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Kevin RatajczakKR

Kevin Ratajczak

PHP/Symfony Backend Developer

€500/day
Lille, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Kevin

Passionate backend developer, I assist my clients in the design, maintenance, and evolution of robust and performant web applications.
Specializing in PHP/Symfony and with solid experience in complex architectures, I focus on code quality, service reliability, and technical consistency between the different system components.

My freelance experience has allowed me to work on various projects (Quotatis, Cotton Bird), whether to accelerate the development of new features, modernize an existing codebase, or structure micro-services under Docker.
I also master the integration of automated tests (Behat/PHPUnit), CI/CD, and Agile environments (Scrum/Kanban).

Always curious to learn and experiment, I cultivate two passions:
♟️ Chess, for the logic and strategy they inspire in me daily.
🏠 Home automation, where I design and control my own connected environment, combining technology and comfort.
  • French

    Native or bilingual

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

Experience

  • Quotatis
    Backend Developer
    June 2023 - Today (3 years and 2 months)
    Villeneuve-d'Ascq, France
    Participation in the maintenance, evolution, and modernization of a complex architecture based on a micro-services approach under API Platform.
    Implementation of technical recommendations aimed at securing the application foundation and improving consistency between different services.
    Key responsibilities:
    • Technological Migration: Complete transition of the ecosystem to Symfony 6.4 and API Platform 4.
    • Standardization of tests and good development practices to ensure code quality.
    • Reduction of technical debt and continuous performance improvement.
    • Contribution to software architecture and definition of common patterns between micro-services.
    • Technical supervision and support for teams in implementing robust standards.
    • Collaboration within two multidisciplinary teams, each composed of 2 backend developers and 2 to 3 frontend developers, fostering strong consistency between the different system components.
    • Active participation in Agile Scrum methodology, including all ceremonies: Sprint Planning, Daily Meeting, Sprint Review, and Retrospective, ensuring efficient management of evolutions and product quality.
    • Contribution to maintaining fluid communication between teams to ensure good synchronization, common understanding of challenges, and continuous delivery of features.
    Backend Service Development IT Architecture CI/CD Management External API Integration PHP Symfony
  • Cotton bird
    Backend Developer
    March 2023 - May 2023 (2 months)
    Villeneuve-d'Ascq, France
    Need to strengthen the development team to accelerate the development of certain features.
    Sylius PHP Symfony Docker
  • Pumpkin
    Backend Developer
    November 2019 - November 2022 (3 years)
    Lille, France
    Participation in the maintenance, evolution, and modernization of a complex architecture based on a micro-services approach.
    Implementation of technical recommendations aimed at securing the application foundation and improving consistency between different services.
    Key responsibilities:
    • Standardization of tests and good development practices to ensure code quality.
    • Reduction of technical debt and continuous performance improvement.
    • Contribution to software architecture and definition of common patterns between micro-services.
    • Technical supervision and support for teams in implementing robust standards.
    Docker Backend Service Development CI/CD Management Symfony PHP Domain Driven Design

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Education

  • Professional Bachelor's Degree
    Insset - Saint Quentin
    2014

Skill set

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