HumanSignal
HumanSignal develops data labeling tools for AI model training, best known for its open source Label Studio platform used by over 250,000 users to annotate 100 million data points. The San Francisco-based company, founded in 2019, has raised $29M and employs 132 people.
The growth story
HumanSignal grew from 15 to 132 employees between 2021 and 2026, raising $29M along the way, most recently a Series A in May 2022.
About
HumanSignal sells software that helps data science teams prepare and label datasets for AI model development. Its core product, Label Studio, is an open source platform for annotating data, which companies use to train, fine-tune, and validate machine learning models. A cloud-based enterprise version adds security features for business use.
The company has scaled rapidly since its 2019 founding, reaching 132 employees and securing $29M in Series A funding in 2022. Its open source Label Studio platform has achieved significant traction, with a community of 250,000 users collectively annotating over 100 million data points.
Founders and leadership
Engineering is HumanSignal's largest function, with 23 employees. The company has a median tenure of 3 years, suggesting stable leadership and team retention.
The HumanSignal org chart
Michael Malyuk (Co-Founder) leads 27 mapped leaders with 2 direct reports. Click +N to expand a team; names link to the person’s public profile.
Departments, and which ones grew
Headcount by function: Operations 23 (+360% YoY), Arts and Design 21 (+2000% YoY), Engineering 19 (+6% YoY), Legal 12 (+33% YoY), Sales 7 (+40% YoY), Information Technology 6 (+200% YoY).
Talent flow
HumanSignal recruits heavily from AI and data labeling competitors, with multiple hires from Labelbox, Amazon, and SuperAnnotate. Its workforce includes graduates from UC Berkeley, Northeastern University, and McGill University.
Most common previous employers of HumanSignal staff: Labelbox (4), Amazon (4), SuperAnnotate (2), Grafana Labs (2), Aspiring Product Managers Club @ Northeastern University (2), Netlify (2). Former HumanSignal employees most often moved to UpKeep (2), Proxima (2), Staffer (1), ZeroClick (1), ApexStone Capital (1), CloudZero (1).
Alumni worth knowing
Hiring now
Web traffic
Traffic mix: 45% direct, 40% search, 2% social, 1% paid.
What this company is made of
Most common skills at HumanSignal: Microsoft Office (44), Communication (36), Adobe Photoshop (32), Graphic Design (31), Project Management (31), Python (Programming Language) (29), Leadership (29), Microsoft Excel (26).
Where the team actually sits
HumanSignal people are concentrated in California, United States (10), Texas, United States (5), United States (5), Florida, United States (3).
Search footprint
HumanSignal attracts about 177 organic search visits a month, traffic worth roughly $9K a month if bought through ads. It gained 182 ranking keywords and lost 138 in the last period.
What employees say
- Compensation
- 3.20 / 5
- Career opportunities
- 3.40 / 5
- Senior management
- 3.80 / 5
- Work-life balance
- 4.10 / 5
Frequently asked
HumanSignal has 132 employees as of September 2026.
HumanSignal has raised $29M in total, most recently a Series A round in May 2022.
HumanSignal was founded in 2019 by Michael Malyuk, Maxim Tkachenko.
Michael Malyuk (Co-Founder) sits at the top of HumanSignal's reporting structure, with 2 direct reports.
The most common previous employers of current HumanSignal staff are Labelbox (4 people), Amazon (4 people), SuperAnnotate (2 people).
Former HumanSignal employees most often move to UpKeep (2), Proxima (2), Staffer (1).
HumanSignal attracts about 177 organic search visits a month, worth roughly $9K a month in equivalent ad spend.
The most common skills among HumanSignal staff are Microsoft Office, Communication, Adobe Photoshop, Graphic Design, Project Management.
HumanSignal staff are concentrated in California, United States (10), Texas, United States (5), United States (5).
HumanSignal has about 23 people in Operations, up 360% over the past year, as of September 2026.
HumanSignal has about 21 people in Arts and Design, up 2000% over the past year, as of September 2026.
Computed from 79 current and 54 former HumanSignal profiles, as of September 2026. Source: Crustdata.
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