A Japanese, more code-heavy version of this is on Zenn . I build RoamSwitch , a solo-developed network security app for Mac and Linux. It locks down the firewall and shared services the instant you're on a network you haven't approved, and on Pro it adds things like emergency network isolation when it sees ransomware-like behavior, and DNS-layer blocking of phishing/C2 domains. For the last few releases I'd been building two fairly unglamorous features, a log auditor that flags frequenc...