01
Rugby & lifting
Teamwork on one side, a clean disconnect on the other.
10+
years of experience
Open to missions
Hey there, I'm
Baptiste VASSEUR
Freelance developer · Instructor · Architecture · AI
On-site: Paris / Île-de-France·Remote: worldwide
Freelance Developer
Freelance and Full Stack Lead Squad. I help startups and companies with architecture, AI and product — and I also take on teaching (schools, companies, teams), from idea to production.
About me
Freelance • Full Stack Lead Squad • Architecture • AI • Tech Instructor
Full Stack Lead Squad at Calmedica, I am also growing my freelance practice: dev, architecture, AI — and teaching / lecturing. 10+ years shipping maintainable systems, from backend to frontend to infra.
Calmedica is a healthtech startup: a solution to improve pre- and post-operative medical follow-up for healthcare facilities.
Instructor & lecturer
I already teach Bachelor and Master students at ESGI and .decode: development, architecture, AI, databases, Docker, testing, automation. I keep taking teaching missions — schools, training organizations, or in-house workshops. I studied at ESGI and came back as an instructor and for admission interviews: teaching is part of the job, not a side note.
The dev + instructor mix keeps me current — and you feel it in class and on projects: concrete, from the field, no disconnected slides.
I also take on technical hiring: 650+ interviews to assess developer profiles, for companies or schools.
I am a partner at .decode, a school we are building with around fifty teachers: ethical, 100% transparent, revenue reinvested in teaching.
.decode and ESGI
ESGI trains specialized technical experts. .decode trains hybrid profiles (code, project, business, design, data). They complement each other — I teach in both, depending on what the school needs.
Freelance — open to missions
I take on both product and teaching missions. Web apps, APIs, architecture, AI, mobile — and lectures or workshops for schools or companies. Brochure sites, e-commerce, internal tools: from idea to production.
JewelryFashionTechCBDBeautyTravelSportsSocial networkMobile appAviationTeaching
What I can do for you
Projects already shipped
No client logos here — just the kinds of missions I have already run, across very different worlds.
Jewelry
E-commerce & checkout
Store and purchase flow for a jewelry house, built around the catalog and conversion.
Fashion
Online boutique
Fashion e-commerce: product pages, customer journey, and a back-office that holds up.
Beauty & CBD
Brands and internal tools
Sites and tools for beauty, CBD and tech brands — brochure, catalog, internal process.
Travel & sports
Digital experiences
Projects around travel and sports: content, booking, community.
Social & mobile
Social network and app
A social network and mobile / PWA apps, from architecture to testing.
Teaching
Bachelor & Master courses
Lectures at ESGI, EEMI and .decode: architecture, AI, development, projects and hackathons.
How a project unfolds
A simple path, with as many back-and-forths as needed. Nothing is locked until you are happy with it.
- 1
We talk
No commitmentVideo call or in person: we unpack the need, the problems, the constraints, and we exchange first ideas.
- 2
Proposal & quote
First estimateI come back with a clear reading of the topic, concrete directions, and a first quote. We adjust together before kicking off.
- 3
Mockups & framing
Before codingGraphic identity, mockups, and a discussion of the key features. We validate the direction before writing a line of code.
- 4
First version & testing
We iterateI ship a V1, we put it in testing, you give feedback. We go around again as much as needed until it feels right.
- 5
Go live
3 months includedFinal delivery, production, performance follow-up, touch-ups and changes. Then 3 months of maintenance included.
- 6
Ongoing care
Monthly or yearlyAfterwards, a retainer for updates, evolutions and performance monitoring — and I stay in the loop.
And for a lecture?
Shorter than a product build. We frame the teaching need, then we go.
1
The brief
Audience, level, duration, format (lecture, workshop, mentoring) and syllabus constraints.
2
The outline
I send a session plan, materials and exercises. We adjust together.
