Meridial AI

Meridial is the expert-contractor marketplace operated by Invisible Technologies, connecting a global network of 24,000+ vetted domain specialists with AI training projects that require deep human judgment. Contributors evaluate AI-generated responses, write domain-specific prompts, assess reasoning quality, identify errors, and provide expert review for frontier model labs and enterprises. Project areas span legal reasoning, STEM research, software engineering, financial analysis, linguistics and translation, AI safety evaluation, and creative writing. Meridial operates within Invisible's compliance infrastructure (SOC 2, HIPAA, GDPR) and powers customers including Microsoft, Nasdaq, Cohere, AWS, and AI21 Labs. Open projects are listed at https://www.meridial.ai/projects.

Contributors are independent contractors, not Meridial employees. Onboarding: select skills and languages, share background and availability, complete domain-expertise verification (STEM, law, safety, linguistics, coding, etc.), pass ID verification, then receive an invitation to the marketplace. Qualified experts can begin reviewing project invitations within ~48 hours. The schedule is fully flexible, no minimum or maximum hours, and you can accept or decline each project. Engagements are not guaranteed and depend on client demand, specialization, and language coverage. Confidentiality agreements may be required per project. Contractors supply their own secure computer and internet; no employee benefits (health insurance, PTO) apply.