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Jonathan SylvestreJS

Jonathan Sylvestre

Software engineer

€650/day
Paris, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Jonathan

Introduction

Graduated from ISC Paris, I spent three years in consulting firms (Accenture, Velvet Consulting) transforming business needs into concrete solutions. This experience gave me a clear vision of business challenges, but it was my passion for code that led me to software engineering.

What I offer

  • **Architecture & Design**: Implementing resilient and scalable architectures, aligned with your business needs.
  • **Quality & Security**: Automated tests, code reviews, and best practices for a reliable product.
  • **Performance & Scalability**: Logical optimizations, database tuning, caching, CDN, and load testing.
  • **Automation & Deployment**: CI/CD pipelines to accelerate the deployment cycle.
  • **Mentorship & Leadership**: Pair programming, knowledge sharing, and mentoring junior developers.

My toolbox


**Languages**: Go, Java (Spring Boot), Rust, Python, JavaScript

**Front-end**: React JS

**Databases**: PostgreSQL, MongoDB, Redis

**Messaging & Streaming**: Kafka

**Containers & Orchestration**: Docker, Kubernetes

**Cloud & DevOps**: Git, GitHub Actions

**Operating Systems**: Linux, macOS

Why work with me?

My dual background in consulting and engineering allows me to understand your business objectives while delivering clean, tested, and future-proof code.
  • English

    Fluent

  • French

    Native or bilingual

  • Japanese

    Conversational

Can work on-site
Paris (up to 40km)

Experience

  • imagino
    Backend engineer
    July 2023 - Today (2 years and 11 months)
    Backend engineer in the R&D department of a SaaS startup. Mainly focused on the integration of APIs, technologies to bridge external systems to the platform.
  • PMU
    Fullstack engineer
    ENTERTAINMENT AND LEISURE
    December 2021 - June 2023 (1 year and 7 months)
    Paris, France
    Full stack developer on a project to revamp the PMU's horse racing betting loyalty system.

    • Design and enrichment of a REST API written in Spring Boot to communicate with PMU partners.
    • Creation of ReactJS components for the back office managing PMU's promotional offers.
    • Performed partitioning and indexing operations on the database to improve read speed.
    • Implementation of SQS and Kafka message queues.
    • Production of clean and testable code using TDD (Test Driven Development).
    Java Typescript Spring boot React.js PostgreSQL AWS Git
  • Groupe O2i
    Fullstack engineer
    TECH
    April 2020 - October 2021 (1 year and 6 months)
    Gennevilliers, France
    Full stack developer within a company specializing in services for businesses in the press, retail, and communication agencies.

    • Modification of the REST API (creation of services, addition of endpoints).
    • Creation of a video player for the collaborative document editing module.
    • Rewriting of the print template management module from AngularJS to ReactJS.
    JavaScript AngularJS Java React.js Spring boot Typescript Amazon Web Services (AWS) Git

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Education

  • Master's degree in Information Systems Management
    ISC Paris
    2016

Skill set

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