Curriculum vitaeLead developer

Gaël Demette

Lead developer & mentoring

From PHP to Rust by way of Node and Vue/Nuxt: hands-on throughout. Trainer of engineers at BSc and MSc level.

Essonne, France

Last update, Sep 2026

A technical director of 34, but a developer first. My first open-source contribution was in 2007, at 14, to get my maths homework done faster. Self-taught by temperament, I have never stopped writing code.

From PHP to Rust by way of Node, Vue/Nuxt and Deno: fifteen years of uninterrupted practice, leadership years included.

I have also trained engineers at BSc and MSc level, and I think teaching is the best way to check you actually understood.

Professional experience

Presidentadnap

Mission-driven company in the social and solidarity economy. Technical leadership of the company. Support for digital sovereignty

Public AI usage policy, with three deployment tiers: business service excluding training on submitted data, sovereign inference hosted in France, and self-hosted open-weight models down to air-gapped environments.
Declared agent surface on my own systems: read-only MCP server, llms.txt index and capability descriptor, with a versioned access policy that explicitly excludes personal content.

Infrastructure and cost optimisationAroma Zone
Six months on transverse concerns: monitoring, infrastructure cost reduction, GCP and Azure.
Safeguarding reports platformFrench social affairs ministries
Support for regional health agencies tracking reports concerning vulnerable adults.

Rust Nix Kubernetes Gitlab Open Source Management Budget management Vendor management Project management Pulumi Deno VueJS/Nuxt PostgreSQL Redis TypeScript Linux Claude Code MCP AI-assisted development

CTOCashway

Part-time

Rewrote a production system from Python to Rust, with the scope revised following an audit.
Took over a product with none of its original team available: audit, reverse engineering and written documentation.
Built the non-regression metrics that framed the rewrite.

Pulumi Vendor management Rust Python PostgreSQL Linux Observability AI-assisted development

PresidentQonfucius

Up to 14 employees and ~€1M revenue. Technical leadership of the company.

Founded to build a team from zero: 14 employees at its peak, low turnover, fully remote from day one, and revenue peaking at around €1M in 2022.
Transitional technical leadership
Worked on the Foncia group's ERP: raising code quality, and taking part in the team's technical debates and trade-offs.
Audits & consulting

e-ChauffeurFrench Ministry of Armed Forces
Real-time tracking of Armed Forces drivers through cellular data tracing, on the model of an Uber without the payment layer.
NodeJS VueJS/Nuxt MongoDB
Transverse DevOps infrastructureFrench Ministry of Armed ForcesLead DevOps
Deployed the incubator's software onto in-house infrastructure hosted at Scaleway, and supported the development teams.
carrefour.fr rebuildCarrefour
A roughly six-month engagement rebuilding the site.
Incubateur des TerritoiresANCTLead Tech
Deployed the incubator's software onto infrastructure hosted at Scaleway, and supported the project teams.
Offline cloudFrench Ministry of Armed Forces
Evaluation, benchmark and proof of concept for a cloud offering that runs disconnected from the internet.
StargateFrench Ministry of Armed Forces
Access management for defence bases. A CI pipeline producing a self-contained archive, for deployment with no internet connection.
NodeJS ReactJS MongoDB
E-commerce platformInVivo
A roughly six-month e-commerce engagement.

Vendor management Project management Kubernetes Terraform/OpenTofu Gitlab Github Support Budget management Management Training Remote work Open Source VueJS/Nuxt PostgreSQL Redis ArangoDB Directus TypeScript Linux Observability Agile Microservices TDD

CTOHungryUp

Very high availability of the application, with zero downtime.
Led a technical team of fewer than five people.
System and application architecture, APIs and the critical features, up to a substantial scaling capability.
Provisioning benches for Android tablets and devices via GenyDeploy; AWS Elastic Beanstalk infrastructure.

NodeJS Gitlab EmberJS Management Budget management Recruitment Project management MongoDB Training Linux

Lead DeveloperAdrenaline Hunter

Built a new product with Symfony.
Technical coordination with the product and marketing teams.

PHP Symfony Github

Web Campus Lab Manager & lecturerSupinfo

Ran the web Campus Lab and taught students on campus.

Training

Self-employed and freelancer

Training for engineers BAC +3 to BAC +5 (Java EE and Web)

Training MySQL NodeJS PHP PrestaShop Github Remote work

Volunteering & commitments

Homework support

Supporting young people with their homework, from primary school to the final year of secondary.

MemberMouvement Impact France

Member of the social and solidarity economy interest group.

Volunteer MemberRéseau Entreprendre 91

Startup mentoring

Mentored two startups, a construction-industry ERP and a passwordless authentication product, as a sparring partner to surface their blind spots.

Coaching Mentoring

Volunteer Trainerassociation "Le lien : l'informatique & nous"

Training people affected by digital illiteracy.

French, native language
English, technical

Recommendations

Recommendations published on LinkedIn

Sep 2026clientwritten in French

Gaël se distingue par sa grande polyvalence technique et sa capacité à intervenir sur des sujets variés, au-delà de son périmètre de développement habituel. À l'aise avec différentes technologies et les problématiques d'architecture, il sait investiguer les sujets complexes et trouver des solutions pragmatiques.
Il n'hésite pas à questionner les choix techniques ou organisationnels lorsqu'il estime qu'ils peuvent être améliorés, toujours dans l'intérêt du produit. Force de proposition, il apporte un regard critique et constructif aux réflexions de l'équipe et contribue ainsi à faire progresser les solutions et les pratiques.

Aurélie DroulersCheffe de projet SI, Direction du numérique des Ministères Sociaux (DNUM)

context: Safeguarding reports platform @ adnap

Sep 2026direct manager

Gaël was one of the first freelancers I hired at the FabNum, initially as a full-stack developer on a single project.
Over the three years we worked together, he grew into a transversal technical role, notably building the DevSecOps environment used by all our projects, and bringing several great people into the team. I would happily work with him again.

Fred BardolleDirecteur, Fabrique Numérique (Ministère des Armées)

context: Transverse DevOps infrastructure @ Qonfucius

Mar 2016direct managerwritten in French

Ayant recruté et encadré Gaël pendant plus d'un an en tant que responsable technique chez IZEOS, puis collaboré avec lui sur des missions freelance, je peux affirmer qu'il est très rare de trouver un développeur Tech Enthusiast aussi pointu et compétent.
Gaël est soucieux des bonnes pratiques, avec toujours un cran d'avance sur les nouvelles technos. Mais, plus important encore, il est ouvert à la discussion et aux avis divergents.
Gaël est le Lead Dev que toute startup tech rêverait de recruter avant ses concurrents.

Lénore CorbeauxCTO, Izeos

context: Web Developer @ Izeos

My skills

Development

System administration

Project management tools

Soft skills

Education

Master of Science

Supinfo — Paris, Tour Montparnasse

Advanced programming (Java, C#), project management, cloud computing, network architecture, cybersecurity.

Bachelor of Science

Supinfo — Paris, Tour Montparnasse

Web development (PHP, JavaScript), databases, virtualisation, Linux administration.

BTS Information Technology Services for Organizations (S.I.O.) Option Software Solutions and Business Applications

IRIS — Paris XVII

Software development, systems maintenance, database management, networks and telecommunications.

Professional Baccalaureate in Electronic and Digital Systems (S.E.N.) Option Telecommunications and Networks at IRIS