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Arnaud Y.AY

Arnaud Y.

Backend developer PHP / Python / Kubernetes / PSM

€550/day
Paris, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Arnaud

💡 Senior Backend Engineer specialized in REST API design, Cloud Native architectures, and high-volume platforms.
I support companies in the design, development, and evolution of robust, performant, and maintainable backend applications. My expertise covers API development, performance optimization, distributed architectures, and deployment industrialization with Docker, Kubernetes, and ArgoCD on Google Cloud Platform.

✅ Over 10 years of experience in web development, Symfony 6 Certified Developer, and Professional Scrum Master I (PSM I), I work on strategic projects in demanding environments.
Throughout my career, I have supported companies such as Believe, BFMTV, Aramisauto, L'Équipe, and Groupe Printemps in the success of their technical projects.

🎯 My mission: to transform complex technical challenges into reliable, scalable, and performant solutions, while fostering effective collaboration and sustainable software quality.
  • English

    Fluent

  • French

    Native or bilingual

Can work on-site
Paris (up to 15km)

Experience

  • Believe
    Senior Backend Engineer Symfony / Kubernetes
    PRESS AND MEDIA
    April 2025 - Today (1 year and 4 months)
    Paris 17, France
    Within Believe's Backend team, I contribute to the GCP migration and the evolution of large-scale music distribution platforms. I work on backend architecture, REST API development, Cloud Native configuration (Google Cloud, Kubernetes), performance, and deployment industrialization.

    Design and development of a REST API for creating and managing Spotify Video Releases.
    Participation in architectural choices and development of new backend features.

    Migration of several applications to GCP and PHP 8.3.
    Migration of cronjobs to Google Kubernetes Engine (GKE) to improve their reliability, scalability, and operation.
    Design and maintenance of Kubernetes manifests (Deployment, CronJob, ConfigMap, Secret, Service).
    Deployment industrialization using a GitOps approach with ArgoCD.
    Configuration and maintenance of KrakenD for API management and routing.
    Integration of Google Cloud Storage for application resource storage.
    Optimization of application performance and continuous improvement of code quality.

    Implementation of SLOs (Service Level Objectives) and Datadog dashboards to enhance the observability of APIs and cronjobs.
    Participation in code reviews and promotion of good development practices.

    Stack: PHP 8.3, Symfony 6, Kubernetes (GKE), Docker,
    ArgoCD, GitLab CI, KrakenD, Google Cloud Storage, Redis, MySQL, Grafana,
    Git, Jira.
    Kubernetes Google Cloud Platform Argo CD API Platform Datadog
  • PRINTEMPS SAS
    Senior Backend Engineer
    E-COMMERCE
    March 2023 - March 2025 (1 year and 11 months)
    Pantin, France
    Within the Groupe Printemps' E-commerce IT team, I contributed to the transformation of the information system by participating in the design of REST APIs and the migration from a monolithic architecture to a microservices architecture. I also contributed to improving the performance and maintainability of the Printemps, Place des Tendances, and Citadium platforms.

    Contribution to the transformation from a monolithic architecture to a microservices architecture with Symfony 6.4 and API Platform.
    Implementation of MongoDB as the database for new REST APIs and migration of legacy data from Oracle.
    Implementation of a hexagonal architecture to improve application maintainability and scalability.
    Development of new backend features and maintenance of existing services.

    Implementation of unit and functional tests with a code coverage goal of over 70%.
    Optimization of API performance using Redis, Varnish, and query optimization.
    Monitoring of deployments with ArgoCD and application monitoring via Grafana.
    Industrialization of the development environment with Docker.

    Stack: PHP 8.3, Symfony 6.4, API Platform, MongoDB, Oracle, Docker, ArgoCD, Grafana, Redis, Varnish, Algolia, GitLab, Jira, Linux.
    SonarQube Docker Redis Symfony MongoDB
  • ARAMISAUTO
    Senior Python, PHP Developer
    AUTOMOBILE
    September 2021 - March 2023 (1 year and 6 months)
    Arcueil, France
    Within the E-commerce team, I contributed to the redesign and evolution of B2B and B2C platforms, addressing performance, scalability, and software quality issues.

    Redesign of the auction engine on FastAPI (Python).
    Development and evolution of B2B and B2C platforms based on Symfony 3.4 and Symfony 4.4.
    Design and development of new business features, particularly around auctions, vehicle trade-ins, and invoice generation.
    Participation in dependency upgrades to improve application maintainability and security.
    Performance optimization using Redis, RabbitMQ, and SQL query optimization.
    Implementation of unit and functional tests to enhance development quality.
    Code quality improvement with SonarQube.
    Optimization of user experience using Hotjar and Contentsquare to improve user journeys and conversion rates.
    Application monitoring via Splunk and evolutionary maintenance of platforms.

    Stack: PHP 7.4, Python 3, Symfony 4.4, FastAPI, API Platform, uvicorn, sqlAlchemy, MySQL, Docker, Redis, RabbitMQ, Elasticsearch, SononarQube, Splunk, GitHub, Linux.
    Docker Symfony Framework Python FastAPI Kubernetes

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Education

  • Master's degree in Computer Science CCI - Computer Science
    University François Rabelais of Tours
    2015

Certifications

Skill set

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