Esteban MATHIA

Design and overhaul of the company's central information system, moving from a monolithic system that was poorly integrated with business requirements to a unified, event-driven infrastructure designed to meet the needs of both the sales team and the factory.

I led the urbanization and platformization effort, redesigning how data flows across departments and guaranteeing consistency throughout the full data lifecycle, from event creation to downstream consumption.

Design and development of a client-facing extranet giving customers real-time visibility into their orders, quotes and support requests, replacing a process that previously relied entirely on phone calls and emails to get a status update.

I led the development end-to-end, from data model to frontend, including the statistics dashboard and the support (SAV) workflow. Daily active usage grew to 700 users, a 700% increase in under a year.

A personal finance platform that runs at home instead of in someone else's cloud: a Node.js/TypeScript REST API on SQLite, a React + Vite web app served by the same server, and an Expo (React Native) mobile app with its own local SQLite database, so it keeps working without any connection.

Synchronization relies on a server-side change journal, client-generated UUIDs and last-writer-wins conflict resolution, shared by the three apps through a common TypeScript package. The phone is paired by scanning a one-time QR token.

Features include PDF bank statement import, receipts (photos and PDF, compressed on the device), recurring expenses, monthly budgets and on-device analytics: end-of-month projection, deviation from your usual months and subscription detection. It ships with Docker Compose, automated backups with retention, JWT authentication and rate limiting.

Development and deployment of Kexa, an innovative open-source solution simplifying compliance management on multi-cloud platforms (Azure, Google Cloud, AWS, etc.). Thanks to intuitive, customizable rules, Kexa enables even non-experts to ensure the security of cloud environments, while guaranteeing near real-time monitoring and instant alerts in the event of non-compliance.

This open-source project that I initiated respects the OpenSSF development standards. I worked on all the different aspects of the project, from design to production.

Over the course of more than 24 months of daily commitment (and continuing to this day) to CodinGame, a competitive programming platform, I reached a best rank of 36th in the world among millions of developers, ranking among the "Grand Masters". My journey began with no specific goal in mind, but the challenges of fighting bots quickly captured my interest.

By accumulating 11 legend leagues and several gold leagues, I honed my skills in code optimization and complex problem solving. This constant work, combined with the use of several programming languages (Python, TypeScript, C++, Rust), has enabled me to push back my limits and rank among the world's top developers.

Lately I have been tackling optimization puzzles in C++, such as capacitated vehicle routing (CVRP), Number Shifting, SameGame and Bender 4. I'm still actively involved in the CodinGame community, taking part in challenges and helping to approve new content.

This project is a personal challenge to deepen my understanding of network programming and distributed systems. The client will support the main features of the BitTorrent protocol, including file downloading, uploading, and DHT for peer discovery. The use of Rust allows me to take advantage of its performance and safety features, particularly in terms of memory management and concurrency. A project that allows me to immerse myself in network programming and distributed systems while emancipating myself from industry-standard solutions.

As Lead Technician, I led the development of a solution to carry out feasibility studies for new solar panel supports in a B2B context, complementing the company's existing range to penetrate new international markets. The aim of this project was to meet growing demand by optimizing the commercial approach.

To achieve this, I designed an intuitive web application enabling users to quickly create projects, analyze the site environment, draw roof sketches and select suitable components. The tool produces detailed reports, parts lists and quotations to facilitate the management of solar installations. It turns a design office study that could take several days into a few minutes of work.

The aim of TheCloudPrices project was to inventory the prices of cloud services from the three main providers: Azure, AWS, and GCP. To achieve this, I set up microservices dedicated to data scraping, resource benchmarking and information processing to feed our databases in an automated way.

This website served as a decision support and FinOps management tool, enabling companies to optimize their cloud spending. Thanks to our solution, our users were able to achieve savings of 50-70% on the cost of virtual machines, while maintaining and even improving performance.