What you would do

Write original problems with a single checkable answer and a full worked solution, such as a counting problem whose answer is one exact integer.
Grade model proofs step by step and mark the first wrong step, such as an inequality applied in the wrong direction.
Review statistical claims for invalid inference, such as stopping a test early or running many comparisons without a correction.
Check model derivations numerically, for example by testing a closed form against a quick simulation.
Write rubrics that give credit for a correct method, not just a matching final answer.

What we look for

You study at or graduated from a college or university in mathematics, statistics or a related field.
Proof, analysis or modeling work you did yourself and can explain step by step, such as a thesis, a research project or a hard problem you solved and wrote up.
You write clear proofs and can find the gap in someone else’s argument.
Care with assumptions, edge cases and notation.

A degree in mathematics or statistics; a master’s or PhD is even better.
Research, teaching at university level or professional quantitative work, especially at an AI lab or AI company.
Publications, or national or international competition results such as the Putnam or an olympiad.
Fluency in LaTeX and in a computing tool such as Python, R or Mathematica.

Task size: Tasks take about 30 minutes to 5 hours. Each one shows its estimated time and price before you start, and you are paid that price even if it takes you more or less time.
Pay: Per task accepted in review: its estimated time times the project’s rate. A task estimated at 2 hours at $110 an hour pays $220. Accepted tasks are paid within 30 days.
Hours: Projects last 1 month to a year. Each sets a weekly minimum, usually about 20 hours of estimated work, and you choose when you work.
Tools and review: Your own computer, LaTeX for writing math, and Python, R or a similar tool for checking numbers. Every task is reviewed against the project’s written quality standard before it is accepted.