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OpenTrainPhDMaster's

Chemistry Expert, Problem Design and AI Evaluation

You will create advanced chemistry questions and solutions used to train and evaluate AI models. The work focuses on real-world chemical principles and requires careful judgment of complex scientific reasoning.

Field
Chemistry
Where
Albania, Algeria, Antigua and Barbuda, Armenia, Australia, Austria +88 more
Commitment
part time
Hours
up to 20/week
Asks for
PhD, Master's
Posted
6 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 $75/hr, this role pays more than 42% of the 51 open chemistry roles with a listed pay range, below 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 6 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

Rate

$75/hr

Per week, before tax

$1,500

Per month, if the work is steady

$6,500

Tax
Contract pay arrives with no tax withheld. A US contractor at this rate and these hours would set aside about $1,643 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 advanced chemistry questions and solutions used to train and evaluate AI models. The work focuses on real-world chemical principles and requires careful judgment of complex scientific reasoning.

You will also review AI-generated answers, identify errors or missing details, and write clear feedback that improves the quality and reliability of future responses.

  • Develop graduate-level and PhD-level chemistry problems and solutions.
  • Write realistic, challenging prompts based on chemical principles.
  • Evaluate AI responses for accuracy, completeness, and understanding.
  • Identify weaknesses in scientific reasoning and explain precise corrections.
  • Use analytical judgment, experimental-design skills, and critical writing.

What it pays and takes

This is a remote, part-time contract engagement with project-based assignments.

  • $75 per hour.
  • 20+ hours per week.
  • Remote, with eligibility based on the countries listed for this role.
  • Professional fluency in English.
  • A master's degree or PhD in chemistry, chemical engineering, biochemistry, or a related field.
  • At least two years of experience in academic research, industrial research and development, or applied chemistry.
  • Ability to create and assess graduate-level and PhD-level chemistry problems and solutions.
  • Ability to interpret complex data accurately and explain advanced chemical concepts clearly.
  • Published research or technical reports and strong scientific communication skills are helpful.
  • Familiarity with organic, inorganic, physical, and analytical chemistry is helpful.
  • Prior exposure to AI or machine-learning environments or interdisciplinary work is helpful.

How it works

Apply on OpenTrain with your resume, then complete the application on the hiring site.

About AI training work

AI training work is the human side of building artificial intelligence: people create examples, write prompts, and review model responses so AI systems become more accurate and useful. Specialists are paid for applying real subject knowledge to judge complex outputs and explain what needs to improve. OpenTrain is a platform where people find these projects, build a profile, and apply.

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 $75/hr since Nov 5, 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 →