Sei Labs
Sei Labs is a blockchain infrastructure developer that raised $35M in Series A funding in April 2023. The San Francisco-based company employs 112 people, mostly engineers.
The growth story
Sei Labs grew from 55 to 112 employees between 2023 and 2026, raising $35M along the way, most recently a Series A in April 2023.
About
Sei Labs builds blockchain infrastructure products for global scale applications. Its R&D focus suggests it targets enterprise and developer customers needing scalable blockchain solutions.
The company has grown rapidly since its 2021 founding, reaching 112 employees with significant backing from crypto-focused VCs like Coinbase Ventures and Delphi Ventures. Its $35M Series A round indicates strong investor confidence in its blockchain infrastructure approach.
Founders and leadership
Engineering dominates Sei Labs' organization with 16 engineers, reflecting its product-driven R&D focus. The company maintains a relatively flat structure typical of startups, with a median tenure of 2 years suggesting steady turnover.
The Sei Labs org chart
Jeff F. (Co-Founder) leads 10 mapped leaders with 5 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 20 (+18% YoY), Operations 16 (+14% YoY), Community and Social Services 7 (0% YoY), Marketing 6 (+100% YoY), Administrative 6 (+20% YoY), Business Development 5 (0% YoY).
Talent flow
Sei Labs recruits heavily from major tech companies, with Google being the top source (7 hires). It also draws talent from crypto-native firms like Coinbase and Ripple. Alumni have founded 6 companies, mostly in blockchain and AI.
Most common previous employers of Sei Labs staff: Google (7), Robinhood (3), Facebook (3), Ripple (2), Coinbase (2), Airbnb (2). Former Sei Labs employees most often moved to TechChain Talent (1), Outerscope (1), Bodhi Ventures (1), Wafer (1), Premsurv (1), Synapse (1).
The Sei Labs mafia
Sei Labs alumni have founded 6 companies, including Wafer (8 staff) and Synapse (7 staff). Most mafia companies operate in blockchain and AI, suggesting Sei Labs cultivates expertise in these domains.
6Steven Arellano, was Software Engineer until 2022Susie Chen, was Founding Engineer until 2022Luci Holland, was Community & Growth Strategy until 2022Luke Rosa, was Growth until 2023Brandon W., was Software Engineer until 2023Cyson Liao, was Engineering Lead until 2024What this company is made of
Most common skills at Sei Labs: Blockchain (17), Python (Programming Language) (16), Java (15), Project Management (13), Microsoft Office (12), Leadership (12), Management (11), C (Programming Language) (11).
Where the team actually sits
Sei Labs people are concentrated in New York, United States (9), United States (6), San Francisco Bay Area (4), California, United States (4).
Search footprint
Sei Labs attracts about 2 organic search visits a month. It gained 0 ranking keywords and lost 3 in the last period.
Frequently asked
Sei Labs has 112 employees as of September 2026.
Sei Labs has raised $35M in total, most recently a Series A round in April 2023.
Sei Labs was founded in 2021 by Jeff F., Jayendra Jog.
Jeff F. (Co-Founder) sits at the top of Sei Labs's reporting structure, with 5 direct reports.
The most common previous employers of current Sei Labs staff are Google (7 people), Robinhood (3 people), Facebook (3 people).
Former Sei Labs employees most often move to TechChain Talent (1), Outerscope (1), Bodhi Ventures (1).
At least 6 companies have a founder who previously worked at Sei Labs, including Wafer, Synapse, VERITAS.
Sei Labs attracts about 2 organic search visits a month.
The most common skills among Sei Labs staff are Blockchain, Python (Programming Language), Java, Project Management, Microsoft Office.
Sei Labs staff are concentrated in New York, United States (9), United States (6), San Francisco Bay Area (4).
Sei Labs has about 20 people in Engineering, up 18% over the past year, as of September 2026.
Sei Labs has about 16 people in Operations, up 14% over the past year, as of September 2026.
Computed from 48 current and 51 former Sei Labs profiles, as of September 2026. Source: Crustdata.
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