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Romain CosRC

Romain Cos

PHP Developer - Full Stack

€450/day
Nantes, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Romain

Specializing in backend development with the Symfony framework, I have been supporting artisans, startups, SMEs, and large corporations for over 10 years in the design, development, and maintenance of robust, high-performance, and scalable web applications.

My initial background as a graphic designer allows me to bring a particular perspective on ergonomics, aesthetics, and user experience, complementing my technical skills.
  • Symfony Expertise
  • REST API, third-party integrations, databases
  • Code quality, testing, performance & security
  • Agile collaboration, clear and reliable communication
  • UX/UI sensitivity
Available for remote or in-person freelance missions (depending on location).

See you soon to discuss your project.
  • French

    Native or bilingual

  • English

    Fluent

Can work on-site
Nantes (up to 50km)

Experience

  • Nextlane
    Analyst Developer
    SOFTWARE PUBLISHING
    May 2022 - October 2024 (2 years and 5 months)
    Main missions and achievements:

    1. API Development
    Design and implementation of RESTful APIs: Needs analysis, writing technical specifications, and implementing services to enable seamless integration with third-party systems.
    API Security: Implementation of standards such as OAuth2, JWT, and role management for secure access control.
    API Documentation: Creation and maintenance of technical documents.

    2. Backend Development
    Microservices Development: Using modern frameworks (Symfony) to build scalable and maintainable solutions.
    Database Management: Design and optimization of relational databases (MySQL).
    Test Automation: Setting up unit and integration tests (PHPUnit) to ensure feature robustness.
    Continuous Deployment: Integration of CI/CD pipelines (GitLab) and automating deployments.

    3. Project Management
    Requirements Analysis: Participation in workshops with stakeholders to define functional and technical requirements.
    Methodological Monitoring: Use of agile methodologies (Scrum) and tools like Jira to plan sprints, manage priorities, and track progress.
    On-time Delivery: Management of project constraints (time, budget, quality) by ensuring regular communication with clients and the product team.

    Technical Environment:
    Languages and frameworks: PHP, Symfony, JavaScript, Mysql
    DevOps Tools: Docker, Git
    Databases: MySQL
    Collaborative Tools: Jira, GitLab

    Impact:
    Improved customer satisfaction through robust and well-documented APIs.
    Reduced development time through automated processes.
    Contribution to the success of several strategic projects, enabling the company to expand its product offerings.
    Backend Development API PHP Gitlab CI/CD Batch ETL Project Management Frontend Development MySQL
  • ACCMO.fr
    Web Developer
    CONSULTING AND AUDITS
    February 2021 - February 2021
    Visual creation and design of communication materials.
    Showcase website and CMS created with Symfony 4.
    SEO and server maintenance
    Symfony 4 Visual Identity Visual Communication
  • Mecachrome Atlantique
    Web Developer
    AVIATION AND AEROSPACE
    September 2015 - Today (10 years and 9 months)
    Sainte-Luce-sur-Loire, France
    PHP JavaScript Symfony 4 MySQL Network Administration Web Project Management Graphic Design

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Certifications

  • Symfony 5 Framework
    OpenClassRoom
    2021
  • REST API with Symfony
    OpenClassRoom
    2021

Skill set

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