Freelancer profile translated to English.

Description

Have you successfully coded an application that has been validated by the market?

It works, users are there, the business is running… but technical debt is starting to cost you dearly in time, bugs, scalability, and sleepless nights.

This is exactly where I come in.

I am Louis Saglio, a software engineer specializing in heavy refactoring and professional upgrades of applications that were built quickly but now need a truly solid foundation.

What I do concretely:

I take over legacy codebases, often poorly documented, and transform them into maintainable, performant, and scalable applications.

I eliminate technical debt without breaking everything (and especially without rewriting everything from scratch).

I massively optimize performance (example: ×7 on the most used pages of a Django ERP thanks to advanced ORM usage).

I implement future-proof architectures and patterns so you can continue to deliver quickly and at a lower cost.

My usual playground:

Python & Django (expert, including Django REST Framework and advanced ORM)

Massive refactoring (I have already migrated an entire Android application from legacy Java to Kotlin + MVVM + Coroutines)

Complex SAAS, ERPs, internal tools, financial/insurtech products

Implementation of tests, monitoring, CI/CD, and modern best practices

Whether it's to take over your exploding MVP, consolidate your in-house ERP, or save a project that's starting to go off the rails, I become your backup engineer: the one who arrives, understands quickly, codes cleanly, and delivers concrete results.

If your application has proven itself in the market but the "vibecode" has reached its limits…

Write to me. We'll make it professional, together.

Industry field of expertise

Languages

French
Native or bilingual
English
Fluent

Workplace preferences

Remote only

Primarily works remotely

Dedomainia
Software Engineer
BANKING AND INSURANCE
September 2022 - February 2026 (3 years and 5 months)
Bordeaux, France
• Maintenance and development of the Dedomainia flagship product: Lisa, a SAAS for managing and monitoring Longevity Swap deals (a longevity risk hedging financial swap).

• Development of Lisa 2.0, the latest Lisa version.
◦ I played a key role in resolving technical debts and designing future-proof patterns to allow delivery at a reasonable cost.
◦ I developed a suite of tools used by account managers to administrate client Lisa instances, ranging from automatic migration, to data import/export commands and workflow launchers.

• Development of a product (Lassi) designed to help actuaries build precise longevity models required to accurately price pension amounts.
◦ I added a module that was able to handle specificities of the models used for the Dutch market.
◦ I also developed a module that improved the performance of the tools used for the UK market by multiple orders of magnitude, while giving more flexibility to the end user.

• Development of a product (Lofac) designed to help pension fund administrators to accurately measure the impact of early or late retirement.
◦ I handled most of the technical aspect of this project with the help of a junior developer whom I mentored.
◦ This project was delivered on time, had good performance, and had only one minor UX bug on release.

• Development of a product (Alicia) designed to help hedge funds and brokers to manage retail RILA investments.
◦ I was the main developer on this project, providing technical insights to the product management and guiding other developers.

• Onboarded new recruits, mentored junior developers.

• Participated in internal workshops to solve technical issues and improve the technical level of our teams
Python Rust SQL Django JavaScript
U'Wine
Software Engineer
WINE AND SPIRITS
October 2021 - September 2022 (11 months)
Bordeaux, France
• Maintenance and development of the Android U'Wine application: a wine cellar management and e-commerce application.

• Refactoring of an Android legacy application to the latest Google recommendations and engineering best practices
◦ Migration from Java to Kotlin, MVVM, Coroutine, etc.

• Maintenance and development of the company's ERP (based on Odoo).
Kotlin Android Java ERP Odoo
Waycom
Software Engineer
TELECOMMUNICATIONS
September 2019 - October 2021 (2 years and 1 month)
Bordeaux, France
Maintenance and development of the company's custom ERP.

Optimization of database usage (through advanced use of Django ORM) resulting in most used pages loading data seven times faster.

Complete overhaul of the error management system
Django SQL Python HTML JavaScript