We are a team of security researchers, ethical hackers, and consultants dedicated to making the digital world safer.
Founded in 2009 by Sarah Chen, 21st Century Digital Security started with a simple mission: make enterprise-grade cybersecurity accessible to organizations of every size.
What began as a two-person penetration testing consultancy in San Francisco has grown into a full-service cybersecurity firm with over 80 security professionals serving clients across North America, Europe, and the Asia-Pacific region.
Over the past 15 years, we have conducted thousands of security assessments, responded to hundreds of incidents, and helped organizations across healthcare, finance, technology, and government build resilient security programs from the ground up.
Today, 21CDS is recognized as a trusted partner by Fortune 500 companies and high-growth startups alike. Our approach combines deep technical expertise with strategic thinking to deliver security outcomes that align with business objectives.
Our leadership brings decades of combined experience from the front lines of cybersecurity.
Former NSA analyst with 18+ years in offensive security. CISSP, OSCP certified. Built 21CDS from the ground up into an industry-recognized firm.
Ex-Google security engineer specializing in cloud infrastructure and DevSecOps. Leads our R&D and tooling development initiatives.
OSCE3, OSEP certified. 12 years of experience in red team operations. Has led engagements for Fortune 100 financial institutions.
Published vulnerability researcher with 30+ CVEs. Leads our threat intelligence and zero-day research programs. Regular DEF CON speaker.
The principles that guide every engagement and every line of code we write.
We constantly push the boundaries of offensive and defensive security research to stay ahead of evolving threats.
Trust is the foundation of our business. We operate with full transparency and adhere to the highest ethical standards.
We hold ourselves to the highest technical standards. Every assessment, report, and recommendation reflects our commitment to quality.
Security is a team effort. We work closely with our clients and actively contribute to the broader security community.
Our team holds the most respected certifications in the cybersecurity industry.
We are proud to partner with Fortune 500 companies, government agencies, and innovative startups across every industry.