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Valentin G.VG

Valentin G.

Mobile Developer | React Native | IOS & Android

€475/day
Grenoble, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Valentin

React Native / Expo Mobile Developer | iOS · Android · TypeScript · Laravel backend 📱

Do you have an app idea, or an existing app to evolve, and you want a contact person who delivers, not one who multiplies back-and-forth. I design reliable and production-ready React Native / Expo mobile applications, from idea to deployment on the App Store and Google Play Store.

My specialty: I also cover the back-end that powers your apps, with Laravel APIs. You have a single point of contact from mobile to server, instead of coordinating two providers.

Before development, I spent ten years in an elite unit of the French Army. There I learned to execute under pressure, to hold a goal without deviation, and to speak as well to the decision-maker as to the field operator. This is exactly what an app project requires: framing, prioritizing, delivering, and remaining clear with non-technical stakeholders.

Today, I am designing the mobile application for temporary workers in the Actual group, a business app in production, used in the field.

Concretely, I will deliver an iOS and Android app from prototype to store deployment, with a proprietary Laravel back-end, and clear management: framed objectives, met priorities, direct communication.

First discussion to frame your needs? Contact me, I respond quickly. Let's schedule a video call and see concretely how to move forward.
  • French

    Native or bilingual

  • English

    Conversational

Can work on-site
Grenoble (up to 20km), Lyon (up to 20km), Paris (up to 10km)

Experience

  • Groupe actual
    Full Stack Developer
    HUMAN RESOURCES
    July 2024 - Today (2 years and 1 month)
    Toulouse, France
    🔧 Development and maintenance of a management platform for temporary work, serving two audiences: agencies via a web back-office, and candidates via a mobile application.
    Functional scope:

    📊 Agency Back-office: management of candidates, availability, documents, contracts, assignments
    Candidate Mobile App: personal information, assignment history, contract signing, withdrawal requests

    🚀 Stack & Technical Responsibilities:
    Backend (Laravel):

    Architecture with Form Requests, Events/Listeners, Notifications
    Asynchronous jobs with retry logic and timeout handling
    Eloquent modeling on complex relationships (agencies, candidates, assignments, documents)

    Mobile (React Native):

    State management with Zustand
    Forms with Formik + Zod validation
    Navigation with React Navigation
    Animations with Reanimated
    Push notifications via Customer.io
    Secure management of sensitive data (Secure Storage)

    Web (React):

    Administration interfaces for agency and candidate management
    State management and data fetching with TanStack Query
    Complex multi-step forms
    REST API integration

    Expanded Role:

    Full autonomy over the development cycle (specifications → delivery)
    Contribution to technical discovery and architecture choices
    Mentoring and technical support for peers
    AI-assisted Sentry remediation workflow (error detection → Claude analysis → PR opening → Slack notification)
    React Native Developer Laravel React TypeScript PostgreSQL
  • ePack Hygiene / CHR Group
    Full Stack Developer
    RESTAURANTS AND FOOD SERVICE
    April 2024 - June 2024 (2 months)
    Brest, France
    🔧 Backend Development
    Using PHP with the Symfony framework to create and maintain robust web applications.
    Optimizing SQL queries to improve PostgreSQL database performance.

    🗄️ Database Management
    Administration and maintenance of PostgreSQL databases.
    Implementation of stored procedures and scripts to automate recurring tasks.

    📊 Monitoring and Analysis
    Configuration and use of Kibana for monitoring and analyzing application logs.
    Real-time data stream monitoring with Elastic.

    📬 Queue Management
    Setup and management of asynchronous messaging systems with RabbitMQ.
    Development of scripts to efficiently process messages from the queue.

    These experiences have allowed me to strengthen my technical skills and quickly adapt to new technologies in a dynamic environment.
    PHP MySQL Database Administration Symfony Agile Methodology
  • TheCodingMachine
    Project Manager
    DIGITAL AND IT
    November 2022 - April 2024 (1 year and 5 months)
    Lyon, France
    🔧 Hybrid role combining project management and full-stack development for custom web and mobile applications, in-house and fixed-price, using Agile methodology.

    💼 Pre-sales & Commercial Phase
    — Technical Quoting: estimation in man-days, scope breakdown
    — Development of quotes and commercial proposals
    — Client presentations: solution presentation, defense of technical choices, objection handling
    — Participation in sales meetings alongside business developers

    📋 Scoping & Specifications
    — Facilitation of scoping workshops with business stakeholders
    — Complete writing of specifications documents
    — Detailed functional specifications: user journeys, business rules, edge cases
    — Technical specifications: architecture, data model, API contracts

    🎯 Management & Client Relations
    — Steering committees, progress updates (weekly)
    — Management of change requests and scope/budget/deadline arbitration
    — Post-delivery support, client acceptance, bug fixing

    🚀 Stack & Technical Responsibilities:
    Backend (Laravel):
    — Design and integration of REST APIs
    — Service-oriented architecture
    — Eloquent modeling and complex queries
    — Asynchronous jobs and queue processing

    Web (React):
    — Administration interfaces and business applications
    — State management and data fetching
    — Complex forms and multi-step journeys

    Mobile (React Native):
    — iOS / Android applications
    — Navigation, state management, API integration

    Database:
    — MySQL, relational modeling, SQL query optimization

    👥 Team Coordination
    — Task assignment and prioritization
    — Technical support for developers
    — Team meetings, progress tracking, continuous improvement of practices

    🏭 Various intervention contexts: human resources & recruitment, aerospace & defense, health, manufacturing industry.
    TypeScript Laravel Nova Laravel Project Management React Native

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Education

  • Professional Title (TP) Level 5, Programming / Computer Developer, General
    Wild Code School
    2022
    Titre professionnel (TP) de niveau 5, Programmation / développeur informatique, général
  • Baccalaureate, Industrial Science and Technology
    Lycée Durzy
    2011
    Baccalauréat, Science et Technologie de l'Industrie

Skill set

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