Vitalii Zaiats
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Vitalii Zaiats

Software engineer

I build backend systems — APIs, data pipelines, and the infrastructure that keeps them upright.

Here I write up the problems that took me more than a day to solve.

About CV

Pinned

  • 17 million devices for rent: tracing a residential-proxy botnet from one cracked game Jul 12

2026

  • I tried to find a device by the shape of its WiFi. My own null control said no. Jul 12
  • Chaining SOCKS5 UDP relays: self-loops, SSRF, and the amplification that isn't Jun 13
  • Auth on TCP, open on UDP: the SOCKS5 relays scanners can't see Jun 11
  • From a proxy pool's torrents to a booby-trapped game May 31
  • Coordinated disclosure: CCTV cameras selling their owners' bandwidth Apr 15
  • The iOS proxy ghost: why you can't find an iPhone in a residential pool Apr 3
  • TCP-fingerprinting 300K residential proxy IPs: 98% are Linux Mar 26
  • Detecting credential stuffing through encrypted traffic Mar 24
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