Sarthak Kalpasi

Systems & DevOps Engineer

I build backend systems and self-hosted infrastructure. I focus on Linux, networking, low-level kernel performance, and SRE. Everything here runs on a native VPS reverse proxy stack.

Writing

Jun 2026 A Multi-Node k3s Cluster, Load Tested to Saturation Mar 2026 Hiding Downtime Behind a Proxy Mar 2025 Self-Hosting on a Raspberry Pi Feb 2024 Firewalls and NAT on Linux Oct 2023 Encrypting Files and Connections Aug 2023 An IPsec VPN with LibreSwan Apr 2022 A Reverse Shell from an Online Compiler

Projects

JustTalk P2P secure voice/text protocol in Rust & Electron
BitChess Chess engine in C using bitboards & alpha-beta
Userland ACLs Linux access control using extended attributes in C
Encrypted File Copy File encryption utility using OpenSSL & HMAC in C
Authenticated IRC Secure IRC protocol with Needham-Schroeder handshake in C

Contributions

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