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About Zetamu

A learning platform built by people who shipped learning at the scale you operate.

Founded in San Francisco in 2020 by an ex-Coursera principal engineer and a former Uber L&D head, Zetamu now powers 1.84 million active learners across 312 enterprise rollouts — and closed a $42M Series B led by Accel in March 2024.

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Founders

Engineering rigor meets enterprise learning operations.

The company was founded on a single observation: corporate learning platforms were being designed by people who had never operated a large workforce, and the people who had operated large workforces had never been given the engineering tools to fix it. Zetamu is what happens when both halves of that problem sit in the same room.

Black-and-white portrait of Dr. Amara Osei, co-founder and Chief Executive Officer of Zetamu.

Co-founder & Chief Executive Officer

Dr. Amara Osei

Amara spent seven years as a principal engineer at Coursera, where she led the personalization infrastructure that served the platform's first million paid enterprise learners. She holds a PhD in computational learning sciences from Stanford and started Zetamu after watching her former customers buy LMS renewals that solved none of the problems she'd seen firsthand.

Previous
Principal Engineer, Coursera
Education
PhD, Stanford
Focus
Adaptive pathways, skill-graph engine
Black-and-white portrait of Liam Castellanos, co-founder and Chief Operating Officer of Zetamu.

Co-founder & Chief Operating Officer

Liam Castellanos

Liam ran the global Learning & Development function at Uber through its post-IPO scale-up, managing reskilling budgets across 22,000 employees in 47 countries. He joined Amara to build the operating layer that engineering alone cannot deliver — the procurement integrations, the measurement frameworks, and the change-management practice that turn a platform into a working program.

Previous
Global L&D Head, Uber
Focus
Enterprise deployment, measurement
Based
Lisbon office

Zetamu, Inc. is headquartered at 548 Market Street, Suite 42100, San Francisco, CA 94104, with offices in Lisbon and Singapore.

Team & investors

A workforce of 214 across 14 countries. Backing from the firms that fund infrastructure software.

214

Employees across 14 countries as of January 2026.

$68M

Total funding across three rounds since 2020.

$42MSeries B

Led by Accel, March 2024, at a $310M valuation. Participation from Emergence Capital and GSV Ventures.

1.84M+

Active learners across 312 enterprise customers in Q1 2025.

Milestones

A paper trail of momentum, date-anchored.

  1. 2020

    Company founded in San Francisco.

    Dr. Amara Osei and Liam Castellanos incorporate Zetamu, Inc. to build adaptive learning pathways for enterprise workforces. Seed funding closed the same year.

  2. 2023

    Series A and first 100 enterprise deployments.

    Zetamu reaches its first 100 enterprise rollouts and begins building the proprietary skill-graph engine that now maps 4,200+ roles to 38,000 granular competencies.

  3. Mar 2024

    $42M Series B led by Accel at a $310M valuation.

    Participation from Emergence Capital and GSV Ventures. Total funding to date reaches $68M across three rounds. Zetamu is recognized as a 2024 Gartner Cool Vendor in Human Capital Management and ranks #412 on the 2024 Inc. 5000.

  4. 2025

    Lisbon and Singapore offices open; Q1 learner base passes 1.84M.

    European and APAC hubs established to support the 312-enterprise customer base. The Q1 2025 cohort measures a 97% course-completion rate across active learners and a 3.4x audited ROI on L&D spend.

Press & facts

An appendix for journalists, analysts, and procurement teams.

Everything below is sourced from primary filings, vendor reports, or our own audited metrics. We update this page whenever a new figure is verified.

Company

Legal name
Zetamu, Inc.
Headquarters
548 Market Street, Suite 42100, San Francisco, CA 94104, USA
Additional offices
Lisbon, Portugal · Singapore
Founded
2020
Founders
Dr. Amara Osei (CEO) · Liam Castellanos (COO)
Headcount
214 employees across 14 countries, as of January 2026

Recognition

2024 Gartner Cool Vendor
Human Capital Management (May 2024)
Inc. 5000
#412 on the 2024 list of fastest-growing private companies in America
EdTech Breakthrough Awards
"Best AI in Education," 2024
Aragon Research Globe
Fastest median AI-tutor response time benchmarked in the 2024 Corporate Learning Globe
G2 rating
4.86 / 5 average across 1,204 reviews — highest in the corporate learning category

Funding

Series B
$42M, March 2024, led by Accel at a $310M valuation. Participation from Emergence Capital and GSV Ventures.
Total raised
$68M across three rounds

Customers

Active learners
1,840,000+
Enterprise customers
312 deployments
Named Fortune 500 customers
Pfizer, Shopify, Klarna (47 of the Fortune 500 use Zetamu)
Skill gaps closed
Average of 2,140 per enterprise deployment

Compliance

Certifications
SOC 2 Type II · ISO 27001 · GDPR-Certified
Skill-graph
Largest open skill-graph in corporate L&D — 4,200+ roles mapped to 38,000 competencies, including the first SOC-compliant library for AI Risk & Governance roles

Next step

See your workforce's skill gaps, mapped in 30 minutes.

A capability assessment with our enterprise team benchmarks your current cohort against the role competencies that matter, and shows you the pathway to close them. No preparation required.

Book a Capability Assessment Email our team

[email protected] · +1 (415) 555-0182 · San Francisco · Lisbon · Singapore