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Antoine MercierAM

Antoine Mercier

Software Engineer | Java | Angular

€440/day
Nantes, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Antoine

Software engineer with 7 years of experience in application development, specializing in the Java ecosystem and modern web technologies. I have developed in-depth expertise in designing and implementing robust, maintainable, and scalable technical solutions.

Throughout my career, I have gained a global vision of the project lifecycle, from design to production. This experience covers both technical aspects and the understanding and analysis of business needs.

I particularly thrive in collaborative environments where I can combine technical expertise with contributions to team dynamics. I am particularly committed to technical quality and good development practices.

Today, as a freelancer in the Nantes area, I am looking for assignments that allow me to combine architectural design, technical development, and continuous improvement of development practices.
  • French

    Native or bilingual

  • English

    Fluent

  • Italian

    Basic

Can work on-site
Nantes (up to 20km)

Experience

  • Velco
    Software Engineer
    March 2025 - September 2025 (6 months)
    Nantes, France
    👨‍💻 Develop backend applications in Java and Kotlin (JDK 17) with Spring Boot (v2 & v3)
    🌐 Design and evolve REST APIs for client applications
    📨 Use RabbitMQ for communication with IoT devices
    🚀 Perform version upgrades to Spring Boot 3
    🧪 Write unit tests with JUnit 5 to ensure code quality
    💾 Manipulate data with MariaDB and DynamoDB (NoSQL)
    🎨 Develop and refactor frontend screens in Angular 19
    ☁️ Automate and manage cloud infrastructure with Terraform and AWS
    Java Kotlin Spring boot Angular Amazon Web Services
  • VALEURIAD
    Software Engineer
    November 2020 - December 2024 (4 years and 1 month)
    Nantes, France
    On assignment at CNIEG:
    👨‍💻 Develop backend applications in Java (11/17/21) with Spring Boot (v2 & v3)
    🛡️ Design resilient architectures with Spring Retry and Resilience4j
    🎨 Modernize the frontend by migrating to Angular
    ✅ Adopt a test-first/TDD/BDD approach
    📐 Apply development patterns to improve code maintainability
    ⚙️ Implement cross-cutting concerns with Spring AOP
    📨 Implement messaging systems with RabbitMQ
    🔎 Integrate Elasticsearch for advanced search functionalities
    💾 Store data with Oracle and PostgreSQL
    📦 Use Docker and Kubernetes daily
    👥 Practice pair programming, mob programming, and code reviews
    🤝 Actively participate in agile rituals (Scrum then Scrumban)
    Java SpringBoot Angular Clean Code
  • Societe Generale Securities Services - SGSS
    IT Management Assistant Engineer
    September 2017 - October 2020 (3 years and 1 month)
    Nantes, France
    👨‍💻 Develop applications in Java 8 with Spring
    💾 Store and manipulate data with SQL Server and Hibernate
    🛠️ Use GitHub for version management
    👥 Practice pair programming and code reviews
    📦 Deploy applications (WAR) on Linux servers
    🔄 Automate processes with jobs and stored procedures
    📝 Write technical and user documentation
    🎯 Analyze needs and support users
    Java Spring

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Education

  • Master's Degree - Digital and Data Solutions Manager - RNCP Level 7
    ENI Ecole Informatique
    2020
  • Bachelor's Degree - Computer Science Designer Developer - RNCP Level 6
    ENI Ecole Informatique
    2019

Skill set

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