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Grégoire PortierGP

Grégoire Portier

Custom Business Tool Full-Stack Developer

€400/day
Ancenis, FR
0-2 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Grégoire

Full-Stack Web Developer Node.js | TypeScript | React | Python


Still managing your business with Excel? Do you have piles of files, an internal tool that has become difficult to scale? I will build you a tailor-made solution, designed to last.

What I do concretely
Designing internal tools from scratch, redesigning existing applications, automating manual processes.
I design the architecture, build the API, and secure everything. Node.js, TypeScript, and Python for the back-end, React.js if an interface is needed.
A different stack? With AI and a little time, I can quickly upskill rather than say no.

My commitments
  • Transparency: You always know the status of your project and why certain decisions were made.
  • Ownership: The code and its documentation belong to you.
  • Robustness: I prioritize a sound foundation over a poorly built, quick delivery.

AI as an Efficiency Driver
I use AI to assist my code writing: audit, exploration of alternatives, writing simple files.
I primarily use Claude Code, as well as an AI installed locally when data sovereignty is a necessity, which ensures that no data leaves your environment.

My Background
I have five years of experience in demanding environments: laboratories, industry, regulated sectors, where adherence to strict processes and rigorous technical report writing were non-negotiable. I apply this discipline today to data architecture and code documentation.

Have a project to build or a tool to evolve? Let's discuss it.
  • French

    Native or bilingual

  • English

    Fluent

Can work on-site
Ancenis (up to 50km), Nantes (up to 50km), Angers (up to 50km), Rennes (up to 50km)

Experience

  • Tritons
    Full-Stack Developer
    SOFTWARE PUBLISHING
    July 2025 - September 2025 (2 months)
    Guyancourt, France
    At Tritons, my mission is to offer my expertise for the development of internal tools for the company to improve their processes and the services they offer to their clients.

    • Discovery of the company's internal systems (infrastructures, practices, technical stack...)
    • Development of a Python/VueJS web application with OIDC identification for tracking the status of various sites hosted on Tritons' infrastructures
    • Automation, CI/CD, and Kubernetes deployment of the company's sites
    • Redesign of the Tritons hosting platform architecture, moving from a CRUD architecture to an Event Sourcing architecture
    • TDD development
    • Design of a Domain-Driven Design oriented architecture
    Python Vue.js Kubernetes Event Sourcing TypeScript
  • Wessling France
    Agri-food Analysis Technician
    AGRICULTURE
    September 2021 - June 2023 (1 year and 9 months)
    Les Ulis, France
    In the Alcohol/Metals team, my mission was to develop new heavy metal analysis methods, get the laboratory certified for these analyses, then perform daily analyses while participating in the continuous improvement of the laboratory.

    • Creation, establishment, and writing of new operating procedures
    • Establishment and monitoring of test series according to current scientific methods to establish the reliability of operating procedures
    • Creation and adaptation of the work environment (organization, elimination of cross-contamination risks, reduction of human error sources...)
    • Work in near autonomy (sole metals technician in the laboratory)
    • Analysis by ICP (Inductively Coupled Plasma Mass Spectrometry), coupled with Mass Spectrometry, after sample mineralization
    • Equipment maintenance (first and second level)
    • Documentary watch (writing and maintaining protocols, monitoring new standards, evolving specifications)
    • Translation of a client's needs into an exploitable solution
    • Support for other departments in the building (occasional help to the logistics department, advice to the microbiology laboratory, creation of quality and metrology tools...)
    Physicochemical Analyses Agri-food
  • Cerap prévention
    Radiation Protection Technician
    CHEMICAL
    May 2020 - August 2020 (3 months)
    Les Ulis, France
    The mission consisted of bringing our analytical expertise to our clients, major players in the nuclear industry, to analyze their final radiation protection level.

    • Analysis in constrained environments (radioactive hazard zone or high noise intensity)
    • Work in a highly specialized team (vital context) with enhanced communication
    • Strict adherence to safety regulations and instructions
    • Constant vigilance, perpetual questioning of systems
    Nuclear Safety

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Education

  • Web and Mobile Web Developer
    École O'clock
    2025
    Développeur web et web mobile
  • First level in
    INSTN
    2020
    Premier niveau en

Skill set

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