John Decorte

Fullstack & Security Engineer crafting resilient, real-time systems — from startups to scale. Bug bounty hunter & CTF enthusiast.

PORTFOLIO

Discover what I've created

Each piece reflects my passion for innovation and commitment to delivering high-quality results. Feel free to explore and get inspired!

/02

Get Next Line (GNL)

Implemented the get_next_line function to read files line by line with efficient buffer management.

/03

Minishell in C

Recreated a Unix-like shell with pipelines, redirections, environment expansion, and built-in commands.

/01

Web server in C++

Implemented a standards-compliant HTTP/1.1 server in C++ featuring non-blocking I/O, request parsing, routing, and CGI execution. Built a flexible configuration system for virtual hosts, custom error pages, and limits, then validated behavior against real browser and benchmark clients. Hardened the server with timeouts, error handling, and protocol edge-case tests to ensure reliable responses under load.

My Open Source Journey

Each green square represents a day of contribution, a step towards better software for everyone.

Latest write ups

Published on
September 10, 2025
BGP at Doors of Autonomous Systems Is Simple
bgp evpn vxlan networking gns3 docker
Build VXLAN tunnels and a BGP EVPN control plane in GNS3, the same data center networking techniques major cloud providers run in production.
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Published on
March 20, 2025
AWS Cloud Practitioner (CLF-C02) Cheat Sheet
AWS Cloud-Practitioner Certification Cheat-Sheet Exam-Guide
Quick reference guide for passing the AWS Certified Cloud Practitioner (CLF-C02) exam with all essential concepts, services, and exam tips.
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