Arnaud Deville

Software engineer

3E

3E

Web application

3e

Overview

3e is a platform that reimagines the monetary system by turning gold into a productive asset. Designed with clarity and purpose, the application balances financial innovation with user-friendly design.

With inflation increasing in many parts of the world, 3e gives people a way to protect their money. Instead of keeping gold in a vault, the platform helps users earn money from it, while still using it to buy things online.

The system is complete: investors can grow their wealth with gold, and regular users can pay for goods and services. The website clearly shows these two sides, making it easy for anyone to explore the platform and understand how it works.

Tech Stack

Typescript

Programming language

Node

Javascript engine

HTMX

Framework

SQLite

Database

Created

2020

Features

I contributed to the development of a fintech application that supports peer-to-peer transfers, QR code payments, and related services such as a real estate platform, a marketplace, a donation tool, and a WordPress plugin. The project includes over 100,000 lines of code, developed with performance, usability, and security in mind.

The backend was built from scratch using Node.js, with multiple payment gateway integrations including Fintecture, Stripe, GoCardless, and Wise. End-to-end encryption was implemented to ensure secure data exchanges. The VAPID and S3 protocols were also developed entirely from scratch—this avoided adding heavy external dependencies and represented a significant amount of custom work.

The frontend was initially built with React, then transitioned to HTMX, which allowed the team to maintain and scale a large codebase efficiently with limited resources.