Freelancer profile translated to English.

Description

🤝 Looking for a reliable PHP/Symfony backend engineer who can get up to speed quickly? Let's discuss your needs.

👨‍💻 Who am I?

A Backend Engineer with 5 years of experience in PHP/Symfony, specializing in designing REST APIs, modernizing legacy systems, and structuring data models in multi-team environments.

🔧 Expertise

→ PHP 8 / Symfony — Contract-first REST APIs

→ Data modeling, data consistency, SQL optimization

→ Modernization of legacy architectures

→ CI/CD GitLab, Docker, PHPUnit, TDD, Clean Code

📈 Projects & Missions

→ TDK Telecom | Backend PHP / API

Development of backend APIs and integration of telecom services.

Stack: PHP · Symfony · MySQL · Docker

→ Link Mobility | Backend Engineer PHP / API

Integration of an RCS channel, REST API design, GitLab CI/CD.

Stack: PHP 8 · Symfony · MySQL · Docker

Result: reliable flow, stabilized deployments.

→ Randstad Digital | Backend PHP / Data

High-traffic health & education platforms, data modeling, legacy refactoring.

Result: -30% response time on critical endpoints.

→ IAD Territoire Digital | Backend Symfony

CRM integration, PHPUnit tests.

Result: test coverage 20% → 80%.

🎯 Stack

PHP 8 · Symfony · REST API · MySQL · PostgreSQL · Docker · GitLab CI/CD · PHPUnit

📍 Paris / Île-de-France / Remote — ⚡ Available immediately

👉 linkedin.com/in/serignesaliousene

Industry field of expertise

Languages

French
Native or bilingual
English
Fluent

Workplace preferences

Can work on-site

Sarcelles (up to 50km), Paris (up to 50km), Lyon (up to 50km), Lille (up to 50km)

Link Mobility
Backend Engineer PHP / API & Integration
TELECOMMUNICATIONS
October 2023 - May 2024 (7 months)
Riorges, France
Description:
Backend integration of a new communication channel (RCS)
into a high-stakes multi-channel platform.

Missions:
Design and development of the PHP/Symfony backend API connecting the platform to the new RCS channel
Definition of exchange contracts between services and participation in inter-system flows
Progressive modernization of the existing system towards a more modular architecture
Setup and evolution of GitLab CI/CD pipelines (build, tests, automated deployments)
End-to-end testing and regular code reviews
Results:
Delivery of a reliable end-to-end communication flow
Improved deployment stability and reduced production errors
Better traceability and inter-team collaboration (product, front, QA)
Symfony MySQL Gitlab CI/CD Docker REST APIs
Randstad Digital
Backend Developer PHP / Data & Performance
HEALTH AND WELLNESS
February 2022 - September 2023 (1 year and 7 months)
Lyon, France
Description:
Backend development and optimization on high-traffic web platforms
in the health and education sectors.

Missions:
Backend business data modeling and structuring
SQL query optimization and performance improvement on critical endpoints
Refactoring of legacy PHP/Drupal components into reusable and maintainable modules
Design of custom Symfony/Drupal modules shared across multiple projects
Contribution to CI/CD pipelines and delivery processes
Results:
30% reduction in response times on critical endpoints
Modules reused on several strategic projects
Zero sprint overruns throughout the period
Drupal MySQL Docker Gitlab CI/CD Symfony
IAD Territoire Digital
Backend Developer Symfony / Data Integration
SOFTWARE PUBLISHING
November 2018 - September 2021 (2 years and 10 months)
Besançon, France
Description:
Development of internal backend tools with CRM integration
and data synchronization between systems.

Missions:
Symfony backend development (services, internal APIs, business logic)
Integration with SuiteCRM via web services and multi-system data synchronization
Implementation of PHPUnit unit tests and improvement of software quality
Participation in the definition of inter-application data flows
Technical supervision of 2 junior developers
Results:
Test coverage increased from 20% to 80%
Net reduction in production regressions
Complete autonomy over the entire backend development cycle
Symfony Drupal PHP JavaScript PostgreSQL