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Valentin G.VG

Valentin G.

React Native Mobile Developer / Expo

€550/day
Grenoble, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Valentin

Every mobile application is a mission to be accomplished with strategy and precision. A former member of an elite unit of the Army, I apply this rigor to my work as a React Native / Expo mobile developer. I currently design the mobile application for Actual's temporary workers, and I transform your ideas into high-performing iOS and Android applications, from prototype to deployment. Capable of handling the back-end that powers them, Laravel or Node / TypeScript API, I offer you a single point of contact from mobile to server. Professional, responsive and attentive, I am the reliable ally to lead your project to success.
  • 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 (1 year and 11 months)
    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 handling 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 architectural 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 the performance of PostgreSQL databases.

    🗄️ 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
    Setting up and managing asynchronous messaging systems with RabbitMQ.
    Developing 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, on a staffing and fixed-price basis, using Agile methodology.

    💼 Pre-sales & commercial phase
    — Technical costing: 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 drafting of specifications
    — Detailed functional specifications: user journeys, business rules, edge cases
    — Technical specifications: architecture, data model, API contracts

    🎯 Management & client relations
    — Steering committee meetings, progress reports
    — Management of change requests and scope/budget/deadline trade-offs
    — 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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