Freelancer profile translated to English.

Description

Is your backend becoming difficult to scale, unstable, or too complex to maintain?

I am Guillaume, afreelance backend developer specializing in PHP/Laravel for over 8 years**, and I help **SMEs and startupsdesign, evolve, and stabilize their web applications.

I primarily focus onbackend APIs**, **existing systemsto evolve, and SaaS projects requiringreliability**, **maintainability, and scalability**. I work on projects **from scratchas well as on **code takeovers**, **refactoring**, and **technical debt reduction**.

I regularly handlethird-party API integrationsto connect external services to existing platforms, synchronize data, and enable communication between different systems.

These integrations have been central to several projects in B2B, e-commerce, and business applications, used daily.

My approach is **pragmatic and results-oriented**: clear prioritization, readable code, tests where they add real value, and technical decisions designed to last.

I place great importance ontransparency**, sending a **daily reporton progress and tasks completed.

I have collaborated with Collective Minds, Tool4staffing, Insitaction, and Kumquats on projects already in production, involving existing code, multiple integrations, and strong business constraints.

Main stack: Laravel, PHP, backend development, REST API, PostgreSQL, MySQL, AI, Cloud services, Redis, Docker, CI/CD pipelines, and unit tests (PHPUnit) to ensure backend quality and reliability.

💬 Need to stabilize a backend, perform a third-party API integration, evolve an API, or take over an existing Laravel project?

Let's chat to see how I can help.

Industry field of expertise

Languages

French
Native or bilingual
English
Fluent
Spanish
Fluent

Workplace preferences

Can work on-site

Paris (up to 50km), Lille (up to 50km), Marseille (up to 50km), Lyon (up to 50km), Bordeaux (up to 50km)

Collective Minds
Laravel Backend Developer - MedTech SaaS Platform
MEDICAL
January 2025 - Today (1 year and 5 months)
Barcelone, Spain
Collective Minds' imaging platform connects hospitals, researchers, and the life sciences industry to facilitate collaboration.

I am involved in a MedTech product in production, with high stakes in reliability, traceability, and service continuity.
Development and evolution of a Laravel backend, including API design and maintenance, takeover of existing code, and refactoring actions on critical components.
Regulated environment, involving adherence to good security practices and requirements related to ISO 27001 certification, with a direct impact on technical choices and deployments.
Domain Driven Design Laravel Testing REST API Back-End Development
Tool4staffing
Backend Developer / Technical Lead - APIs & Integrations
HUMAN RESOURCES
April 2019 - December 2024 (5 years and 8 months)
Barcelona, Spain
Tool4staffing is an all-in-one SaaS solution that simplifies recruiters' work by centralizing their tools and streamlining the entire hiring process.
The platform has over 200 clients (BPI, Crédit Agricole, Mobiskill…) and thousands of daily active users.

I was involved in a B2B web platform in production, handling sensitive personal data, with significant requirements for reliability, security, and service continuity.

I participated in the evolution of the backend and business APIs, particularly on third-party API integration topics to connect external services (HR tools, partner systems, third-party services) to the existing platform.
These integrations enabled data synchronization, automation of business workflows, and interoperability between multiple systems.

Particular attention was paid to data protection, access management, and regulatory compliance (GDPR), in a constrained and heavily used application context.

I also contributed to the technical structuring of the backend, reducing existing debt, and improving the reliability of backend processes to secure evolutions and deployments.
PHP Backend Development REST API External API Integration ETL Processes
Insitaction
PHP Backend Developer - High-Traffic E-commerce Platforms
RETAIL (LARGE RETAILERS)
April 2018 - April 2019 (1 year)
Lille, France
I participated in the maintenance and evolution of several online e-commerce platforms, with constraints of high traffic, availability, and performance.
Contribution to the development and maintenance of several backends for web and mobile applications, including API management, code takeover, and adding new features.

Interventions carried out on systems in production, with a strong focus on stability, minimizing regressions, and service continuity.
PHP Backend Development Web Development REST API E-commerce