How Killswitch Uses Paraxial.io to Protect Client Estates

Killswitch gives families peace of mind. Users upload their most important documents like wills, insurance policies, property records, and account credentials, designate beneficiaries, and set a check-in schedule. If they ever miss one, the right people automatically get secure access to exactly what they need. No lawyers, no probate delays, no scrambling during the hardest moments. It’s the kind of protection that used to require expensive estate planning.

That promise comes with an unusually high security bar. Being trusted with someone’s most sensitive documents means a breach isn’t just a data incident, it’s a potential catastrophe for real families. Founder Jacob Luetzow built Killswitch on a zero-knowledge architecture: files are encrypted in the browser before upload using AES-256-GCM, with keys derived from the user’s password. The server never sees plaintext. But zero-knowledge encryption doesn’t protect against credential stuffing, SQL injection, or code execution payloads hitting the app in production, which is where Paraxial.io comes in.

Paraxial.io handles the threats that good code alone can’t stop. Bots probing for account credentials get blocked before they can compromise a single user. Automated scanners looking for vulnerabilities get banned on first contact. Attackers attempting to brute-force their way into sensitive documents hit rate limits and are locked out automatically. Any attempt to inject malicious code through request parameters is detected and banned instantly. And every code change is scanned before it ships, so vulnerabilities never quietly make it into production.

Jacob uses Claude Code to accelerate development, and is clear about where AI assistance ends and human judgment begins.

“I use Claude Code as part of my workflow, it speeds things up, but I’m the one designing the system, making security decisions, and reviewing everything before it ships. The zero-knowledge architecture, the defense-in-depth approach, how I’m using Paraxial, that’s all me.”

Paraxial.io closes the gap between code that looks secure and code that survives real world attack traffic.

“I can move fast with AI tooling while Paraxial catches things in CI and hardens the app at runtime. Layered security makes sense when people are trusting you with their most sensitive documents.”

Jacob Luetzow, Founder, Killswitch

Paraxial.io stops data breaches by helping developers ship secure applications. Get a demo or start for free.