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Junsong D.JD

Junsong D.

Senior Software Engineer | Tech Lead (Hands-on)

€750/day
Rueil-Malmaison, FR
15+ years

Average response time: 1 hour

Freelancer profile translated to English.
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About Junsong

I help companies deliver faster and better through AI and mastered engineering.
15 years of experience in enterprise web and mobile development, including 6 years as Tech Lead at Saint-Gobain, leading teams of 50+ people in France and India.
My approach: solid architectures, aligned teams, and AI-augmented workflows to reduce delivery times without sacrificing quality.
Roles: Tech Lead, Engineering Manager, Web/Mobile Architecture, AI transformation of dev teams.
Stack: React Native, Angular, React.js, Azure, TypeScript, Node.js, CI/CD, Docker.
  • French

    Fluent

  • English

    Fluent

  • Chinese

    Native or bilingual

Remote only
Primarily works remotely

Experience

  • Saint Gobain
    AI-Driven Engineering Lead – Web & Mobile Platforms
    January 2026 - Today (7 months)
    Paris, France
    Adoption and implementation of AI-augmented development practices: Claude, agentic coding workflows, Spec-Driven methodology.
    • Acceleration of deliveries, improvement of code consistency and quality across all product teams.
    speckit Claude AI Pencil Github Actions
  • Saint Gobain
    Technical Project Manager / Delivery Manager
    January 2015 - February 2026 (11 years and 1 month)
    Mobile & Web Projects Management — Architecture — Agile — Offshore Team
    I am a freelance Technical Project Manager specializing in complex digital projects (mobile and web applications). I support companies in the design, structuring, and delivery of digital products, from the scoping phase to production.
    I am involved in product coordination, technical architecture, and delivery quality, with extensive experience collaborating with offshore development teams (India).
    Main Responsibilities
    Management of Mobile (iOS / Android / Flutter / React Native) and Web applications projects
    Management of a developer team based in India (5 to 12 developers)
    Organization and facilitation of Agile rituals:
    Sprint planning, daily, review, retrospective
    Delivery monitoring: backlog, prioritization, roadmap, risk management
    Communication between business teams, designers, and developers
    Multi-stakeholder coordination (product, marketing, IT, management)
    Architecture & Technical
    Design of scalable application architectures (API, microservices, cloud)
    Definition of technical standards and best development practices
    Implementation of quality processes:
    CI/CD, code review, automated testing
    Technical review and support for developers
    Performance & maintainability optimization
    Design System & Product
    Participation in the design and evolution of a Design System
    Close collaboration with UX/UI Designers
    Harmonization of components between Web and Mobile
    Implementation of shared libraries and technical documentation
    Methodology
    Agile / Scrum
    Product & business value oriented approach
    Continuous delivery
    DevOps & software quality culture
    Technical Environment (depending on projects)
    Frontend: React, Angular, Vue.js, Flutter, React Native
    Backend: Node.js, Java, .NET
    API: REST / GraphQL
    Cloud: AWS / Azure / GCP
    Tools: Jira, Confluence, GitHub, Figma
    Mobile Application Web development Microsoft Azure Claude Code Cloud Azure
  • NetDevices
    Mobile & Web Developer
    DIGITAL AND IT
    October 2012 - October 2016 (4 years)
    Web & Mobile
    Coordination of Web (React / Angular) and Mobile (Flutter / React Native) development
    Management of store versions (App Store & Google Play)
    Application performance and stability optimization
    Critical bug management in production

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Education

  • Engineer
    supinfo
    2011

Certifications

  • Google UX certificate
    Google
    2023
    UI/UX UX Design

Skill set

Categories