Founded in 2024 by 8200 alumni Matan Bar-Efrat and Netanel Rubin, Rein Security builds a unified platform that brings real-time, runtime visibility to application security operations. The technology overlays application runtime context to distinguish validated risks in production from theoretical vulnerabilities, allowing security teams to prioritize remediation on issues that actually reach exploitable code paths. Key use cases include API security and software composition analysis (SCA) reachability, helping organizations understand which APIs and libraries are active in live environments and whether known vulnerabilities are truly reachable. By replacing assumption-based defenses with fact-based insights, the company aims to give CISOs comprehensive protection of every application, microservice, library and API without disrupting production. Rein operates out of Tel Aviv and New York and currently employs roughly 23 people. The startup positions itself at the intersection of AppSec and AI security, targeting enterprises that struggle with sprawling cloud-native application stacks.

Total raised

$8M

Funding rounds

1

Latest round

Seed

Latest activity

Jan 2026