Freelancer profile translated to English.

Description

Symfony / API Platform Developer — Business Applications, APIs & Legacy System Overhaul

Do you have an internal tool to create, a business application to structure, an API to develop, or a Symfony project to properly take over?

I work on projects where simply "adding features" isn't enough: it requires understanding the business, clarifying rules, structuring data, and delivering a tool that teams can genuinely use.

My core areas of intervention:

• Custom business application development with Symfony, PHP, and API Platform;

• Design of REST APIs, back-offices, workflows, roles, validations, and dashboards;

• Legacy system takeover, progressive refactoring, technical debt correction;

• Functional and technical scoping before development;

• Docker deployment, documentation, and user support.

I have worked on projects for industrial, associative, and business contexts:

• Schneider Electric: e-commerce and product return management redesign;

• Horsplace: connected solution with e-ink display and proxy API;

• Kosa: mobile-first field application with geolocation data and validation workflow;

• Doc2Sail: business application for document management in regatta organization.

What sets me apart:

I don't start with code; I start with usage. My background in project coordination and popular education allows me to quickly understand field constraints, users, responsibilities, and the real pain points behind a request.

Possible services:

• Business application audit or scoping;

• Symfony / API Platform MVP;

• Business API or back-office;

• Legacy project takeover and stabilization;

• Internal tool for SMEs, associations, local authorities, or business teams.

Objective: deliver a clear, maintainable, documented, and genuinely used tool.

Industry field of expertise

Languages

French
Native or bilingual
English
Fluent

Workplace preferences

Can work on-site

Caen (up to 50km), Paris (up to 50km), Rennes (up to 50km), Rouen (up to 50km), Le Havre (up to 50km)

Optimum Circle
Freelance Symfony Project
DIGITAL AND IT
February 2026 - Today (6 months)
Caen, France
→Objective:design a business application for field data collection within a citizen science project, conceived for mobile use and limited connectivity contexts.

→ Challenges:structuring the collection of naturalist data, ensuring the reliability of validation workflows, managing geolocation data, and establishing a robust technical foundation for future offline functionality.

→ Technical Stack
Symfony 7.4 · API Platform · PHP · JWT · PostgreSQL · PostGIS · Docker · CI/CD

→ My Missions
Project scoping and technical architecture definition
Design of a secure business API for field observation collection
Structuring of geolocation data and business repositories
Implementation of validation and moderation workflows
Development of a back-office for business teams
Preparation of a reliable and scalable technical foundation
Integration of mobile-first and low-connectivity constraints
Contribution to a product roadmap focused on offline capabilities and deferred synchronization

→ Result:a solid application base, designed for real-world field constraints and capable of supporting the development of a citizen science tool genuinely usable by teams.
Git Symfony PostgreSQL EasyAdmin API Platform
Sparrow Développement
Web Developer
DIGITAL AND IT
October 2022 - July 2025 (2 years and 10 months)
Caen, France
→ Objective:assist clients in the design and development of custom digital solutions, ensuring a direct link between business needs, functional scoping, and technical implementation.

→ Challenges:translating sometimes heterogeneous needs into reliable and adapted tools, maintaining fluid communication with clients, and securing the various phases of design, development, and deployment.

→ Technical Stack
Symfony · API Platform · Next.js · PHP · JavaScript · Docker · CI/CD

→ My Missions
Analysis and scoping of business needs with clients
Design of adapted functional and technical solutions
Development of custom web applications
Participation in testing, acceptance, and deployment phases
User support and training
Direct interface with clients throughout projects
Contribution to the improvement of technical environments and delivery workflows
→ Notable Projects

Schneider Electric: redesign of an e-commerce and product return management system as part of the Circular Certified program
Horsplace: R&D and development of a connected e-ink display solution, including the design of a proxy API and coordination with an international technical team

→ Result:comprehensive experience in projects managed under real-world conditions, at the intersection of client relations, business scoping, and custom development.
Symfony Web Project Management API Platform Research and Development Needs Analysis
Eclaireuses Eclaireurs de France (EEDF)
Project Animator
ENTERTAINMENT AND LEISURE
June 2020 - September 2021 (1 year and 3 months)
Caen, France
→ Objective:design and manage adapted stays for children and adults with disabilities, ensuring a secure, structured, and needs-appropriate environment for the accompanied individuals.

→ Challenges:organizing demanding human and logistical arrangements, coordinating teams, guaranteeing the quality of support, and adapting resources to field situations.

→ My Missions:
Design and operational organization of stays
Recruitment, training, and team coordination
Logistics management and securing field operations
Support for individuals and consideration of their specific needs
Structuring the work framework and responsibilities within teams
→ Result:development of a strong ability to understand complex human contexts, structure work organizations, and coordinate teams in demanding environments. A formative experience in managing complex contexts, which I now leverage to understand usage, scope needs, and design truly field-adapted tools.
Team Coordination Project Management Team Management Recruitment Educational Project Management

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Master Web Digital Project Manager
My digital school Caen
2025
- Définition de stratégies digitales orientées impact et durabilité - Analyse des besoins clients et diagnostic stratégique - Pilotage de projet en mode Product Owner (de l’idée au déploiement) - Rédaction et supervision de cahiers des charges fonctionnels et techniques - Coordination d’équipes pluridisciplinaires (dev, design, marketing) - Gestion de projet : budget, planning, qualité - Déploiement de solutions web et suivi des performances - Mise en place de veille technique et réglementaire
Professional Title: Application Designer Developer
My digital School caen
2023
- Développement d’applications web sécurisées (frontend + backend) - Conception d’architectures logicielles modulaires et maintenables - Modélisation et gestion de bases de données (SQL / NoSQL) - Développement de logique métier et d’API - Analyse des besoins et conception de solutions techniques - Mise en place de tests, documentation et déploiement - Contribution à des projets en environnement DevOps

Check out Marin's education

Marin Davies De Gélis

Web Developer | Symfony | Analysis & Scoping

About Marin

Symfony / API Platform Developer — Business Applications, APIs & Legacy System Overhaul

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