In an era where artificial intelligence can perfectly mimic any voice and face, the human element has become both our greatest vulnerability and our final frontier of defense.
Our Mission
At Callstrike, we're redefining cybersecurity around its most unpredictable element, people.
For years, enterprise security has focused on hardening code, applications, and networks. Now, AI is reshaping that landscape entirely, not just transforming defenses, but giving attackers new capabilities.
Voice cloning, deepfake video calls, and AI-driven social engineering have made deception faster, smarter, and harder to detect. AI now enables attackers to mimic leaders, colleagues, and customers with unprecedented realism, shifting the threat landscape from infrastructure to perception.
Callstrike prepares the workforce for this new reality. Through immersive deepfake simulations and real-world training, we help teams recognize and respond to threats technology alone can't stop. Because when anyone can be impersonated, human judgment becomes your most critical defense.
Gyan Chawdhary is the Founder and Chief Product Officer of Callstrike. He previously founded and served as CEO of Codebashing, an interactive security training platform for developers, which scaled to customers like Microsoft, NYSE, and Fitbit before being acquired by Checkmarx.
He later founded Kontra Application Security Training, adopted by companies including Snapchat, PayPal, SoundCloud, and Box. Under his leadership, Kontra partnered with KnowBe4, providing developer-focused security training to over 60,000 KnowBe4 customers. Kontra was successfully acquired by ThriveDX and later spun off to Security Compass.
Gyan Chawdhary has spoken at Black Hat and held leadership roles at RBS and IHS Markit (now S&P Global).
Ready to Prepare Your Team?
Don’t wait for the first attack. Start training your organization to recognize and
respond to deepfake enabled social engineering today.
Callstrike Ltd
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London, United Kingdom,
WC2H 9JQ
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