Defguard

Defguard is a Warsaw-based open-source cybersecurity company building the only enterprise VPN platform that embeds multi-factor authentication natively at the WireGuard protocol level, closing the gap between network access and identity that standard WireGuard deployments leave open. The fully self-hosted platform unifies VPN connectivity, identity and access management, SSO (Google Workspace, Microsoft Entra ID, Okta, LDAP, Active Directory), firewall policy orchestration and SIEM integration in a single Rust-built stack that customers run entirely on their own infrastructure — with no third-party cloud dependency and no US CLOUD Act exposure, supporting GDPR, NIS2, HIPAA and ISO 27001 compliance.

Defguard spun out of teonite, a Polish software venture builder co-founded by CEO Robert Olejnik, and was publicly released on GitHub in May 2023 under an AGPL licence; its open-source core has gathered around 2,700 GitHub stars, with enterprise features under a commercial licence. In May 2025 it raised €1.2M (PLN 5.2M) in a pre-seed round led by Polish VC Hard2beat, with SMOK Ventures, S20 Team and cybersecurity firm ISEC, plus angels including Łukasz Jesis (Xopero). Version 2.0, released in April 2026, re-architected the platform with high availability and built-in SSL termination.