more for specialist workdataannotation.tech
HackerEarthA platform hosting coding challenges and hackathons with cash prizes and hiring contests.
Fees Free to enter, host-funded prizeshackerearth.com