About MeAvailable for part-time & freelance work
Portrait of Joseph Sfeir

Joseph Sfeir.

Full-Stack Software Engineer · Simly

I'm a full-stack software engineer at Simly, where I build the systems behind its eSIM business: a pipeline that ingests usage records from five eSIM providers and turns them into cost, margin and usage analytics, a rebuilt customer-care platform, and a real-time sync of WhatsApp support chats over webhooks and GraphQL. I'm also studying Computer & Communications Engineering at Antonine University in Lebanon. Most of my work is in Java and Spring Boot on the backend and React on the frontend.

5Projects
11Technologies
2Live deploys
> cd ~/skills
Current toolbox

Skills, with the receipts

Each one counts the projects that actually use it. Open a skill to see them, and the build log below highlights the same set.

> cd ~/projects
Build log

Selected systems

Screenshot of Job Portal
2025

Job Portal

Auth, listings and documented endpoints, on Spring Boot.

A job portal built on Spring Boot with MongoDB behind it. It handles user authentication, job listings and the full application lifecycle, with the REST layer documented in Swagger and the codebase in JavaDoc.

  • Java
  • Spring Boot
  • MongoDB
  • Swagger
Screenshot of Election Analysis & Prediction
2025

Election Analysis & Prediction

Municipal results, turned into a forecast.

Analysis of Lebanon's latest municipal election results, extended into a forecast for the coming parliamentary race using the Lebanese Forces as a worked example. Built in Python, with plotting and prediction libraries doing the modelling.

  • Python
  • Data Viz
  • Prediction
Screenshot of Sports Analysis App
2025

Sports Analysis App

Scraped stats, scored to settle the GOAT argument.

Scrapes player statistics from basketball and football sources, then scores them against each other to settle the GOAT argument with numbers rather than opinions. Python end to end, with the results rendered out to HTML and CSS.

  • Python
  • Web Scraping
  • HTML/CSS
Screenshot of AgriCrop
2024

AgriCrop

A farm marketplace where the tutorials sit next to the products.

A farming marketplace that keeps the products and the how-to content in the same place: a browsable catalogue of farming supplies alongside tutorials on the techniques they are used for.

  • JavaScript
  • HTML/CSS
Screenshot of Jarvis E-Com
2024

Jarvis E-Com

A storefront taken from empty folder to deployed.

A storefront built end to end: landing page, full product catalogue, and individual product views. One of the first larger builds I took all the way from an empty folder to a deployed site.

  • JavaScript
  • HTML/CSS

Also built

> cd ~/services
Services

What I can build

Web Design

I offer services in web design, drawing from my experience in web development. I can assist with designing, implementing, and managing websites to ensure reliable and engaging user experiences tailored to your business needs.

API Implementation

Intermediate in API development, I design and implement robust APIs, mainly using Postman, that facilitate seamless communication between applications.

Backend Development

I build the server side of an application: authentication, data models, and the endpoints your frontend talks to. Most of my backend work is in Java with Spring Boot, backed by MongoDB or a SQL database.

Database Implementation

Intermediate in database development, proficient in designing and implementing databases, such as MongoDB, MySQL and PostgreSQL, that ensure efficient data storage and retrieval for your applications.

Java Development

Professional in Java development, I've specialized in creating robust applications using Java, from Minecraft plugins to complex backend systems.

SQL Development

Intermediate in SQL development, using PL/SQL to create efficient and scalable database solutions. I can help you design, implement, and optimize SQL databases for your applications.

> cd ~/contact