Insights

Strong Industry Recognition Callsign has been recognized as a leader in authentication and identity-proofing solutions by Javelin Strategy & Research, highlighting its credibility and leadership position in the digital trust market. This recognition can be leveraged to attract larger financial institutions seeking proven security partners.

Strategic Partnerships The company's recent collaboration with Visa International and partnerships with firms like SpecTrust and Infocentric demonstrate its expanding footprint in financial services and fraud prevention markets, creating opportunities to approach similar organizations seeking advanced identity verification solutions.

Expanding Customer Base Callsign’s diverse client engagements—ranging from global pro bono initiatives with The Knoble to fintech collaborations—indicate a broad appeal across sectors, offering potential sales opportunities within nonprofit organizations, financial institutions, and fintech providers seeking reliable digital trust solutions.

Innovative Technology Offering With proprietary, AI-driven user recognition technology delivering 99.999% accuracy and recent product launches like Dynamic Interventions, Callsign provides cutting-edge solutions that can address enterprise needs for seamless, frictionless user authentication and fraud prevention.

Growth and Market Potential With estimated revenue between 25 to 50 million USD and a team of up to 500 employees, Callsign is positioned for further market expansion, especially in regions and verticals prioritizing privacy, security, and customer experience, presenting lucrative sales opportunities for security-focused solution providers.

Callsign Tech Stack

Callsign uses 8 technology products and services including Hotjar, PostgreSQL, Kubernetes Operations, and more. Explore Callsign's tech stack below.

  • Hotjar
    Analytics
  • PostgreSQL
    Database
  • Kubernetes Operations
    Deployment
  • tcpdump
    Network Management
  • macOS
    Operating Systems & Computing Languages
  • Kotlin
    Programming Languages
  • Android
    Programming Languages
  • RabbitMQ
    Software Framework

Media & News

Callsign's Email Address Formats

Callsign uses at least 1 format(s):
Callsign Email FormatsExamplePercentage
First.Last@callsign.comJohn.Doe@callsign.com
96%
First.Middle@callsign.comJohn.Michael@callsign.com
3%
First@callsign.comJohn@callsign.com
1%

Frequently Asked Questions

Where is Callsign's headquarters located?

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Callsign's main headquarters is located at London, England GB. The company has employees across 4 continents, including EuropeAsiaNorth America.

What is Callsign's phone number?

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You can contact Callsign's main corporate office by phone at . For more prospecting data, LeadIQ has access to up-to-date and accurate contact information within our platform. Find, capture, and sync contact data to your CRM and sales tools in one click.

What is Callsign's official website and social media links?

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Callsign's official website is callsign.com and has social profiles on LinkedInCrunchbase.

What is Callsign's SIC code NAICS code?

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Callsign's SIC code is 4813 - Telephone Communications, Except Radiotelephone NAICS code is 5415 - Computer Systems Design and Related Services.

How many employees does Callsign have currently?

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As of October 2025, Callsign has approximately 255 employees across 4 continents, including EuropeAsiaNorth America. Key team members include Chief Revenue Officer: L. C.Chief Information Officer: A. P.Chief Revenue Officer: S. O.. Explore Callsign's employee directory with LeadIQ.

What industry does Callsign belong to?

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Callsign operates in the Computer and Network Security industry.

What technology does Callsign use?

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Callsign's tech stack includes HotjarPostgreSQLKubernetes OperationstcpdumpmacOSKotlinAndroidRabbitMQ.

What is Callsign's email format?

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Callsign's email format typically follows the pattern of First.Last@callsign.com. Find more Callsign email formats with LeadIQ.

When was Callsign founded?

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Callsign was founded in 2011.
Callsign

Callsign

Computer and Network SecurityEngland, United Kingdom201-500 Employees

Callsign is pioneering digital trust through proprietary technology that uniquely mimics the way humans identify each other in the real world. 

Positive identification of genuine users delivers privacy, safety and minimal friction whilst ensuring that bad actors are blocked. Through a simple Swipe or Type, users can be personally recognized to a 99.999% accuracy, delivering the highest fidelity AI based user recognition for the digital world.

Section iconCompany Overview

Headquarters
London, England GB
Phone number
SIC Code
4813 - Telephone Communications, Except Radiotelephone
NAICS Code
5415 - Computer Systems Design and Related Services
Founded
2011
Employees
201-500

Section iconFunding & Financials

  • $25M$50M

    Callsign's revenue is estimated to be in the range of $25M$50M

Section iconFunding & Financials

  • $25M$50M

    Callsign's revenue is estimated to be in the range of $25M$50M

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