Arcjet, a developer-first security platform, has raised $8.3 million in Series A funding, bringing its total capital to $12 million, to accelerate the deployment of its in-code security technology designed to counter the rise of AI-powered cyberattacks and malicious bots.

The funding round was led by Plural and Ott Kaukver, the former CTO of Twilio and Checkout.com. Additional participation came from existing investors Andreessen Horowitz and Seedcamp, alongside new investors Jeff Lawson and Feross Aboukhadijeh.

Arcjet’s technology provides AI-powered security tools that enable developers to detect and block threats directly within their codebase, moving defenses away from the traditional network edge. This method aims to defend against malicious bots, automated fraud, and scraping attacks that conventional perimeter-based tools may not identify.

David Mytton, founder and CEO of Arcjet, stated that legacy security tools, which were designed for a pre-AI era and operate at the network perimeter, often lack user or business context. According to Mytton, these tools cannot provide the granular protection needed to differentiate valuable AI traffic from genuine threats or respond at the pace of AI innovation. This can lead to security approaches that lack application and business context, potentially slowing release cycles, generating false positives, and missing sophisticated attacks.

Sten Tamkivi, a partner at Plural, commented on David Mytton’s background, noting his deep technical expertise and understanding of developers’ needs. Tamkivi highlighted Arcjet’s rapid traction and credibility, with thousands of live websites reportedly trusting the platform to protect against significant threats. He added that Plural supports founders who demonstrate pace and conviction, characteristics observed in Mytton and his team.