Human data for AI
Prolific
Human data for AI. Labs and researchers use its pool of verified, fairly paid people to train and test AI models and to run studies.
- Based in London, New York and San Francisco
- 160+ in the UK
- Founded 2014
- 28 open roles
Jack’s take, why it stands out
“Prolific supplies the people AI labs rely on to train and test their models: more than 300,000 of them, verified and paid fairly. Its CEO says revenue passed $300M a year in April, on about $33M of funding. Most of the team works remotely, with hubs in London, New York and San Francisco.”
Jack’s take on Prolific
The questions candidates ask me about a company, answered for Prolific
Revenue passed $300M a year in April, its CEO says
Annualized revenue as its CEO reported it in May, unaudited. Prolific hasn’t said whether it includes what customers pay participants, or whether it reached the $500M target.
Under $10M a year six years earlier.
Its UK company’s audited 2025 accounts show about $38M of revenue (up 48%, with most of that growth coming from fees charged to its US sister company), an 81% gross margin and a loss of about $3.8M, smaller than in 2024.
No layoffs reported.
It has raised about $33M, most of it in a 2023 Series A
Raised in each round: seed and Series A.
Partech
Oxford Science Enterprises
Y Combinator
Pioneer Fund
AltaIR CapitalProfitable in 2020, but its UK company has reported a loss every year since.
It hasn’t disclosed a valuation.
Its UK team grew from 102 to 162 people in two years
Average people employed each year by its UK company. Staff of its US company, which began trading in 2024, aren’t included. Dublin is on the shortlist for its next hub.
Key leaders
Phelim BradleyCofounder and CEO
University of Oxford
Jemma WhiteCOO, also interim CFO
Enzo BlindowVP of data and AI, joined 2024
MetaPhelim cofounded Prolific with Ekaterina Damer in 2014, while both were doctoral students, and became CEO in 2021 after seven years as CTO. VP of engineering Helin Ece Akgül joined from Wise in 2025, and VP of AI Brennan Smith from TaskUs. Its chief technology and product officer, Badrudin Khan, left in June 2026.
A remote-first team with hubs in three cities
Where. Most people work from home full time. Hubs in King’s Cross in London, Union Square in New York and near Salesforce Park in San Francisco, or a coworking space near you.
The pace. One of its six principles is to make every minute count, acting with urgency and ownership.
Meeting up. Each team has a budget to meet in person, and everyone gathers for three days a year at Prolificon.
Time off. 33 days a year including public holidays, plus five days of study leave. People may finish two hours early on Fridays, for a 38-hour week.
Ownership. Share options for every new hire, vesting over four years with a one-year cliff, and a yearly learning budget.
Ai2 cut its human data collection from weeks to hours
Ai2Pilot data back in hours and full datasets within a week, for its multimodal models.
Collective Intelligence ProjectGlobal Dialogues on AI with about 1,000 people from more than 60 countries in each round.
Oxford Internet Institute1,101 people chatted with AI chatbots to test how human they seem.More than 300,000 people take part, 90,000 of them qualified in fields like healthcare and engineering. Prolific has paid them more than $500M.
What candidates tell Jack
“The challenge of making AI reliable is an enormously important problem, and Prolific’s model appeals to me from both a practical and ethical perspective.”
Is there a role for you?
28 open roles, straight from Prolific’s careers page. Hiring in the UK (14), the US (8), Mexico (4) and 1 other place. Pick a place and an area for Jack’s read and the roles.
Jack’s read for engineering, data and ai
6 open roles
- VP of data and AI Enzo Blindow leads its data and AI work, including a research group that had a spotlight paper at ICML 2026.
- 50+ AI models ranked on HUMAINE, its leaderboard built on blind conversations with more than 48,000 people.
- Engineers work in Python and TypeScript, with Vue.js and Django, on AWS and GCP. VP of engineering Helin Ece Akgül joined from Wise in 2025.
Our hiring guides: pay, time to fill and who gets hired
Jack’s read for human data services and operations
14 open roles
- 300,000+ people in its network, 90,000 of them qualified in fields like healthcare and engineering.
- Its AI data services team is new, and some roles here are on its founding team. VP of AI Brennan Smith joined from TaskUs in 2025 and is based in New York.
- AI labs can reach more than 20,000 credentials-checked doctors, nurses and other health professionals.
6 moreShow all
Jack’s read for product and design
3 open roles
- Customers run studies in its web app or through its API, and it now has an MCP server too.
- 35,000+ AI developers, researchers and organizations use Prolific, and a new study launches every two minutes.
Jack’s read for sales, customer success and marketing
4 open roles
- Its San Francisco hub is there to be close to the teams building AI, its CEO says.
- Customers include Ai2, Google and Stanford University.
Jack’s read for operations, people and finance
1 open role
- COO Jemma White also covers the CFO role for now.
- 162 people worked for its UK company on average in 2025, up from 145 in 2024.
- Dublin is on the shortlist for its next hub.
New roles most weeks since July
New roles each week worldwide, July to October 2026, from our daily checks of its careers page.
Closed roles45 since late June
The most recent, as of November 5, 2026.
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The full ranking
About this page
Jack & Jill isn’t Prolific’s recruiter. The open roles come straight from Prolific’s public careers page and refresh through the day. Company facts come from Prolific’s own announcements and named press, linked on each card, and were last checked on November 6, 2026. Jack’s take is Jack & Jill’s own.