andreysergeevich.me JW-1 Rev. Oct 2026

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Now

Updated October 2026. Work only.

Day job. Information security engineer on contract at a healthcare technology company.

Building. Small browser security tools for this site: a subnet calculator, a JWT decoder, hashing and Base64, a password strength estimate, and a response headers check. They all run in the browser and send nothing.

Writing. Field notes on how things here are built and secured. The first one covers the leaderboard.

Open to. Contract work in identity, detection and response, CIS 18, and network hardening. Work with me.

Index of things not on the page

?
This card.
Esc
Close it.
Words
The page listens for a few. Think infantry, think dog, think root.
Codes
One old one. Thirty lives not included.
Paper
Try printing this page.
Files
Security people read security.txt. Closely.