Douglas Mendez
Latest published
Cracking the Login: Encryption Layers, Domain Modeling, and Sessions in Rust
6 March 2026
I share practical notes on software engineering, focused on systems thinking, Go, Rust, cloud, networking, Linux, and real debugging work.
Personal notes from production lessons and experiments.
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Most viewed posts in the last few days.
Featured post
From Nostalgia to Code: Building a MU Online Server in Rust
Driven by nostalgia for MU Online, we use OpenMU as a reference to build a server from scratch in Rust. In this first episode, we decode the binary protocol, understand packet framing and encryption, explore the ConnectServer/GameServer architecture, and implement just enough to see the legendary login screen appear.
18 February 2026 • 29 min
Featured post
Harnessing eBPF and XDP for DDoS Mitigation: A Rust Adventure with rust-aya
DDoS Mitigation with XDP and Rust: Dive into a Rust-based eBPF program for redirecting UDP flood attacks to a honeypot. This hands-on guide demonstrates the potent synergy of XDP and Rust in network security, offering a practical approach to packet manipulation and cybersecurity.
21 November 2023 • 26 min
Featured post
Networking and Sockets: Endianness
This article explores the concept of endianness in computer systems, focusing on how different byte orders (little-endian and big-endian) affect data interpretation in network communication. Through practical examples using Rust, we demonstrate the importance of handling endianness correctly when sending and receiving data between clients and servers.
14 June 2024 • 17 min
Connected writing
Collections of related posts when you want to go deeper on one topic.
Highlighted collectionMy eBPF Journey
Dive into "My eBPF Journey," a series that narrates the exploration of eBPF programming, starting from the basics and gradually advancing to more complex applications.
My Socket Learning Adventure
Join me on my humble journey of socket discovery in Linux with the "My Socket Learning Adventure" series. Together, we'll explore the world of Unix sockets,
Rust 101
Welcome to Rust 101! This series covers my exploration of Rust, from basic concepts to more advanced topics. It's not in any particular order — just a collection of things I find interesting or at least interesting enough to write a post or note about. If you're curious about Rust, feel free to jump into any post that catches your eye.
Building a MU Online Server in Rust
A nostalgia fueled deep dive into reverse engineering the MU Online binary protocol, using OpenMU as a reference to build a working game server from scratch in Rust.