Innovate, Secure, & Lead with Top CTOs & CISOs

The 403 Circle brings together CTOs and CISOs to have candid conversations & share learnings because Engineering Leaders need more than just stackoverflow to solve their problems.

Here’s why you’ll love The 403 Circle

An Invite-Only Space
A dedicated Slack group designed for vetted and committed CTOs/CISOs to connect and share ideas.
Build Connections
Curated 1:1 introduction with fellow members to connect and share ideas.
Curated Discussions
A variety of channels for discussions on topics ranging from Security 101, Compliance, Engineering Team Structures, to Cyberattacks.
Exclusive Events
Exclusive events like expert-led AMAs, webinars, and IRL events.


Weekly Curated Insights
Stay updated with the latest cybersecurity and engineering insights, delivered straight to your inbox every week.
Join the community

Membership criteria

You can apply to join The 403 Circle’s online community if you meet the following criteria

  • You are a CTO, CISO, head of engineering, or in a similar role at a product-first company.
  • Your LinkedIn or social media profile indicates that you are the company's CTO, CISO, or a senior engineering leader.
  • Your company website has a working product and is out of stealth mode.

We’ve got simple community guidelines to keep the mix high quality

Be Respectful

Treat everyone with kindness. Communicate in a way you’d appreciate, fostering a welcoming space for all.

No Selling

The 403 Circle is for learning, not sales. No promotion of products, surveys, or offering of resources that require sign-ups in public or private messages.

Keep it Confidential

This space is for CTOs and CISOs to share openly. Keep discussions within the community.

Participate Actively

The community’s value depends on your engagement. Ask questions, join discussions, and post in the proper channels.

Shape the Dialogue

Your insights and mentorship make this space thrive. Contribute to creating meaningful conversations.

Sign up today
FAQs

Frequently asked questions

Who is this community for?

This community is for CTOs and CISOs looking to build, scale, and grow together. By joining the community, you can expect to be part of an online space where you can connect with fellow CTOs and CISOs.

I applied — how long will it take for my application to get approved?

Applications are reviewed by The 403 Circle Community team every weekday.

Why has my application been denied?

Please double-check our criteria to ensure your application meets all the requirements. We have strict criteria to ensure our community folks are of only CTOs and CISOs eager to build, grow, and learn together.