Skip to content
AI Training Pay
esc
  • Loading roles…
  • Pages and tools

OpenTrainPhDMaster's

Materials Science Expert Technical Evaluation

You will create and assess challenging technical problems used to train and evaluate AI systems. Your work will combine deep materials science knowledge with careful scientific judgment.

Field
Chemistry
Where
United States, Algeria, Argentina, Austria, Bahrain, Bangladesh +46 more
Commitment
part time
Asks for
PhD, Master's
Posted
11 days ago

Pay data for your profession: Science AI trainer jobs · PhD AI trainer jobs · Chemistry AI trainer jobs

How this pay compares

The title points to rating and reviewing ai output: judging a model's answers or code against guidelines, such as which of two is better or whether one is correct and safe. What each kind of AI training work pays

At $135/hr (the midpoint of $85 to $185), this role pays more than 91% of the 51 open chemistry roles with a listed pay range, above the median of $83.

Open chemistry roles that ask for a PhD have a median of $79/hr (32 roles).

Among platforms with 10 or more priced chemistry roles, Mercor has the highest median ($85/hr across 11 roles) and OpenTrain AI the lowest ($75/hr across 25).

OpenTrain AI roles that closed since late October stayed listed a median of 31 days (122 roles). OpenTrain AI posted this one 11 days ago.

Computed from 2,746 open roles we track across Mercor, micro1, Handshake AI, Alignerr, Appen and OpenTrain AI, refreshed daily. Midpoints of listed ranges; “up to” ceilings are left out of medians.

What you would earn at this rate

Per week, before tax

$2,025

Per month, if the work is steady

$8,775

Tax
Contract pay arrives with no tax withheld. A US contractor at this rate and these hours would set aside about $2,218 a month for self-employment tax plus federal income tax at the 12% bracket (25%, before state tax). Outside the US, your own country's rules apply.

Assumes paid hours only; unpaid assessments, onboarding and gaps between projects lower the real figure. Full take-home calculator · Track what you actually earn

Open chemistry roles on each platform

The same kind of work, priced on every platform we track, with the best-paid open role on each.

PlatformOpenMedianBest-paid open role
Mercor11$85/hrChemistry Domain Expert$90-140/hr
Alignerr13$83/hrChemist, PhD$90-120/hr
OpenTrain AIthis role25$75/hrComputational Materials Science Expert$175/hr
Handshake AI6up to $58/hrChemistry ExpertUp to $150/hr

“Up to” rows list only ceilings, so their median is a maximum, not comparable with the range midpoints above them.

All 57 open chemistry roles →

The full listing

As posted on OpenTrain AI. See the original

The work

You will create and assess challenging technical problems used to train and evaluate AI systems. Your work will combine deep materials science knowledge with careful scientific judgment.

Problems may cover metals and alloys, ceramics and glasses, polymers and composites, semiconductors, thin films, characterization, computational materials, mechanical behavior, corrosion, or additive manufacturing materials.

  • Design difficult problems involving structure-property relationships, materials processing, characterization, failure analysis, and computational materials.
  • Build realistic technical scenarios with constraints and supporting data that require more than a textbook answer.
  • Provide the correct analysis and explain the reasoning clearly enough for another scientist to verify.
  • Create objective grading criteria so independent expert reviewers can reach the same conclusion.
  • Review other contributors' problems for technical accuracy, sound methods, and clear grading.
  • Identify problems that are ambiguous or cannot be evaluated reliably.

What it pays and takes

This is a fully remote contractor opportunity with flexible part-time work designed to fit alongside your current role.

  • $85 to $185 per hour.
  • Open to candidates in the listed countries across the Americas, Europe, Africa, Asia, and the Middle East.
  • Professional fluency in English.
  • A master's degree or PhD in materials science, metallurgy, ceramics, polymer science, condensed matter physics, or a closely related field.
  • Principal-, staff-, or fellow-level experience in industrial or national laboratory research, or a faculty appointment at a leading university.
  • Deep technical expertise and hands-on ownership in at least one materials science subdomain.
  • Strong engineering and scientific judgment when interpreting constraints and comparing possible solutions.
  • Ability to explain why an answer is correct so another scientist can verify it independently.
  • Publications, patents, or technical leadership experience are helpful.
  • Experience with AI or large-language-model evaluation is helpful but not required.

How it works

You apply here in about two minutes and finish on the hiring platform. The next step is a short AI interview (technical roles include a coding challenge). Passing it is how you qualify for paid tasks, so take it soon after you are invited.

The hiring platform's application for this job asks for your resume, your LinkedIn profile, your phone number, your location and answers to 8 screening questions.

About AI training work

AI training work is the human side of building artificial intelligence. Experts create examples, write solutions, and review model responses so AI systems can produce more accurate and useful results. People with deep technical experience are needed when the work requires sound judgment in a specialized field.

From applying to your first payment on OpenTrain AI

  1. 1

    Create a profile

    Create a free OpenTrain profile with your domains, languages and hourly rate.

  2. 2

    Apply

    Apply to the listing. Some listings hire through OpenTrain; others send you to the hiring platform.

  3. 3

    Funded milestones

    The client funds each milestone before work starts.

  4. 4

    First payment

    OpenTrain pays out to your connected payout method when the client approves the milestone. It doesn't publish a fixed payout schedule.

Sources: OpenTrain: AI training careers, OpenTrain docs: invoicing and payouts

Full OpenTrain AI profile: watch-outs and the public record →

Pay history

OpenTrain AI has listed this role at $85-185/hr since Nov 1, 2026 with no change.

Across OpenTrain AI's chemistry roles, the median listed pay was $70/hr on Nov 1, 2026 (13 roles) and is $75/hr as of Nov 11, 2026 (25 roles).

What workers report about OpenTrain AI

Anonymous reports from people who applied or worked there: whether they got work, what they were paid and how fast.

Other chemistry roles

All 57 chemistry roles →