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Callsign

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Delivering digital trust through simple secure customer interactions Enterprise Software Cybersecurity Artificial Intelligence

About Callsign

Callsign builds in the enterprise software category and is tracked by 100Xfounder for operating momentum, talent growth, and market execution.

What they do: Delivering digital trust through simple secure customer interactions Enterprise Software Cybersecurity Artificial Intelligence

Funding context: Accel, $39M Series A in 2020

Recent milestones:

Callsign appears in the 100Xfounder startup directory import feed.

Why it Matters

Callsign matters because delivering digital trust through simple secure customer interactions Enterprise Software Cybersecurity Artificial Intelligence

Funding Snapshot

Total Funding: $39.00MLast Round: Series A Accel, $39M Series A in 2020All Rounds: 1

Series A | Accel, $39M Series A in 2020

Hiring Roles

This company is actively hiring.

Open Roles

Meet the Founders

Callsign Team

Callsign Team

Founder & CEO

Tech Stack

AWSReactPythonPostgreSQL

Last updated: April 17, 2026

Callsign intelligence brief

This profile combines core company context with linked founder, funding, and newsroom routes so readers can evaluate business momentum without switching across multiple tools. Use it as a baseline for comparing peers in the same industry and stage.

For deeper validation, pair this page with founder profile, company news coverage, and stage-based funding hubs to contextualize updates against wider market movement.

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Discover Now

Newsroom and topic pages connected to Callsign.

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Contextual Research Links

Jump to country, industry, stage, startup taxonomy, and newsroom routes tied to this company.

Company profile→Company news hub→Founder profile→United Kingdom startup directory→United Kingdom startup news→Enterprise Software hub→Enterprise Software startup list→Series A startups→Series A startup list→Series A newsroom→

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FAQs About Callsign

Common questions people ask about this profile.

What is Callsign?

Delivering digital trust through simple secure customer interactions Enterprise Software Cybersecurity Artificial Intelligence

Who founded Callsign?

Callsign is associated with Callsign Team on 100Xfounder.

Where is Callsign located?

Callsign is listed in London, England, United Kingdom.

What stage is Callsign in?

Callsign is currently mapped to Series A. Funding context: Accel, $39M Series A in 2020

What is the latest funding round of Callsign?

Callsign's latest tracked round is Series A Accel, $39M Series A in 2020. Total tracked rounds: 1.

Is Callsign hiring now?

Callsign hiring status: Open Roles.

What technologies does Callsign use?

Callsign is associated with AWS, React, Python, and PostgreSQL.

Is Callsign verified on 100Xfounder?

Yes. Callsign is currently marked verified on 100Xfounder as of April 17, 2026.

How can users connect with Callsign founders?

Users can open founder profiles, use listed company links, and track signal updates directly from the 100Xfounder directory.