joaomarcuslf/leet-discuss
Archive LeetCode Challenges
Hi, I'm João Marcus Fernandes
Staff Software Engineer | Back-end Specialist
Tech Lead | Cloud Computing | Go / Golang | Node.js | MongoDB
I’m a passionate software engineer since 2014, I have experience building scalable and efficient systems. I’ve had the opportunity to work with companies across the globe, including Brazil, North America, Europe, and Asia, gaining a deep understanding of diverse tech ecosystems.
I specialize in Back-end development, with a strong focus on Go (Golang) and Node.js, and have extensive experience designing and optimizing cloud-native architectures using AWS and GCP. My expertise also includes working with MongoDB for database solutions and leveraging modern technologies like JavaScript/TypeScript (React.js, Next.js, Vue.js), Python, and Ruby (Ruby on Rails, Sinatra) to deliver robust, high-performance applications.
Whether it’s leading technical teams, architecting scalable systems, or mentoring developers, I’m driven by the challenge of solving complex problems and delivering impactful solutions.
Want to know more? Check out my About Me page!
Work Experience
Highlighted Skills
JavaScript
MongoDB
Agile
Architecture
Cloud Providers
Communication
Leadership
Highlighted Posts

Dicas de um Entrevistador Técnico
PT
How to Use My Dotfiles
EN
Como usar meu Dotfiles
PT
Data Structure 101: Part 04
EN
Aprendendo a utilizar HTTP
PT
Dicas para conseguir o seu primeiro emprego em TI
PT
Thinking Functional: now with example and cats
EN
Ideias para você começar um Portfólio Dev
PT
Criando seu primeiro site com GitHub Pages
PT
Data Structure 101: Part 03
EN
Data Structure 101: Part 02
EN
O Triângulo invertido do Front-end - TDC
PT
Teaser - Front-end in TDC - The Developer’s Conference
PT
Data Structure 101: Part 01
EN
Front-end in 2020 - Presentation
PT
Refletindo sobre mulheres na computação e comunidades tóxicas
PT
Testando JavaScript corretamente com Mocha + ES6 + Gulp
PT
How moving from Design to Back-end made me a better Front-end
ENHighlighted Projects
joaomarcuslf/gardevoir-ex-damage-calculator
Automatic Damage Calculator
joaomarcuslf/gas_sensor_iot
Gas Sensor IoT
joaomarcuslf/pico_reaction_game
Pico Reaction Game
joaomarcuslf/code-challenges
Code Challenges
joaomarcuslf/sucellus
Docker Cloud Provider
joaomarcuslf/color-generator
Color Generator API
joaomarcuslf/qr-generator
QR Generator API
joaomarcuslf/keyforge-name-of-the-day
This is my take on Twitter bot with Go.
joaomarcuslf/ticket-creator
This is a service that creates Tickets to be shared for others.
joaomarcuslf/workspace-configs
My default settings for most of my projects
arctouch/web-tests-factory
Tests Factory for most of the Web Frameworks
joaomarcuslf/go-go-url-go
This is and URL shortener repo written in Go, using Redis and Docker.
joaomarcuslf/grpc-golang-example
POC using gRPC to learn
joaomarcuslf/docker-golang-api-template
POC using gRPC to learn
joaomarcuslf/auth-blog-service
RestAPI, using JWT and Auth by Role
joaomarcuslf/mentorship
This project contains the codes used for the mentorship I'm giving
joaomarcuslf/textual-emotion-detect
POC of how to detect text emotions.
joaomarcuslf/python-advanced-studies
An repository for my studies in Python.
joaomarcuslf/react-graphql-country-list
An application built with React, and Redux. Consuming GraphQL Api.
joaomarcuslf/react-flask-application
An application built with React, Flask, Postgres and Docker.
joaomarcuslf/web-gongyo
A place to pray.
joaomarcuslf/mtg-csv-generator
This repo will show some of my data-science studies using MTG cardbase
joaomarcuslf/data-science-studies
Repo to show how my studies about data science are going
joaomarcuslf/sabaki-i18n
My contributions to Sabaki i18n
joaomarcuslf/react-express-ssr
SSR example using React and ExpressJS
joaomarcuslf/golang-studies
Repo to show how my studies about Golang are going
joaomarcuslf/react-goban
Migrated Goban component to modern React
joaomarcuslf/pbl-tcc-bucket
This is the AWS Bucket API for the PBL project
joaomarcuslf/pbl-tcc-front
This is the Front-end built in VueJS for the PBL project
joaomarcuslf/pbl-tcc-api
This is the Rest Api Back-end built in Ruby on Rails and PostgreSQL for the PBL project
joaomarcuslf/cross-event
Module for Event communication for React Native, Node and Browser
joaomarcuslf/rasp-monitor-bot
Clojure Bot for Raspberry Pi
joaomarcuslf/authorization-api
JWT Api Authorization built in several languages
joaomarcuslf/clojure-catalog-service
Example of a catalog api built in Clojure
joaomarcuslf/clojure-rest-api
Clojure REST API