TrainBrain builds expert-authored training data and evaluations for AI labs. We're hiring practising professionals in three domains to write, solve, and grade the problems frontier models are measured against.

We're hiring domain specialists in:

• Finance & Accounting — accountants, financial analysts, controllers, auditors
• Software Engineering — working engineers across languages and problem domains
• Medicine & Healthcare — physicians, pharmacists, nurses, and clinical researchers

No AI background required. We train you on the tooling.

What you'd actually do

Every model that returns a broken function, a wrong reconciliation, or an unsafe clinical suggestion got there because no expert caught it during training. You'd be that expert.

• Write hard, realistic problems from your domain — the kind that sit right at the edge of what current models can handle
• Solve them yourself, so there's a verifiable correct answer
• Grade model attempts and explain precisely where the reasoning breaks down
• Refine tasks until both the difficulty and the gradability are right

This isn't your day job in a new wrapper. No clients, no month-end close, no tickets, no on-call. It's written work, on your own schedule.

What we look for

Deep hands-on experience in your field, excellent written English, and sharp attention to detail. Credentials help — CPA, CA, ACCA, CFA, MD, MBBS, PharmD, RN, a CS degree — but demonstrated expertise counts more than any specific letters. Above all, we want people who show their work and are comfortable saying "I'm not sure, and here's why."

Terms

• Pay: $45–$100/hr, set by domain, seniority, and assessment performance. Specialised and hard-to-source expertise sits at the top of the band. Paid on a regular cadence.
• Schedule: You choose your projects, hours, and volume. Scale up in quiet weeks, scale down when your day job gets busy.
• Growth: Strong contributors move into higher-rate specialist projects and review roles.
• Structure: 1099 independent contractor (or the local equivalent outside the US), not W-2 employment. You handle your own taxes; company benefits don't apply.