About Atsign
Atsign helps teams build systems where people, applications, devices, services, and AI agents can communicate with verified identity, end-to-end encryption, and no public network attack surface.
// Defense by design
The internet was designed to be open. Connectivity came first, and individual organizations were left to defend themselves. Today, teams try to protect their complex digital networks by stacking complex, bolt-on security controls on top of that open foundation. It's not working.
Atsign offers a different approach. We provide the missing layer that allows all of these entities to connect and collaborate with the very best defense of all: no public network attack surface.
// Deep technical heritage. Built for the future.
Atsign brings together a focused, elite team with decades of specialized experience across networking, cybersecurity, cloud, and open source. We've spent our careers solving the internet's toughest connectivity and security challenges.
Where our team has engineered the past:
Security & Infrastructure:
Akamai • Palo Alto Networks • F5 • Juniper Networks • Cohesive Networks • Google Cloud
Enterprise & Telco:
British Telecom • DXC Technology
Global Finance:
Credit Suisse • Deutsche Bank • UBS
// Our team
The human element of the tech
While true end-to-end encryption relies on unique keys to guarantee cryptographic trust, the platform is only as strong as its architects. Our technology represents half of the equation — the collective enterprise security experience of the people behind it completes it.
// Executive team
Aparna Rayasam
CEO
Aparna Rayasam is the Chief Executive Officer of Atsign, where she leads the company’s mission to deliver foundational security and governance for the emerging era of agentic AI. With over 28 years of leadership experience at top-tier technology companies, including Akamai, Palo Alto Networks, and F5, Aparna is a recognized specialist in product-led transformation and enterprise revenue scaling. She has a proven history of growing early-stage security portfolios into multi-billion-dollar market leaders, with deep expertise in product strategy, platform architecture, and threat research.
Colin Constable
CTO & Co-founder
Colin Constable is the CTO and co-founder of Atsign, a company building the next generation of Internet technology with simplicity, security, and privacy built in. He is a technologist with 40 years of experience in the telecommunications and internet industries. Colin’s credits include his career at British Telecom, CTO at Credit Suisse Bank, then heading to Silicon Valley for strategy work at Juniper Networks and co-founding Deutsche Bank Labs. Colin is passionate about privacy and security, and he believes that Atsign can help to create a more open and decentralized internet.
// Core team
Jack Bradley
CFO
Gary Casey
Engineer
Curtly Critchlow
Flutter Developer
Kim Dimick
Advisor
Lilian Gardon
Student Engineer
Scott Hetherington
Marketer
Ashish Khanna
Senior Developer
Narendra Kumar
Software Developer
Xavier Lin
Software Developer
Olha Lytovchenko
UX Designer
Daria Margarit
Product Designer
Tinashe Mawoyo
Product Experience
Jen Monroe
Maketing Generalist
Kim Santy
Operations
Sherrill Saxer
HR & Accounting
Mike Silvey
Go-to-Market
Chris Swan
Engineer
Srie Teja
Software Developer
Rocky Tilney
Creative
Jeremy Tubongbanua
Software Engineer
Chris Whalen
Sales Advisor
Don Witt
Sales Advisor
// Our board
Dr. Henna Karna
Board Member
Kim Perdikou
Board Chair
Aparna Rayasam
CEO
Colin Constable
CTO & Co-founder
// Proof
Just as our technology requires verification before any connection is made, we hold our platform to the same uncompromising standard. We do not ask for implicit trust. We verify it through open source transparency, rigorous testing, and real-world results.
Industry recognition.
Award-winning solutions recognized for innovation in secure networking, including TMCnet AI Agent Product of the Year, IntellyX Digital Innovator 2026, and Finalist for Most Innovative AI-Infrastructure Security Solution in SiliconANGLE Media's 2026 Tech Innovation CUBEd Awards.
Open source credibility.
A transparent protocol and platform built on community-driven trust and verifiable code.
View our OpenSSF scorecard// Customer testimonials
“Without AI Architect, I don't think I would have been able to make this at all… To be able to incorporate the AI agent and automated workflow while maintaining security is everything.”
Jen
Founder
“With Atsign, you don't have to worry about the vast majority of that plumbing. It allows, especially in the age of agent coding, for you to not have to worry so much about things like encryption, data-layer security, and communication security.”
Rick Deacon
18-Year Cybersecurity Professional and Head of Platform
“If you are a CISO or run infrastructure you should take a look at this.”
Andy Brown
CEO, Sand Hill East
“I'm a convert. It's brilliant!”
Jeremy Norris
Product Manager, Cellusys & ZARIOT
