What departments does Callsign have?

Callsign has employees across 17 departments including Human Resources, Information Technology, Entrepreneurship, Finance, Information Security.

What is the largest department at Callsign?

The largest department at Callsign is Engineering with 7 employees.

Where are Callsign employees located globally?

Callsign has employees across 4 continents and 17 countries including South Africa, India, United Arab Emirates, Saudi Arabia, Pakistan.

How has Callsign's team size changed over time?

Callsign's team has decreased from approximately 302 to 219 employees based on available data.

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Callsign Employee Directory

Q: Who are Callsign's key employees and leadership?

Callsign's key employees include: Chairman & Ceo: Z. H., Chief Information Officer: A. P., Chief Revenue Officer: S. O., Chief Security Officer: I. C. C., Chief Financial Officer: G. W.

Computer and Network SecurityEngland, United Kingdom201-500 Employees

Callsign is a London, England, United Kingdom-based company in the computer and network security industry, employing between 201 and 500 people. It develops digital-trust solutions that mimic human identification to distinguish genuine users, aiming to provide privacy and security with minimal friction while blocking bad actors. The company reports that its user recognition can reach up to 99.999% accuracy. It has formed partnerships with Visa in 2023 and with State Talking in 2026, and was named a Leader in Product Vitals in Javelin Strategy & Research's 2024 Authentication and Identity-Proofing Vendor Solutions Scorecard. Reported revenue is in the range of $25 million to $50 million, and its technology stack includes Zipkin, Continuous Delivery, XML, DocuSign, Microsoft Office, Ruby, Scala, and Google Tag Manager.

Callsign Global Highlights

Europe
170

United Kingdom Of Great Britain And Northern Ireland
164
Sweden
2
Serbia
1
Italy
1
Switzerland
1
Ireland
1

Asia
73

United Arab Emirates
48
India
12
Pakistan
7
Philippines
2
Saudi Arabia
1
Singapore
1
Indonesia
1
Malaysia
1

North America
12

United States Of America
11
Canada
1

Africa
2

South Africa
2

Callsign's Leadership

A. P.
Chief Information Officer
Mobile Phone
Email
S. O.
Chief Revenue Officer
Mobile Phone
Email
I. C. C.
Chief Security Officer
Mobile Phone
Email
G. W.
Chief Financial Officer
Mobile Phone
Email
S. M.
Chief Technology Officer
Mobile Phone
Email
I. C.
Chief Security Officer
Mobile Phone
Email
C. T.
Chief Of Staff
Mobile Phone
Email
C. H.
Vp Of Integration Strategy
Mobile Phone
Email

Callsign Employee Metrics

100%

50%

2026

2025

Engineering
Operations
Analytics
Consultant
Product Management
Other
Program & Project Management
Supply Chain
Solutions Engineering
Information Technology
Administrative
Research
Information Security

Contact profiles from Callsign

Name

Title

Contact

Location

Last Update

S. G.
Senior People Partner
Mobile Phone
Email
Aug 17, 2026
A. P.
Chief Information Officer
Mobile Phone
Email
Jun 04, 2026
Z. H.
Chairman & Ceo
Mobile Phone
Email
United Kingdom
Aug 16, 2026
S. O.
Chief Revenue Officer
Mobile Phone
Email
United Kingdom, England
Sep 03, 2026
I. C. C.
Chief Security Officer
Mobile Phone
Email
United Kingdom
Aug 27, 2026
G. W.
Chief Financial Officer
Mobile Phone
Email
United Kingdom, England
Apr 08, 2026
S. M.
Chief Technology Officer
Mobile Phone
Email
Ireland
Aug 18, 2026
I. W.
Co-Founder & Chief Operating Officer
Mobile Phone
Email
United Kingdom, England
Aug 29, 2026
E. W.
Senior People Partner
Mobile Phone
Email
United Kingdom, England
Aug 16, 2026
B. V.
Owner
Mobile Phone
Email
UNITED KINGDOM, Middlesex
Oct 31, 2023

Frequently Asked Questions

What is Callsign known for?

Callsign was founded in 2011 and operates in the Computer and Network Security industry. You can contact Callsign's main corporate office by phone at

+1-571-966-****

. Explore Callsign's company overview page for more information.

What is Callsign's most common email format?

Callsign employees' email format typically follows the pattern of First.Last@callsign.com. Trying to find reliable and up-to-date employee contact data? Find more Callsign email formats with LeadIQ.

How many employees does Callsign have currently?

Callsign has approximately 278 employees as of August 2026. These team members are located across 4 continents, including Europe, Asia and North America.

Who are Callsign's key employees and leadership?

As of August 2026, Callsign's key employees include:

Chief Information Officer: A. P.
Chief Revenue Officer: S. O.
Chief Security Officer: I. C. C.
Chief Financial Officer: G. W.
Chief Technology Officer: S. M.

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Callsign Employee Directory

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