Market landscapes / Training Data / Data Labelling & Annotation Services
Defined.ai
Enterprise AI training data platform. Defined.ai provides annotated datasets, data collection, and evaluation services for machine learning and generative AI across text, audio, image and video.
Data Labelling & Annotation Services51-200 peopledefined.ai ↗
Updated 9 November 2026
Hiring now
From Defined.ai's own jobs board, checked every week.
Where the roles are
Against its sector
22 of the 42 active companies in Data Labelling & Annotation Services are advertising roles. Welo Data has the most, with 183.
Who Defined.ai competes with
The other active companies we file under Data Labelling & Annotation Services, sorted by how much they are hiring.
Where this fits
Labelling and annotating the data models learn from, at scale and usually with people. It is the largest sub-sector in its theme at
We track hiring and team changes across all 174 companies in Training Data.
Our talent report for this sector shows how Defined.ai's team compares with its competitors.
What is in it:
- Every company's team size, side by side, grouped by sub-sector
- Who grew their team over the last year, and by how much
- Who is losing people: attrition for each company, against the sector average
- Who is hiring right now, and how many open roles each has
I am Ben Jackson. I map this market, and I hire the commercial teams inside it: sales, marketing, product and delivery.
If you are building a team at a company like Defined.ai, want to work at one, or think Defined.ai is filed in the wrong place, put 20 minutes in my diary.
Book 20 minutes with Ben →