SENIOR SOFTWARE ENGINEER · FREELANCE · RENNES

I design business software that is built to stand the test of time.

Full stack Java, PHP and Javascript development, DevOps, distributed systems architecture, information system modernisation and AI orchestration: I step in where technical complexity must become a business advantage.

Assign me a mission Explore my work
01
20+ years programming
02
Freelance since 2016
03
Based in Rennes
04
Working throughout France

EXPERIENCE GAINED WITH PUBLIC AND PRIVATE ORGANISATIONS

Reference logo for https://www.numerique.gouv.fr/dinum/ 🔗
Reference logo for https://www.economie.gouv.fr/dgfip 🔗
Reference logo for https://www.orange.fr 🔗
Reference logo for https://www.airbus.com 🔗
Reference logo for https://www.atos.net 🔗
Reference logo for https://www.solocal.com 🔗
Reference logo for https://vpauto.fr 🔗
Reference logo for https://www.covage.com 🔗

01 / MISSIONSWHEN TO CALL ME

You need a developer who understands the business and masters the system.

You need someone who can understand the business, read the existing system and make technical decisions that will still hold after production launch.

MISSION / 01

01

BUILD

Turn a complex business process into a reliable application.

Design · domain modelling · Symfony · API Platform · web interfaces · databases

SCOPE READY
MISSION / 02

02

MODERNISE

Evolve a legacy application that slows teams down or weakens production.

Audit · system mapping · progressive migration · architecture redesign · performance

SCOPE READY
MISSION / 03

03

HARDEN

Keep architecture, deployments and observability aligned as the system grows.

Distributed systems · asynchronous processing · Docker · CI/CD · monitoring · resilience

SCOPE READY
MISSION / 04

04

AUGMENT

Integrate AI into a real business process, without gimmicks.

AI agents · RAG · MCP · local models · automation · orchestration · supervised loops

SCOPE READY

02 / SCOPEDEVELOPMENT & ARCHITECTURE IN RENNES

Develop an information system that can genuinely evolve.

Based near Rennes, I help companies and public-sector organisations in Brittany design business applications, architect distributed systems and progressively modernise their information systems. I also work remotely throughout France.

WORKING AREARennes metropolitan area · Brittany · France remotely
01

Full stack PHP and Symfony application development

A business application is more than an interface or an API. It must translate sometimes complex rules, secure data and remain understandable to the teams who will evolve it. I cover the complete chain: domain modelling, PHP Symfony, Java Spring boot, Javascript backend, APIs with API Platform, JavaScript or TypeScript interfaces with React, Vue or Angular, hybrid mobile applications, databases, tests and production launch.

This full stack approach suits B2B platforms, internal tools, data portals and operational software that must communicate with the existing information system. Components are chosen according to the business, maintainability and the actual workload.

Explore full stack expertise
Illustration of the layers of a full-stack application, from its interface to its production infrastructure.
02

Software architecture and distributed systems

When several applications, APIs, services and data sources must cooperate, the challenge is no longer just developing a feature. Responsibilities must be defined, exchanges controlled and failures anticipated. I architect distributed systems around clear contracts, event-driven flows, asynchronous processing and usable observability.

The objective is not to multiply microservices. It is to build a proportionate architecture that can absorb growth, limit side effects and remain operable by the teams.

Illustration of distributed services exchanging data within a resilient and observable architecture.
03

Modernising information systems and legacy applications

Modernising an information system does not mean rewriting everything. I begin by mapping flows, dependencies, sensitive data and production constraints to identify a realistic path. Transformation can then progress in stages: extracting a scope, creating APIs, upgrading Symfony, securing deployments or evolving the data model.

This progressive approach reduces business risk, protects service continuity and delivers value before the modernisation programme is complete.

Illustration of a legacy system being progressively transformed into a modern architecture without interrupting its flows.
04

Architecture for useful AI orchestrators and agents

AI becomes relevant when it fits into a controlled process. I design orchestration architectures that connect models, agents, RAG, MCP servers, internal tools and business data, with explicit limits and human supervision.

These systems can support analysis, document retrieval, deliverable production or selected development loops. They are assessed like any other information-system component: output quality, security, traceability, operating cost and the ability for people to take back control.

Illustration of AI orchestration connecting models, knowledge and business tools under human supervision.

03 / PRINCIPLE

Complexity is not the problem.
Uncontrolled complexity is.

My work is to make a complex system understandable, maintainable and operable. I do not look for the most impressive architecture, but for the one that serves the business with the least debt and the most continuity.

Antoine DarcheSenior software engineer

04 / LOGBOOKSELECTED WORK

A few systems placed in orbit

View all work

05 / TRAJECTORYMETHOD

One mission, four control points

  1. 01

    UNDERSTAND

    Business, constraints, users, risks and existing systems.

  2. 02

    MAP

    Flows, data, dependencies, technical debt and transformation path.

  3. 03

    BUILD

    Incremental development, tests, regular demos and useful documentation.

  4. 04

    HAND OVER

    Production launch, monitoring, support and team autonomy.

I can join an existing team, own a scope independently or support an architecture decision.

06 / CAPABILITIESFOCUSED EXPERTISE

The full chain, from business to production.

A technical foundation selected to last, without turning the homepage into a technology inventory.

View all skills
01

ENGINEERING

PHP · Python · Java · JavaScript · TypeScript · Symfony · API Platform · React · Vue · Angular · hybrid mobile apps

02

ARCHITECTURE

DDD · distributed systems · APIs · events · resilience

03

DATA

PostgreSQL · MySQL · Redis · Elasticsearch · vector databases

04

PRODUCTION

Docker · Kubernetes · CI/CD · Linux · monitoring

05

APPLIED AI

RAG · MCP · agents · local models · automation · orchestration · loops

Supervised agent or development loops: controlled automation, never a magical promise of total autonomy.
Portrait of Antoine Darche, senior freelance software engineer in RennesAD / RENNES

07 / OPERATORABOUT

Behind the system, one direct point of contact.

I am Antoine Darche, software engineer and founder of Life in the Cloud. I have been programming since my teens and freelancing since 2016.

With a MIAGE background, I enjoy projects where understanding the business matters as much as code quality. Based near Rennes, I work on site in Brittany or remotely throughout France.

My role does not stop at producing code: I make decisions easier, architecture clearer and help teams retain control of their system.

  • Direct communication
  • Technical and business vision
  • No sales middleman
Explore my background

08 / INTAKENEW MISSION

Do you have software to build, an existing system to modernise or an architecture to clarify?

Tell me about the context, even if the need is not perfectly defined yet. One first conversation is often enough to identify the right path.

Open a discussion Send an e-mail
DOSSIER / NEWAntoine Darche

Rennes / France

On-site or remote

Waiting