3
The session
I teach, I stay available for questions, and we do a quick debrief if you want.
The 3 months after go-live are already included. The retainer after that is only if you want me to stay long-term — not a requirement. For teaching, we frame the syllabus, the level and the format (lectures, workshop, mentoring).
0+
Years of experience
0+
Students taught
0+
Projects delivered
0+
Interviews conducted
Professional Experience
Over 10 years in development, software architecture, AI and team leadership
Fullstack Lead Squad
CurrentAs the technical lead of a 6-person team, I drive application architecture, code quality and technical decisions. I introduced agile practices (Poker Planning, Sprint Review, Daily, Retrospective) and help new developers settle into the team with training on our tools, best practices and ways of working. I make sure the services we build stay robust, scalable and maintainable.
Bachelor & Master Lecturer
CurrentI teach Bachelor & Master students (years 1 to 4) the fundamentals of development and modern tools: architecture, environment setup, debugging, Git, Docker, automation (No Code / Low Code) and application design. I also mentor semester projects so these skills are applied to real cases.
Bachelor & Master Lecturer
I teach Bachelor and Master students application architecture, databases, automation and AI integration in web projects, as well as the modern stacks used day to day.
Bachelor & Master Lecturer
CurrentI teach first-year, Bachelor and Master students the fundamentals of development, software architecture, data modeling (SQL/NoSQL) and AI integration in web projects.
Symfony Web Developer
I built web applications with PHP 5/7/8 and Symfony 3/4/5/6, using MySQL, PostgreSQL, Elasticsearch, Kibana, VueJS, NuxtJS, Docker, Gitlab CI, PHPStan, MongoDB, RabbitMQ and GraphQL, while following code quality standards (PSR, SOLID, DRY, KISS, FIRST) and modern architectures (DDD, Clean Architecture, Event Sourcing, TDD).
Freelance Web Developer
CurrentMissions for companies, startups and independents: web applications, APIs, brochure and e-commerce sites, PWAs, mobile apps, architecture and AI integration. Varied industries (jewelry, fashion, tech, CBD, beauty, travel, sports, social network, aviation…). DevOps (CI/CD, Terraform, Ansible) and **teaching** (schools, workshops).
Symfony Developer
These apprenticeship years are where I grew the most. I built a wide range of internal applications: a social network, a planning system, an Extranet 2.0, a mobile app rewrite, a recruitment system with admission tests and anti-cheat, a recruitment app, a stock management system, instant messaging, and more.
Web Developer
I worked on various CMS platforms (WordPress, Prestashop, Magento) to customize templates and improve SEO and performance. I also built custom modules for the agency's clients, always with code quality and SEO tags in mind.
IT Technician
I was in charge of IT system maintenance, level 1 and 2 user support, server management, software updates and file server administration.
IT Technician
I handled the association's IT system maintenance as well as the upkeep and updates of the website (WordPress). Beyond the technical side, I also welcomed club members and helped prepare activities and events.
Education
Information systems, software architecture and development
Information Systems Expert, Web Engineering
This program deepened my knowledge of web development and software architecture. I worked on real projects using the latest technologies such as Symfony, React, Svelte, Golang and microservice architectures. I ramped up quickly on application deployment (DevOps) with Terraform, Ansible, Docker and Kubernetes. The information systems side also gave me a broader view of project management and business process optimization.
SymfonyReactSvelteGolangMicroservicesDevOpsVueJSAPI PlatformSQLPythonDockerKubernetesTerraformAnsibleGitlab CI
Project Manager, Big Data & Artificial Intelligence
An intense year that introduced me to Big Data and AI. I learned to manage complex projects involving large-scale data processing, ETL pipelines and the integration of AI models into web applications. This program was a real springboard for my career in modern web development.
