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Adrien Jacquier BretAJ

Adrien Jacquier Bret

Mobile & IoT Architect | React Native, Backend

€500/day
3 projects
Grenoble, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Adrien

Connected iOS / Android mobile applications, robust architecture, reliable backend

I designmobile applications connected to the physical worldwith strong technical constraints and reliability requirements in production.

I support your product and technical teams on:
  • Development ofconnected mobile applications
  • Design ofbackends for IoT
*Architectural choicesand technical decisions

*Redesign or improvementof existing applications
  • Support andtraining of your teams

Specializing in IoT(Internet of Things): I develop applications that communicate withconnected physical objects**: **connected devices(medical devices, smartwatches, automotive, home automation...), **embedded systems**, or **industrial devices**.

By integrating various protocols:

*BLE(Bluetooth Low Energy)

*NFC

*Wi-Fi(TCP/HTTP)

*USB

This type of development involvesreliabilityanddata synchronizationconstraints not found in classic applications.

My approach is not limited to writing code. I pay particular attention to:

*Robustnessin production

*Readabilityandmaintainability
  • Overall architecturalconsistency
*Performanceand fluidity

As a good communicator and simplifier, I facilitate exchanges between product, design, and technical teams.

My technical stack:
  • **Mobile**: React Native, Expo, Swift, Kotlin
  • **Backend**: Elixir, GraphQL, PostgreSQL, InfluxDB
  • **DevOps**: Gitlab CI/CD, Docker
  • French

    Native or bilingual

  • English

    Fluent

Can work on-site
Grenoble (up to 50km), Chambéry (up to 50km)

Experience

  • Pixload
    Architecture & development of the Pixload mobile application for iOS & Android with React Native
    SOFTWARE PUBLISHING
    August 2025 - Today (1 year)
    Grenoble, France
    *Develop from scratchan IoT cross-platform mobile application (iOS/Android) for professional photographers - Pixload.

    *Architect a dual codebaseinSwiftandKotlinand integrate it into aTypescriptenvironment withReact Nativeand **Expo**.

    *Implement a USB communication modulefor transferring images between a camera and the application using thePTP(Picture Transfer Protocol) communication protocol.

    *Solve complex problems- compression, queueing, frontend/backend synchronization, low-level USB data transfer...

    *Design a sober and intuitive user interface(UX/UI).
    React Native Kotlin Swift Mobile Development IoT
  • La Haute Société
    Architecture & development of the SwissKubik mobile application for iOS & Android with React Native
    SOFTWARE PUBLISHING
    October 2024 - April 2025 (6 months)
    Grenoble, France
    *Architecta React Native & Expo monorepo application.

    *Implementan UART protocol encoding/decoding service with Typescript to **communicate via Bluetooth with a connected object**.

    *Integratea part of the application

    *Trainthe development team on mobile development, **React Native**, **IoT constraints**, and **deployment on the App Store and Play Store**.
    React Native Mobile Development Expo Connected Objects Bluetooth Low Energy
  • Lancey Energy Storage
    Mobile & Fullstack Developer
    ENERGY AND UTILITIES
    January 2021 - April 2024 (3 years and 4 months)
    Grenoble, France
    *Architect and develop from scratchan IoT mobile application with React Native / Expo to control connected radiators.

    *Take over and evolve alonea multi-service Elixir backend (GraphQL, MQTT, InfluxDB, PostgreSQL) with high availability constraints.

    *Develop web applicationswith React.js and Phoenix LiveView.

    *Implement low-level communication protocolsTCP (Wi-Fi) and NFC with Typescript and Elixir.

    *Write 1000+ unit and integration testswith Jest and ExUnit and document applications.

    *Build continuous deployment CI/CD pipelineswith Gitlab.

    *Train developerson the technologies used by the software team.

    *Communicate and simplifyto external partners and internal teams within the company.
    React Native Elixir Typescript Mobile Development Software Architecture

Reviews

5.0

Out of 1 rating

MaximeM

Maxime

La Haute Société

Reviewed on 4/7/2025

I had the pleasure of working with Adrien on the development of an App in React Native, I can only recommend his services. From the beginning of our collaboration, he was very available and attentive to our needs. He always answered our questions with relevant and wise advice. If you are looking for a competent, responsive, and committed developer, do not hesitate to call on Adrien. I am convinced that you will be as satisfied with his collaboration as I was!

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Education

  • Application Developer - Degree level 6 (Bac+3/4)
    OpenClassrooms
    2020

Skill set

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