Field and coordination
Before tech, I worked in socio-cultural work and territorial project coordination, especially at UFCV Normandie.
About
A full-stack developer who starts by understanding the field
BHN logic is my freelance development activity based in Caen. I design business applications, internal portals, APIs and web tools for organisations that need useful, reliable solutions their teams can understand.
Who I am
Marin Davies de Gélis — full-stack developer and project coordinator
Before building applications, I coordinated territorial projects — volunteer networks, adapted stays, training programmes — in environments where human and organisational complexity is just as present as technical constraints.
The DEJEPS DPTR trained me to read a context: identify stakeholders, understand real usage and qualify constraints before acting. That is the method I now apply to web development.
I can work as a full-stack developer on a Symfony application, but also as a partner able to audit a team workflow, structure a vague need and set priorities before the first ticket is opened.
What I can do concretely
- Develop a complex business application from end to end.
- Audit a team workflow and identify friction points.
- Turn a vague need into actionable priorities.
- Coordinate stakeholders with different constraints and cultures.
- Connect business teams, users and development work.
Profile
A dual culture: field coordination and development
My path does not start only from code. It also starts from understanding the stakeholders, usage and constraints around a project.
Territorial diagnosis
The DEJEPS DPTR gave me a method for reading needs: stakeholders, usage, constraints, priorities and expected effects.
Web development
I then moved that approach into full-stack development: understand the problem before designing the tool.
Demanding projects
My experiences around Schneider Electric, Horsplace and Doc2Sail show this link between business, coordination and development.
Expertise
What I bring to a project
I can intervene as a developer, but also as someone able to structure the need before implementation.
Full-stack development
I work on the visible interface and on server-side logic: screens, APIs, business rules, data and integrations.
- Symfony, PHP, API Platform and modern web ecosystems
- Front-end work focused on usage, readability and maintainability
- Technical bases designed to evolve without closing in
Complex business applications
My natural field is tooling where rules, stakeholders, workflows and organisational constraints need to be understood.
- Process, state, role and validation modelling
- Internal interfaces for recurring usage
- Framing before development to limit bad surprises
Industry and local authorities
I have a particular interest in contexts where digital tools must serve an operational, territorial or industrial reality.
- Traceability, product flows and technical coordination
- Territorial diagnosis and understanding of local stakeholders
- Ability to connect human, business and technical constraints
Stack
A pragmatic web stack
I choose tools according to the actual need: business logic, maintainability, integrations, deployment and ability to evolve.
SymfonyPHPAPI PlatformJavaScriptTypeScriptAstroTailwind CSSDockerFrankenPHPMercureSQLPWA
What I try to avoid
- A technically correct tool that teams cannot understand.
- An architecture that is too heavy for the real need.
- Features added before usage has been clarified.
- A delivery that leaves the organisation dependent on opaque behaviour.
Domains
The subjects where I am most relevant
These pages detail the contexts where my full-stack and field-focused approach is most useful.
Full-stack web development
Front-end, back-end, API and business logic design and development to create reliable web tools that are useful day to day.
- Symfony, PHP, APIs and modern front-end interfaces
- Maintainable architecture adapted to the project's constraints
- A direct link between business needs, users and technical choices
Complex business applications
Custom application development to manage workflows, data, roles, validations, dashboards and automations.
- Modelling business rules and user journeys
- Managing roles, data, validations and business states
- Interfaces designed for demanding recurring use
Web solutions for industry
Applications and internal portals to track products, organise returns, secure exchanges and structure business flows.
- Traceability, product lifecycle and operational tracking
- Internal interfaces adapted to team constraints
- APIs and integrations between application components
Digital tools for local authorities
Web tool design to coordinate stakeholders, track requests, structure information and simplify team workflows.
- Understanding field constraints and local stakeholders
- Portals, forms, case tracking and internal interfaces
- Clear framing before development to avoid detached tools
Web development for nonprofits and associations
Bespoke web tools for nonprofits: member management, volunteer portals, project tracking, stakeholder coordination.
- Direct experience of French nonprofit operations (UFCV, EEDF)
- Tools designed for mixed volunteer/staff teams with turnover built in
- A durable, owned alternative to ever-rising SaaS subscriptions
Freelance Symfony developer in Caen
Symfony development for business web applications, API Platform, internal tools and back-offices shaped around SME, nonprofit, public-sector or industrial constraints.
- Symfony 5.4 to 7 applications with readable architecture
- API Platform, Doctrine, PostgreSQL or MySQL depending on context
- Maintenance, project takeover and progressive evolution
Bespoke Symfony and API Platform API development
Documented, secure and maintainable business APIs to connect tools without spreading business rules across several applications.
- Readable API contracts for business and technical teams
- Security, roles, validation, serialization and OpenAPI documentation
- Integrations with web frontends, internal tools or partner systems
Custom back-office development for business tools
Business administration interface design for content, cases, roles, validations, exports and dashboards.
- Administration interfaces adapted to business rules
- Roles, validations, exports and history tracking
- Maintainable back-office documented for day-to-day use
Technical audit for web applications, Symfony and business tools
Code, architecture, security, performance, technical debt and maintainability analysis to set priorities before moving blind.
- Risk-oriented review: security, debt, dependencies, architecture
- Useful before Symfony project takeover or business application redesign
- Prioritised improvement plan understandable by decision-makers
Bespoke business application for SMEs
Business application development for SMEs that need better tracking of cases, statuses, validations, data and responsibilities.
- Progressive replacement of Excel or scattered tools
- Workflows, permissions, dashboards, exports and history
- Web application designed around how the company really works
Exchange
Do you have a business tool to frame or take over?
The simplest starting point is context: who uses the tool, which business rules matter, what constraints exist and what must be reliable from day one.