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Guillaume ChartierGC

Guillaume Chartier

Symfony Developer | Custom Business Applications

€580/day
Angers, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Guillaume

Is your current tool no longer keeping up? Excel slowing down, software no longer maintained, scattered data?

I have been developing custom web applications for VSEs/SMEs since 2011. My core business: transforming your business needs into simple, reliable, and scalable tools.

Specifically, I can assist you with:

– Custom Business Applications: CRM, ERP, inventory management, production tracking, planning
– Excel Transformation: Your files become a real web application, accessible everywhere
– Takeover and Maintenance: Your developer left? I take over the code, stabilize it, and make it evolve
– AI Integration: Automatic data extraction, chatbots, assisted writing (Mistral, 100% sovereign)
– Tool Integration: APIs, automatic synchronization between your existing software

My Approach:

I talk business before talking tech. Every project starts with truly listening to your daily needs. No jargon, no overly complicated systems. A tool that fits YOUR way of working.

Stack: Symfony, PHP, MySQL, API Platform, Nuxt.js, Docker

13+ years of experience. 50+ projects delivered. Single point of contact from A to Z.

I work both directly with clients and as a subcontractor for web agencies.

Have a project in mind? Describe your problem to me, and let's discuss it.
  • French

    Native or bilingual

  • English

    Conversational

  • Spanish

    Basic

Can work on-site
Angers (up to 50km), Angers (up to 10km), Beaufort-en-Anjou (up to 20km), Saumur (up to 20km)

Experience

  • Entreprise de livraison dernier km
    Google Sheets Automation via API Integration
    February 2026 - Today (4 months)
    Development of a web application to automate the profitability tracking of a last-mile delivery company.

    Context: The company tracks its profitability daily via Google Sheets, with manual data entry from 3 external software: delivery management, driver time tracking, and invoicing. This process is time-consuming and prone to errors.

    Mission: Design a web application that connects to the APIs of the 3 existing tools to automatically retrieve data and centralize it in a single interface.

    Deliverables:
    - Integration of APIs for delivery management, time tracking, and invoicing tools
    - Real-time profitability tracking dashboard
    - Complete automation of data collection (elimination of daily manual entry)
    - Reporting and performance indicators for business management
    Automation API Platform REST API Symfony Dashboard and Reporting
  • Gedio AI
    SaaS Platform for Internal Procedures Management
    SOFTWARE PUBLISHING
    July 2025 - Today (11 months)
    Angers, France
    Development of a comprehensive solution to centralize and secure company knowledge with an integrated AI assistant

    Conversational AI assistant based on Mistral
    RAG system for analyzing large documents
    Procedure management with access control by department
    Automatic import from emails
    Secure multi-tenant architecture
    Symfony Nuxt.js Mistral Mistral AI
  • Codekraft
    Agile Integration for Large-Scale Project
    SOFTWARE PUBLISHING
    June 2025 - August 2025 (2 months)
    Angers, France
    Full-stack Developer (Senior Support)
    Mission: Agile integration for a large-scale project

    Called in for critical support following the departure of a lead developer, I joined a team of 5 to ensure the continuity and delivery of a complex web project.

    Key Achievements:

    Symfony Backend: Took over and developed complex features, optimized existing architecture, and performed corrective maintenance.

    React Frontend: Made occasional interventions on the user interface to ensure data flow consistency.

    Collaboration & Workflow: Worked in an agile environment managing tickets with Jira.

    DevOps & CI/CD: Daily use of Docker for development environments and Gitlab for versioning and project tracking.

    Result: Operational integration in under 48 hours, allowing the agency to meet its delivery deadlines without compromising technical quality.
    Symfony React.js Atlassian JIRA Gitlab

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Education

  • Advanced Technician Certificate in Management Information Systems
    felix faure - beauvais (oise)
    2003

Skill set

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