Hi, I'm Renan

I started programming many years ago and didn't figure out how to stop yet. I like to keep things simple and small, and to under-engineer solutions to the problems I meet. You can contact me at renan@lecaro.me

Projects

• ciboulette.net : B2B2C Marketing SAAS helping 80 market gardeners sell to 16k clients
• mermaid-gdocs : Google docs addon to make graphs from text. 202K installs
• breakout71 : A rogue-lite version of breakout where you combine upgrades into powerful build
• sms : SMS proxy to let web apps programmatically send SMS from android phones
• txt : An end-to-end encrypted real time collaborative text editor.
• sheets : Collaborative spreadsheet editor using nanosheets as frontend sheet library.
• obm : Text to charts tool written in rust
• fastpen : Client side only codepen alternative
• minimage : PWA to draw on images
• colors : Tiny web app to generate a range of colors
• sqlitezoo : SQLite tutorial
• waco : Text diff tool for whatsapp
• mywords : PWA for Russian vocabulary training.
• importabular : spreadsheet-like data importer component (js, non virtualized, 5kb).
• nanosheets : spreadsheet component (js, virtualized, 2.5KB)
• city-v1 : An experimental multiplayer city builder game
• breakout v1 : Breakout clone with many modifiers that impact difficulty and score at the same time.
• breakout v2 : Breakout clone with only coins to pick up and local split screen multiplayer using phones as remote

Technologies

• HTML/CSS/JS : I've been building for the web since 2009.
• React : Using it since 2016, build countless projects with it. I usually start vanilla and then switch to react if the front end becomes complicated.
• MeteorJS : Using it since 2015 for ciboulette.net
• MongoDB : Using it since 2015. I can write aggregates but I'm not a DBA
• Webpack : Used it on all major projects since 2017
• Nodejs Using it since 2015
• GIT : Every project since 2013
• Linux : Main desktop os since 2013
• Nginx, Docker, Rust, Kotlin, Ruby on rails : still learning and practicing

Work experience

• Weezevent Started in may 2025: We maintain and extend a suit of tools for large events : Ticketing, Access control, Cashless payment, Communication.
• Della AI May 2022 to September 2023 : They have a great product, an in-house AI that looks for answers in legal documents. I helped make the UI lighter, faster and closer to UI standard.
• virtualQ August 2017 - December 2019 : I mostly worked on client facing web UIs in react but sometimes had to touch the rails back-end to get things moving quickly. Created a bunch of MeteorJS based tools for internal use.
• Mille Volts : 6 months in 2016. We built a few solutions for various clients, with react.