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OpenTrain

Chemical Engineer Expert, AI Evaluation

Create expert evaluation examples for testing how AI models judge chemical process design and safety. You will use practical chemical engineering knowledge to assess whether proposed processes are technically sound, safe, and feasible at scale.

Field
Chemistry
Where
United States, Albania, Algeria, Antigua and Barbuda, Armenia, Australia +89 more
Hours
up to 10/week
Posted
4 days ago

Pay data for your profession: Science 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 $115/hr (the midpoint of $100 to $130), this role pays more than 87% of the 51 open chemistry roles with a listed pay range, above the median of $83.

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 4 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

$1,150

Per month, if the work is steady

$4,983

Tax
Contract pay arrives with no tax withheld. A US contractor at this rate and these hours would set aside about $1,260 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

Create expert evaluation examples for testing how AI models judge chemical process design and safety. You will use practical chemical engineering knowledge to assess whether proposed processes are technically sound, safe, and feasible at scale.

  • Write realistic process scenarios, from mass balances through safety reviews.
  • Prepare reference answers that explain the process and safety reasoning behind each decision.
  • Grade model responses for technical accuracy and process safety.
  • Identify designs that seem plausible but would be unsafe or infeasible at scale.
  • Document your reasoning clearly so technical decisions can be reviewed and used in evaluation data.

What it pays and takes

  • Pay: $100 to $130 per hour, paid weekly.
  • Work: Ongoing independent-contractor projects; fully remote and asynchronous, with no fixed hours and a minimum commitment of 10 hours per week.
  • Location: Remote; open to candidates in eligible countries.
  • Education and experience: A degree in chemical engineering or a closely related field, plus at least two years of process, plant, or product engineering experience.
  • Expertise: Demonstrated depth in process design, process safety, or scale-up.
  • Communication: Clear written English and the ability to explain technical process decisions.
  • Helpful background: Professional engineering licensure or process safety certification; experience with Aspen Plus, HYSYS, or similar process simulation tools; or regulated-industry experience in pharmaceutical or petrochemical work.

How it works

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

About AI training work

AI training work uses human-created examples and reviews to help build and evaluate artificial intelligence. OpenTrain helps people find and apply for AI training and data-labeling work; this project relies on chemical engineering expertise to assess whether AI responses are accurate and safe.

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 $100-130/hr since Nov 10, 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 →