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Pierre S.PS

Pierre S.

Swift/Kotlin/Flutter Mobile Engineer

€580/day
7 projects
Rouen, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Pierre

I am a computer engineer graduated from INSA Rouen, specializing in mobile applications.

I started my career as an engineer within digital services companies, where I had the opportunity to work for large groups such as Airbus and Orange, where I collaborated with great colleagues who helped me understand the professional world.

In 2017, I chose to create my own company to leverage my expertise for a wider range of projects. I have worked on various IT projects, alone or in teams, ranging from simple development to the design of complete mobile applications (Architecture, Design, Backoffice). I have had the privilege of working for large groups like BforBank, Bouygues, Gras-Savoye, and for smaller companies. Notably, I developed personal applications such as Taromètre and Quiz-Factory, which allowed me to practice my technical skills while expressing my creativity.

My work approach is based on a combination of creativity and technical rigor. I strive to stay at the forefront of technological advancements while keeping in mind the importance of practical and functional solutions. My goal is to continue collaborating with companies and institutions to provide innovative IT solutions that make a real difference.

If you are looking for a computer engineer with in-depth expertise and the ability to tackle various technological challenges, I would be delighted to discuss how I can contribute to your project.
  • French

    Native or bilingual

  • Spanish

    Conversational

  • English

    Conversational

Can work on-site
Rouen (up to 50km), Paris (up to 20km)

Experience

  • Scor'Pion
    Fullstack Mobile & Cloud Developer
    ENTERTAINMENT AND LEISURE
    January 2026 - Today (7 months)
    Rouen, France
    Design, development, and deployment of a cross-platform application for managing scores and tournaments for board games and sports.

    Front-End & Mobile: Development of the mobile application (iOS / Android) and the administration interface with React and Tailwind CSS, focusing on a fluid user experience (UX) and compliance with accessibility standards.

    Back-End & Serverless: Architecture and writing of server-side business logic using Cloud Functions (Node.js / TypeScript) to automate asynchronous tasks, secure data, and manage third-party integrations (Stripe, geocoding).

    Data Management: Modeling and integration of the Firebase/Firestore real-time database (index management, strict security rules, offline synchronization).

    Internationalization (i18n): Dynamic application translation and management of URL segments ([lang]) adapted for Next.js / App Router architectures.

    CI/CD & Quality: Resolution of complex bugs related to the component lifecycle (state management, React Hooks) and optimization of startup performance (reduction of technical debt on Android/Kotlin and iOS).
    SwiftUI Kotlin Firebase Node.js React.js
  • OnParty
    CTO & Full-Stack Developer
    ENTERTAINMENT AND LEISURE
    July 2025 - January 2026 (6 months)
    Paris, France
    CTO and full-stack developer of a B2C / B2B event platform integrating ticketing, payments, and real-time features.

    Tasks & Responsibilities
    - End-to-end design and development of the OnParty platform
    - iOS mobile development (main app) and React web app
    - Implementation of a Firebase serverless architecture
    - Development and maintenance of Cloud Functions (payment, business logic, automations)
    - Integration of secure payments with Square
    - Management of ticketing, orders, and event access
    - Implementation of real-time features (user/event sync)
    - Setup of CI/CD and continuous deployment via Firebase Hosting
    - Technical choices, project structuring, and overall product supervision
    iOS React.js Firebase Node.js Mobile development
  • EssilorLuxottica R&D
    Malt logoOn Malt
    Full Stack Developer specializing in Client-Server Solutions
    RESEARCH
    October 2024 - April 2025 (6 months)
    Paris, France
    Creation of a Python server software and an Android mobile application developed in Kotlin, designed to interact smoothly and efficiently.
    The server software allows remote control of the mobile application by establishing direct communication between the two systems. This interaction relies on low-level sockets, ensuring fast and efficient data transmission, suitable for real-time environment needs. This system ensures reliable and bidirectional exchange, paving the way for numerous functionalities such as remote control, state synchronization, and information transfer with a high level of accuracy.
    Android Mobile Application Kotlin Mobile development Python

Reviews

5.0

Out of 3 ratings

A

Amandine

Développeur Full Stack spécialisé en solutions client-serveur - EssilorLuxottica R&D

Reviewed on 4/2/2026

As part of a research-focused project, Pierre developed software and an application with a connection between the two. Pierre is responsive, communication with him is very smooth. He was able to meet our needs and above all adapt to an unusual project. I recommend him without hesitation!
C

Cedric

INFINITY SPACE

Reviewed on 11/7/2022

Outstanding experience ! I highly recommend

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Education

  • Information Systems Architecture Engineer
    INSA
    2013

Skill set

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