Big DataAIMachine LearningHadoopSparkKafkaPythonJavaSQLC LanguageGraphQLGrafanaKibanaElasticsearchSupabaseMongoDB
BTS SIO - SLAM
I started coding in middle school (modding video games and building websites to showcase my Minecraft servers). After earning my science baccalaureate, I chose a program to become a web developer. In two years I leveled up quickly by working on dozens of projects (PHP, Symfony, JS, Java, SQL) and became autonomous in web development.
PHPSymfonyJSJavaSQL
Technical Skills
Software architecture, AI, DevOps and full stack development — always exploring new technologies
Non-exhaustive list, always learning new technologies
Core technical skills
Other skills
Backend Languages & Frameworks
PHP 7.4/8Symfony 4/6NestJSAPI PlatformNode.jsGraphQLRabbitMQGolangJavaPythonC Language
Frontend Languages & Frameworks
JavaScriptVue.jsNuxtJSReactSvelteHTML5CSS3Tailwind CSSPWA
Databases & Big Data
MySQLPostgreSQLMongoDBElasticsearchKibanaSQLNoSQLHadoopSparkKafkaSupabase
DevOps & Tools
DockerKubernetesGitlab CITerraform (AWS)AnsibleCI/CDPHPStanGrafanaUnixCloudflare tunnelNginx/Traefik/Caddy
Artificial Intelligence
LLMPrompt EngineeringRAGAI AgentsMachine LearningDeep LearningBig DataData AnalysisETLData PipelinesSupervised learningReinforcement learning
CMS & E-commerce
WordPressWooCommercePrestashopMagento
Low-Code/No-Code & Automation
Home AssistantESPHomeNode-REDZapierMake (Integromat)StrapiDirectusWebflowAirtablen8nMQTTZigbeeMatter
Methodologies & Soft Skills
Clean ArchitectureDDDSOLIDDesign PatternsAgile/ScrumLeadershipTeachingRigorTeamworkSpeedPrecisionReliabilityAdaptabilityStress management
Courses & lectures
Instructor at ESGI, EEMI and .decode — and available to lecture for you: school, training org, or team upskilling
Looking for a lecturer for a module, a workshop or project mentoring? Let's talk — I adapt to the level and the syllabus.
JavaScript
Beginner to advancedLanguage fundamentals, DOM manipulation, Fetch API, async, ES6+, best practices and modern patterns.
Symfony & API Platform
Intermediate to advancedPHP framework, MVC architecture, Doctrine ORM, REST API, GraphQL, security and development best practices.
VueJS
IntermediateFront-end development with Vue.js, components, Pinia, Vue Router, Composition API and API integration.
SQL & NoSQL
All levelsDatabase design, Supabase, MongoDB, Metabase, Grafana, complex queries and optimization.
AI Integration
IntermediateAI API integration, prompt engineering, fine-tuning, practical applications and real-world use cases.
N8N
IntermediateTask automation with N8N, workflows, triggers, actions, context variables and best practices.
C Language
Beginner to intermediateC fundamentals, pointers, memory management, data structures, algorithms and optimization.
HTML/CSS
BeginnerWeb structure, modern CSS, responsive design, animations, accessibility and best practices.
Design Patterns & DevOps
AdvancedDesign patterns, SOLID principles, software architecture, CI/CD, containerization and best practices.
Projects & Hackathons
All levelsYear-long project supervision, hackathons, tutoring, defenses and technical mentoring.
Frequently asked questions
The rest of life, away from the keyboard.
Off-screen
02
Motorcycling
Road trips, rides, and a bit of wrenching.
03
Travel
Languages, people, landscapes — it widens the view.
04
Home automation
Servers, MQTT, Zigbee: a house that talks back.
05
Aviation
The sky, flights with friends, the urge to leave.
Get in touch
I am taking freelance missions: product and teaching. App, e-commerce, API, architecture, AI — or a lecture at a school / company. Tell me the need, we will talk it through. I usually reply within 24 hours.
On-site: Paris / Île-de-France·Remote: worldwide
Or email me directly