Flatiron Health
Flatiron Health provides oncology-focused software and analytics to improve cancer care, with 1,455 employees. The company has raised $325 million, most recently in a Series D round in December 2021. Flatiron Health develops software and analytics tools for oncology practices and researchers to streamline cancer care and improve treatment outcomes. Its platform aggregates and analyzes clinical data from cancer patients to support research and decision-making. The company has raised $325 million in funding, with investors including Andreessen Horowitz and Casdin Capital, and employs over 1,400 people. Flatiron Health’s engineering team is its largest function, with 107 employees. The company draws leadership and technical talent from institutions like Memorial Sloan Kettering Cancer Center and Epic, and its workforce includes graduates from top schools such as UC Berkeley and the University of Pennsylvania. Flatiron Health hires heavily from healthcare and tech organizations, including Memorial Sloan Kettering Cancer Center, Epic, and Google. Its alumni often move to roles in healthcare startups like Thyme Care and Pomelo Care. Flatiron Health alumni have founded 52 companies, including Thyme Care, Pomelo Care, and House Rx. These startups focus on healthcare innovation, with several scaling to hundreds of employees.
The growth story
Flatiron Health grew from 1,454 to 1,455 employees between 2021 and 2026, raising $325M along the way, most recently a Series D in December 2021.
About
Flatiron Health’s mission is to improve and extend lives by learning from the experience of every person with cancer.
Founders and leadership
The Flatiron Health org chart
Nathan Hubbard (Chief Executive Officer) leads 60 mapped leaders with 6 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 253 (-10% YoY), Real Estate 207 (-8% YoY), Arts and Design 188 (-4% YoY), Healthcare Services 167 (-3% YoY), Information Technology 103 (-21% YoY), Research 91 (-13% YoY).
Talent flow
Most common previous employers of Flatiron Health staff: Memorial Sloan Kettering Cancer Center (33), Epic (16), Deloitte (13), ClearView Healthcare Partners (11), Google (10), University of Pennsylvania (9). Former Flatiron Health employees most often moved to Pomelo Care (14), Thyme Care (13), Tempus AI (12), Paradigm Health (11), Meta (8), Anthropic (7).
Alumni worth knowing
The Flatiron Health mafia
56Bobby Green, M.D., was Chief Medical Officer until 2021Robin Shah, was Vice President, Provider Marketing and Strategy until 2018Marta Bralic Kerns, was Senior Vice President of Business Development until 2021Ogi Kavazovic, was Chief Marketing Officer & SVP, Product Strategy until 2018Zach Weinberg, was Co-Founder, President & COO (Acquired by Roche) until 2021
Brad Frazier, was VP, Life Sciences until 2017
Lauren Urke, was Manager, Academic Partnerships until 2021
Mark Hannan, was Software Developer until 2021
Daniel Buchmueller, was Director Of Engineering until 2018
Ben Birnbaum, was Senior Director of Engineering, ML Team until 2021
Josh Haimson, was Director, Product Management until 2021
Ian Rapoport, was Director, New Market Development (International) until 2021Hillary Mager, was Head of Recruiting until 2019
Jim Martineau, was Director, Product Management & Operations until 2020
Jeremy Feinstein, was Staff Software Engineering Manager & Architect until 2021
Alex Ingram, was Director of Product Management until 2018
Victor Mota, was Software Engineering Intern until 2015
Kexin Huang, was Machine Learning Research Intern until 2020
Lura Long, was Head of Solutions Management, Customer Experience [Real-World Evidence] until 2023
Samy Danesh, was Life Science Partnerships until 2023
Shruti Tibrewala, was Principal, Life Sciences until 2023
Amy Abernethy, was Chief Medical Officer/Chief Scientific Officer & SVP Oncology until 2019
Brad Hirsch, was Senior Medical Director until 2017
Breno Neri, was Director, Quantitative Sciences until 2020
Varshil Patel, was Senior Product Manager until 2019
David Cirilli, was Director of Communications until 2019
Adrienne Chen, was Director of Marketing until 2016
Andrew Shinohara, was VP of Engineering, Platform until 2025
Alex Ritchie, was Product Marketing Manager until 2021
Ben Khakshoor, was Product Security Engineer until 2021
Joe Delgado, was Tech Lead, Design Systems until 2018
Coleman Hindes, was Senior Software Engineer until 2021
Aashna Shah, was Product Manager until 2023
Linda Thornton, was Forward Deployed Engineer until 2015
Vivek Hazari, was Data Insights Engineer until 2021
Bianca Pais, was Product Operations Manager until 2024
Dani Kiyasseh, DPhil, was Machine Learning Research Intern until 2021
Shelden Shi, was Software Engineer until 2022
Sid Unnithan, was Data Insights Engineer until 2017
Sahir Raoof, was Biopharma Partnerships until 2020
Nate Gosselin, was Director, Product Management until 2021
Adam Stasiw, was Senior Software Engineer until 2023
Naiqiao (Nick) Liang, was Senior Software Engineer until 2021
John Van Antwerp, was Product Management until 2020
Tanya T., was Senior Director of Brand and Web until 2024
Claudia M. Hall DNP RN, was Senior Health Informaticist until 2023
Marc Berger, was General Counsel / VP, Legal until 2018
Allison Canton, was Associate General Counsel until 2021
Matthew Eggertson, was Data Insights Engineer until 2016
David Deng, was Software Engineer until 2020
Kanwar Kultar Gill, was Engineering Manager, Site Reliability Engineering until 2019Hiring now
Web traffic
Traffic mix: 12% direct, 28% search, 11% social, 1% paid.
What this company is made of
Most common skills at Flatiron Health: Microsoft Office (411), Research Skills (357), Data Analysis (355), Microsoft Excel (335), Healthcare (321), Leadership (318), Project Management (278), Oncology (271).
Where the team actually sits
Flatiron Health people are concentrated in New York, United States (223), New York City Metropolitan Area (76), North Carolina, United States (30), United States (30).
Search footprint
Flatiron Health attracts about 3,605 organic search visits a month, traffic worth roughly $26K a month if bought through ads. It gained 462 ranking keywords and lost 381 in the last period.
What employees say
- Compensation
- 3.40 / 5
- Career opportunities
- 2.80 / 5
- Senior management
- 2.60 / 5
- Work-life balance
- 3.90 / 5
Frequently asked
Flatiron Health has 1,455 employees as of September 2026.
Flatiron Health has raised $325M in total, most recently a Series D round in December 2021.
Nathan Hubbard (Chief Executive Officer) sits at the top of Flatiron Health's reporting structure, with 6 direct reports.
The most common previous employers of current Flatiron Health staff are Memorial Sloan Kettering Cancer Center (33 people), Epic (16 people), Deloitte (13 people).
Former Flatiron Health employees most often move to Pomelo Care (14), Thyme Care (13), Tempus AI (12).
At least 52 companies have a founder who previously worked at Flatiron Health, including BridgeBio, Thyme Care, Pomelo Care.
Flatiron Health attracts about 3,605 organic search visits a month, worth roughly $26K a month in equivalent ad spend.
The most common skills among Flatiron Health staff are Microsoft Office, Research Skills, Data Analysis, Microsoft Excel, Healthcare.
Flatiron Health staff are concentrated in New York, United States (223), New York City Metropolitan Area (76), North Carolina, United States (30).
Flatiron Health has about 253 people in Engineering, down 10% over the past year, as of September 2026.
Flatiron Health has about 207 people in Real Estate, down 8% over the past year, as of September 2026.
Computed from 600 current and 871 former Flatiron Health profiles, as of September 2026. Source: Crustdata.
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