You're seeing this page as if you were . The main menu is still yours, though. Exit from immersion
Emilien CossonEC

Emilien Cosson

Supermalter

Développeur Web fullstack - Expert SvelteKit

€350/day
9 projects
Le Mans, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
Back to original language

About Emilien

Développeur passionné, je me spécialise dans la création d'applications innovantes. Ma maîtrise des langages de programmation tels que JavaScript, C, Java, ainsi que des frameworks web comme SvelteKit, Vue et Spring, me permet de concevoir des solutions fonctionnelles, performantes et de haute qualité. Mon intérêt pour le web design et ma curiosité technique m’aident à développer des produits modernes, innovants et conformes aux plus hauts standards. Fort de mon expérience dans l’industrie logicielle, j’ai lancé ma propre aventure entrepreneuriale pour offrir des solutions sur mesure aux besoins des professionnels et des utilisateurs, en simplifiant leur quotidien. Je suis convaincu que l’étude approfondie d’un projet est une étape clé dans la réussite de toute initiative numérique.


Développement d'applications web - applications mobiles - sites Internet - client lourd Desktop


Etapes clés : Analyse des besoins, conception, développement, test, livraison, hébergement, maintenance


Mots clés : rigueur, expertise, résolution de problèmes, fonctionnel, qualité, performance.


Mes technologies de prédilection :
Svelte+SvelteKit / Vue.js
Java (Spring boot) / Node.js
  • French

    Native or bilingual

  • English

    Fluent

Can work on-site
Le Mans (up to 50km)

Experience

  • AKELIO
    Malt logoOn Malt
    Development, maintenance, and improvement of the GAPP software for Guest ADOM
    DIGITAL AND IT
    January 2026 - February 2026 (1 month)
    Le Mans, France

    Project Overview

    GuestAdom is a property management and booking platform for vacation rental owners and managers, handling reservations, listings, guest communications, onboarding, and financial management across multiple channels.

    Key Accomplishments


    Email Marketing Automation & Nurturing

    Implemented automated guest onboarding sequences with retroactive scheduling and date-based logic

    Developed migration scripts and a datetime testing/debugger framework

    Managed edge cases across onboarding stages and coordinated technical-business alignment
    Skills: Email automation, scheduling algorithms, workflow orchestration, test/debug, business logic validation

    Financial Data Export – Tourism Tax (TDS)

    Built Excel export for tourism tax with dynamic formulas across Portal Hôte, GuestAdom Admin, and Admin portal

    Integrated CRG for data consistency and delivered documentation/test cases
    Skills: Full-stack dev, financial calculations, Excel export generation, data mapping

    Mandate & Reservations Registry Exports

    Developed 67-column export system with complex status logic and priority rules

    Created QA checklist and validated comprehensive business rules
    Skills: Data modeling, business rule implementation, multi-column export, QA/testing, documentation

    Business Skills


    Requirements analysis, stakeholder communication, strategic decision support, full SDLC (analysis → debugging → documentation)

    Metrics


    Features Implemented: 4 major | Completed Tickets: 6 | Platforms/Integrations: 3+

    Complex Data Models: 2+ (67+ columns) | Bug Fixes/Improvements: 3 | Refactoring: 1 | In-Progress/Testing: 2
    Spring boot Vue.js Java MariaDB Web Development
  • AKELIO
    Developer
    DIGITAL AND IT
    April 2023 - August 2024 (1 year and 4 months)
    Le Mans, France
    Insurance Wholesaler:
    • Development of a new car insurance product in collaboration with 2 developers (quotes, contracts, claims, endorsements, wholesalers, brokers, guarantees)
    • Development of a new "Château and Fine Homes" home insurance product, API integration (ModulR)
    • Development of PDF, Word, Excel exports

    Acollab, collaborative platform:
    • Technical migration of several pages from Java Server Faces to Vue/Spring Boot technologies
    • Redesign of the Project Management module (Tasks, Kanban, Gantt, Calendar)
    • Fixes for functional production bugs
    • Production deployments
    • Development of custom features for a client on the Calendar module.
    • Development of PDF exports

    Platform to promote salary well-being:
    • Implementation of automated integration tests with Spring Boot and RestAssured.
    • Fixes for functional bugs
    Spring boot Vue.js JavaServer Faces (JSF) Java JavaScript MySQL
  • Num:info
    Developer
    SOFTWARE PUBLISHING
    September 2024 - Today (1 year and 9 months)
    Design of Websites and web applications
    Development of Desktop software, web and mobile applications
    Maintenance, hosting, consulting

Reviews

5.0

Out of 1 rating

C

Christophe

AgileValue GmbH

Several weeks project

-

Reviewed on 9/15/2025

Emilien adapted to our project remarkably quickly. He is meticulous, curious, and open-minded, and his ideas made valuable contributions to our work.

Recommendations

Guillaume LouvelGL
EG
Lucas M.LM
Guillaume Louvel and 2 other people have recommended Emilien

These freelancer profiles also match your criteria

AgathaA

Agatha Frydrych

Backend Java Software Engineer

4.7

(3)

2

BaptisteB

Baptiste Duhen

Fullstack developer

4.6

(4)

5

AmedA

Amed Hamou

Senior Lead Developer

4

(2)

7

AudreyA

Audrey Champion

Web developer

4.3

(3)

4

Education

  • BUT informatique
    IUT de Laval / Le Mans Université
    2024
    Réaliser le développement d’une application - Gérer des données de l’information - Administrer des systèmes informatiques communicants complexes - Gérer des projets informatiques - Optimiser des solutions informatiques - Travailler dans une équipe informatique

Skill set

Categories