Freelancer profile translated to English.
Back to original languageAbout Yohann
🚀 Fullstack & DevOps Lead Developer — Spec-Driven Development + Generative AI · Symfony / TypeScript / Ansible
Impactful projects · Supervised AI · Global view.
I design and maintain complex IS for meaningful projects: government startups (beta.gouv.fr — Ecological Transition for Businesses with ADEME), humanitarian NGOs (CartONG / UNHCR Livelihoods), regenerative agriculture (Fermes d'Avenir), from-scratch redesigns towards modern Symfony and API Platform microservices.
🧰 Swiss Army Knife Profile
• Front: Vue/Nuxt, Angular, React/Next
• Back: Symfony, API Platform, Node, Python
• Ops: Ansible, AWX, Docker, Gitlab CI/CD, Prometheus/Grafana/Sentry
This global view allows me to make long-term decisions (architecture, debt, performance) and steer AI across all project components without changing interlocutors.
🤖 My workflow combines Spec-Driven Development and Generative AI
The spec (requirements, API contracts, model, acceptance criteria) guides the LLM (Claude Code, Copilot, Junie) as input and serves as validation criteria as output. Spec to avoid drift, senior experience to make decisions on security (OWASP, GDPR), patterns (DDD, Clean Architecture), and technical debt.
🎓 I also taught for a few years at the University of Lyon 1 (PHP/Symfony, DevOps Ansible) — not a job, just something I cared about.
✨ Impactful project + solid tech → let's talk.
English
Fluent
French
Native or bilingual
Remote only
Primarily works remotely
Experience
- Beta Gouv - DINUMLead Full-Stack Developer (Ecological Transition for Businesses)PUBLIC SECTOROctober 2023 - Today (2 years and 10 months)Lead Fullstack Developer on the government startup "Transition Écologique des Entreprises", within the Ecological Transition Accelerator (ADEME Incubator). Public platform guiding VSEs/SMEs towards ecological transition aid and programs, from project inception (late 2023) onwards.👥 Lead & Team:- Managed a team of 3 developers: code reviews, architectural decisions, and technical choices across all components (front, back, Python services)- Supported and upskilled the team- Cross-functional referent: contributions and decisions beyond code (data, design/UX, SEO, product scoping), validation and prioritization of technical tasks- Implemented a smooth deployment workflow with ephemeral review environments (review apps) per PR🚀 Product & Dev:- Questionnaire/guided journey engine directing businesses to the right programs (decision tree, response validation, personalized results pages)- Catalog of programs & projects (aid, initiatives): filters, themes, aid types, internationalization- Dynamic forms with enrichment via SIRET API (sector/NAF code mapping) and connection to the Opportunity API- Embeddable iframe widget (pre-filled SIRET, referrer/UTM tracking) for distribution on partner sites- Vue 3 / TypeScript application, then Nuxt 3 in an Nx monorepo, State design system (DSFR), Pinia store, content managed via Baserow- Technical SEO: schema.org, sitemap, metadata, robots✅ Quality & Ops:- Playwright E2E tests (anti-flakiness reliability, runtime data) and Artillery load tests- Production reliability: SWR caching strategy and proactive eviction to eliminate OOM crashes / memory leaks- Sentry observability, PostHog analytics, security version upgrades- CI/CD with review apps per PR, ESLint flat config migration, Scalingo deployment
- CartONGDevOps / Maintenance — UNHCR iRHIS (Refugee Health Information System)MEDICALDecember 2025 - Today (8 months)DevOps and maintenance intervention for CartONG on iRHIS (Integrated Refugee Health Information System), the UNHCR's refugee health information system, developed by UNICC (the United Nations' international IT center). Small team mission: setting up the testing environment and applying fixes to the application/server on an existing base (Django/DRF back, Angular/Ionic front).✅ Ops & Maintenance:
- Provisioning a testing server with Ansible (Caddy stack)
- Setting up GitLab CI/CD (testing and deployment pipelines) and optimizing Docker images (npm ci, cache, .dockerignore)
- Security hardening: secure session/CSRF cookies (HTTPOnly), pinning and updating dependencies (JWT, lodash)
- Setting up the development environment and application fixes (Django, Celery beat configuration)
- MOSTFullStack / DevOps Developer — Takeover & Evolutionary MaintenanceHEALTH AND WELLNESSSeptember 2023 - Today (2 years and 11 months)Takeover and evolutionary maintenance of MOST, a web & mobile platform for associations, clubs, and sports coaches (published by a non-profit association): member management, class scheduling and registration, communication, sports health monitoring, membership fee payments.I am not the original developer: I took over an existing system (API, administration webapp, and infrastructure), ensuring updates while recommending a redesign towards a modern stack.The mobile application is handled by another developer.🚀 Product & Dev:
- Member management: member profiles, multi-criteria search, private photos, Sports Health section (medical information and prescriptions with document upload)
- Class and event scheduling: online registration/unregistration, capacity limits (max participants), waiting lists, invitations (including non-members) with secure token flow, participation tracking (membership date verification)
- Interactive calendar (React/Vite + TypeScript component integrated into the Twig webapp)
- Announcements, membership management, email and push notifications (Firebase), XLSX export
- PHP/Slim 3 REST API (custom framework, PDO wrapper, JWT auth, Firebase and mail services), progressive migration to Doctrine ORM
- PHP/Slim 3 + Twig + Doctrine administration webapp, legacy assets (jQuery, DataTables, Grunt) and modern React components
- Spec-driven development (guided journeys, scheduling)
âś… Quality & Ops:- PHPUnit tests, reproducible development environment with Vagrant
- Automated provisioning and deployment with Ansible
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Education
- D2E Student Entrepreneur DiplomaUniversité de Lyon2016
- DUT informatique (Computer Science Diploma)Institut universitaire de Lyon (IUT A de Lyon)2007