Zoe Leullier

Full-stack developer building thoughtful software

I'm Zoe Leullier, a full-stack developer based in São Paulo. I care about clean architecture, accessible interfaces, and shipping fast. When I'm not coding I'm writing about what I learn.

São Paulo, Brazil

Selected projects

ESPion

A rogue public Wi-Fi hotspot running on an ESP8266: it serves a convincing fake login portal over a captive-portal DNS/DHCP setup to expose how easily credentials leak on open networks.

embedded
esp8266
cpp
security

Code

libft

My first C library from the 42 curriculum — from-scratch reimplementations of libc functions for memory handling, string manipulation, and linked lists.

c
libc
42
low-level

Code

trackapp

Real-time delivery tracking that proxies the Sinclog logistics API with automatic token caching and Cloudflare Turnstile bot protection. Built with Next.js 16, React 19, and Bun.

nextjs
react
bun
typescript

Code

Notes and writing

I write about what I'm building and what I'm learning.

Read the blog

Contact me

Have a question or want to work together? Send me a message.