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Freelance full-stack developer in Caen framing a business application

Freelance full-stack developer for UK and Ireland teams

I help design, structure and build bespoke web applications with logic clear and usage-led.

I build business software for UK and Ireland teams: custom web tools with logic, data, APIs, workflows and interfaces adapted to real usage.

Working frame

A readable method, with enough depth

A project moves like a system: understand the field, define a useful architecture, then build without losing the link with real usage. The aim is to keep things clear, even on technical topics.

Context Usage Priorities Delivery
01
Diagnosis
Frame
Context and stakeholders
02
Structuring
Prioritise
Impact vs effort
03
Execution
Deliver
Maintainable base

Services

Full-stack services for complex business contexts

I work where interfaces, data, APIs, rules and organisational constraints need to fit together cleanly.

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

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.

Diagnostic

Understanding your need: starting from the field, not from features

Before proposing a technical solution, I clarify who will use the tool, in what context, with what expectations and what constraints.

Analyse context before any decision

I start by observing stakeholders, usage, constraints and interactions to avoid technical answers disconnected from reality.

  • Reading the business need and usage context
  • Identifying concrete friction points
  • Shared vision before launch

Formulate a real and prioritised need

A project moves faster when you separate the essential from the secondary. I help turn a broad intention into actionable objectives.

  • Prioritising useful actions
  • Clear trade-offs between impact and effort
  • A readable roadmap for all stakeholders

Design a response suited to the field

The tool is not an end in itself. It serves a public, an organisation and precise objectives.

  • Simple journeys for end users
  • Technical choices proportionate to the need
  • A reliable and maintainable base over time

Experience

Credibility markers from demanding environments

Field experience on topics with industrial constraints, multi-stakeholder coordination and complex technical needs.

Schneider Electric project — Circular Certified

During my work-study placement in agency, I contributed to a project around an e-commerce platform dedicated to refurbished equipment.

  • Understanding business stakes: product lifecycle, refurbishment, traceability
  • Contributing to the redesign of the product returns management system
  • Improving flows between application components with a reliability logic
  • Working on a Symfony, API Platform and e-commerce base

Horsplace R&D — e-ink solution for the equestrian sector

I led an R&D project involving a proxy API, international technical coordination and hardware/software interactions.

  • Coordination with engineers in China
  • Working on distributed system constraints
  • Managing interactions between physical and application components
  • Structuring technical decisions in an evolving context

Method

My method: diagnose, structure, develop

I apply to web development a method derived from territorial diagnostics: analyse, prioritise, then design a solution suited to real usage.

Context diagnostic from DEJEPS DPTR

Trained in territorial diagnostics through the DEJEPS Project, Territory and Network Development programme, I first analyse the environment, usage and constraints.

  • Identifying the stakeholders involved
  • Understanding the real needs of target audiences
  • Qualifying constraints before deciding

Project framing and steering

I organise the project around clear priorities to align business need, user experience and technical execution.

  • Structuring the project from the need
  • Coordinating stakeholders
  • Continuous adaptation to field constraints

Useful design and development

I design and develop solutions that stay simple to use, useful day to day and maintainable over time.

  • Direct link between usage and implementation
  • Features chosen to solve a concrete problem
  • Clear architecture to evolve the product

Need a project partner

Set a solid frame before starting development

The first exchange is to clarify business stakes, constraints and usage to prioritise correctly and build a useful solution.

Difference

What sets me apart from purely technical profiles

I systematically connect field reality, project logic and technical solutions to produce a useful and durable result.

  • I do not start from technology. I start from context and usage.
  • I do not look to add features. I look to solve a concrete problem.
  • I combine need analysis, project structuring and full-stack development.
  • I bridge the gap between business teams, users and technical constraints.

In practice for your project

  • A clarified need before execution.
  • A simple and concrete steering frame.
  • A solution designed for real usage.
  • An application that is maintainable and evolvable over time.

Process

A simple process to stay on track

The project advances in short steps, with a reasonable scope and choices that serve understanding, business usage and application maintenance.

01

Etape 01

Diagnosis and priorities

We clarify the organisation, users, business constraints and the concrete role of the tool in your processes.

02

Etape 02

Development and business logic

I design and build features, business logic and the useful algorithmic parts of the project on a clear, maintainable base.

03

Etape 03

Clean launch

The application ships with a solid technical base, framed usage and a structure you can evolve afterwards.

Based in Caen

Local understanding, remote collaboration

I work from Caen with organisations in Normandy, France and internationally when the project fits.

  • Quickly understand the context of an organisation and its concrete constraints.
  • Set a clear working frame for remote collaboration: structured kickoff, regular check-ins, documented deliverables.
  • Fully fluent in English — all deliverables, documentation and exchanges in English.

Common questions

Do you work remotely with UK and Irish teams?

Yes. I work fully remotely with teams in the UK and Ireland. Distance does not change the method: structured kickoff, regular check-ins, documented deliverables and all communication in English.

Are you available for contract work in the UK?

Yes. I am available for freelance and contract engagements with UK and Irish companies, either on a project basis or for ongoing development work. I am based in Normandy, France, and operate on a remote-first basis.

Can you build a complex business application?

Yes. I can frame, design and build a business application with business rules, data, user roles, workflows, APIs and interfaces adapted to team usage.

Do you work with industry and local authorities?

Yes. My background combines full-stack development, industrial projects and territorial coordination. I am comfortable in environments where technology has to deal with human, business and organisational constraints.

Can you take over an existing tool?

Yes. I start by understanding the current behaviour, business constraints, user pain points and priorities before proposing an evolution or technical rebuild.

Contact

Have a business tool to frame, build or take over?

The simplest starting point is context: who uses the tool, which business rules matter, which constraints exist and what must be reliable from day one.

The information is only used to reply to your project request. No marketing list, no resale.