StackAI
StackAI builds AI agents and automation tools for enterprise use across industries like healthcare, finance, and defense. The 80-person company raised $19M in a Series A round led by Gradient and other investors.
The growth story
StackAI grew from 3 to 80 employees between 2022 and 2026, raising $19M along the way, most recently a Series A in May 2026.
About
StackAI develops a platform for creating and deploying AI agents and automations, primarily targeting enterprise teams in finance, risk, and operations. Its tools aim to improve efficiency and scalability across industries including healthcare, legal, and logistics.
The company, founded in 2023, has grown to 80 employees and plans to double its team size by 2026. It has raised $19M in Series A funding from investors including Gradient and Guillermo Rauch.
Founders and leadership
Engineering is the largest function with 32 employees, representing 40% of the company. Leadership includes founders with backgrounds in AI and enterprise software.
The StackAI org chart
Toni Rosinol (Co-Founder & CEO) leads 11 mapped leaders with 3 direct reports. Click +N to expand a team; names link to the person’s public profile.
Departments, and which ones grew
Headcount by function: Engineering 38 (+46% YoY), Business Development 10 (+100% YoY), Arts and Design 3 (+200% YoY), Marketing 3 (-25% YoY), Sales 3 (+200% YoY), Information Technology 3 (0% YoY).
Talent flow
Employees come primarily from consulting firms like Deloitte and EY, as well as MIT and UC Berkeley. Alumni have founded companies including Karumi and Rebolt.
Most common previous employers of StackAI staff: Deloitte (4), Massachusetts Institute of Technology (3), GDS (3), Kaseya (3), MIT Sloan School of Management (3), EY (3). Former StackAI employees most often moved to Rebolt (2), Karumi (YC F25) (2), Finlai (2), Rightfit (1), AinTools.ai (1), Traza (1).
The StackAI mafia
Alumni have founded 9 companies, including Karumi (YC F25) and Rebolt, which together employ 17 people.
12Pablo Omenaca, was Founding engineer until 2025Toni Lopez, was Founding Engineer until 2025Sergio Ayala Miñano, was Founding Engineer until 2025Javier Sánchez, was Founding Engineer until 2025Manuel Ángel Suárez Álvarez, was Founding Engineer (AI/ML) until 2025German Parada Royo, was AI Engineer until 2026
Adrián Molina López, was AI Engineer until 2026
Sumit Singh, was Design Engineer until 2025
Yasser Tahiri, was Software Engineer until 2025
Kevin Bartley, was Content Lead until 2026
Daniel Belfort, was Founding Engineer (YC W23) until 2024
Henry Harari, was Business Development Intern until 2021What this company is made of
Most common skills at StackAI: Python (Programming Language) (34), Leadership (31), Microsoft Excel (28), Project Management (26), SQL (26), Teamwork (24), Public Speaking (24), Microsoft Office (22).
Where the team actually sits
StackAI people are concentrated in New York, United States (24), California, United States (15), United States (5), Spain (3). 2 offices on record.
Search footprint
StackAI attracts about 834 organic search visits a month, traffic worth roughly $15K a month if bought through ads. It gained 298 ranking keywords and lost 102 in the last period.
What employees say
- Compensation
- 5.00 / 5
- Career opportunities
- 5.00 / 5
- Senior management
- 5.00 / 5
- Work-life balance
- 5.00 / 5
Frequently asked
StackAI has 80 employees as of September 2026.
StackAI has raised $19M in total, most recently a Series A round in May 2026.
StackAI was founded in 2023 by Toni Rosinol, Bernard Aceituno.
Toni Rosinol (Co-Founder & CEO) sits at the top of StackAI's reporting structure, with 3 direct reports.
The most common previous employers of current StackAI staff are Deloitte (4 people), Massachusetts Institute of Technology (3 people), GDS (3 people).
Former StackAI employees most often move to Rebolt (2), Karumi (YC F25) (2), Finlai (2).
At least 9 companies have a founder who previously worked at StackAI, including Karumi (YC F25), Traza, Rebolt.
StackAI attracts about 834 organic search visits a month, worth roughly $15K a month in equivalent ad spend.
The most common skills among StackAI staff are Python (Programming Language), Leadership, Microsoft Excel, Project Management, SQL.
StackAI staff are concentrated in New York, United States (24), California, United States (15), United States (5).
StackAI has about 38 people in Engineering, up 46% over the past year, as of September 2026.
StackAI has about 10 people in Business Development, up 100% over the past year, as of September 2026.
Computed from 70 current and 34 former StackAI profiles, as of September 2026. Source: Crustdata.
Build this for any company
Every number on this page came from the Crustdata API. Point the MCP at a company and get the same org chart, alumni list and talent flow in one prompt.