Applications
- SaaS
- Web applications
- Mobile web applications
- E-commerce
- Customer portals
A senior freelance developer for your product team
I'm a senior full-stack TypeScript developer with 10 years of experience, and I join your product team fully remote. I build features, take part in technical decisions and prepare releases.
Jean-Baptiste Thery
Senior full-stack TypeScript & AI freelance developer
Agentic developer, within your rules
Available for fully remote freelance
- Engagement
- Project work or ongoing team support
- Indicative day rate
- €550 excl. VAT
- Contracting company
- EURL jCode, registered in Paris
- Location
- Fully remote
- Availability
- To be confirmed for your project
001
001·The service
Team support with technical responsibility
I work with product teams, agencies, IT services companies and businesses that need an experienced developer.
The engagement can cover one feature, a whole frontend or the work from requirements to deployment, and I take charge of the scope we agree.
How I contribute
- Development across the frontend, backend and deployment process
- Code reviews and technical decisions discussed with your team
- Tests and checks suited to the application and its risks
- Documentation for setup, maintenance and handover
Projects I can contribute to
Websites
- Institutional websites
- Business websites
- Landing pages
- Internal portals
- Content websites
Technical foundations
- Backends and databases
- REST API
- GraphQL
- Administration tools and CMS
- Design systems
- Dashboards and data visualisation
- Real-time features
Existing products
- Redesigns and migrations
- Web performance
- Payments and subscriptions
- Authentication and SSO
- Application maintenance
002
002·How it works
From your first message to the handover
The same four steps on every engagement, so you know what happens next and what you receive.
You describe your project
Send a short brief on Malt or LinkedIn: your project, budget and target date. I confirm availability and the next step.
We agree the scope
Scope, schedule, pricing (fixed price or day rate), working hours and how we communicate, agreed in writing before work starts.
You follow the work
Code reviews, demos or written reports keep progress visible. Every change I deliver is reviewed and tested.
Handover and follow-up
Documentation, recommendations and, for development work, code whose rights the contract assigns to you. Maintenance by agreement.
003
003·Projects
Teams I joined
How I worked inside a public institution, a startup and a large company, and what I delivered.
Sciences Po · Confidential project
Full-stack foundation of an academic portal
The Spring Boot and Next.js foundation every later feature builds on, designed and built with another developer alongside the school's product, UX and IT teams.
Institutional design system for React and Angular
One component library serves the school's React and Angular applications alike. I was its main developer, working with the UX designers on every component.
B2B prospecting platform, web and mobile
A frontend that kept pace with every product iteration for 21 months, built in direct contact with the CTO and the product team.
National website and dealer-site platform
Every dealer site managed from one back office, and a national website connected to Suzuki's internal APIs. A year inside the delivery team, with full frontend autonomy.
004
004·Recommendations
What clients and colleagues say
“Excellent niveau, s'acclimate vite avec son nouvel environnement de travail (compréhension de la stack, des outils de communication, de l'industrie), très autonome et même pro-actif sur la prise de décision. Excellente communication du travail en cours et restant. Se rend facilement disponible. Je recommande pour tout dev d'application web complexe et équipe haut niveau.”
Malt“Je travaille avec Jean-Baptiste depuis quelques semaines et c'est un réel plaisir. Il s'investit fortement, fournit un travail de qualité, et ce, malgré une situation d'urgence sur le projet. Très bonne communication et à l'écoute. Je ne peux que recommander Jean-Baptiste pour vos projets et travaillerai de nouveau avec lui dès que je le pourrai !”Malt“Nous avons collaboré sur le projet Suzuki France avec Jean-Baptiste, et ce fut une très bonne expérience. Toujours pertinent dans ses réflexions et à l'écoute, il sait mener les projets avec sérieux et rigueur. Il m'a aussi été d'une grande aide lors de la réalisation grâce à ses connaissances du projet mais aussi ses compétences techniques avancées. Je recommande chaudement JB, et lui souhaite une pleine réussite en tant que freelance.”
LinkedIn005
005·Technologies
Tools chosen to suit each project
Frontend
Backend
Data and content
Deployment
AI integration
- LLM integration
- MCP servers
- Local document retrieval
- On-device embeddings
Quality
- Accessibility
- Vitest
- Cypress
- Core Web Vitals
- Monitoring
- Design tokens
006
006·About
Working inside your team
From the first week, I adopt the way your team works: a habit formed with Suzuki France and Decathlon before AI coding tools, which coding agents, used within your company's rules, have not changed.
Through jCode, I work with public institutions, established companies and startups. My own products, WorkoutGen and Ragmir, taught me what follows a release.
- of web development
- 10 years
- missions completed on Malt (November 2026)
- 80+
- as a freelancer
- 7 years
- from 47 client ratings on Malt (November 2026)
- 5.0/5
Areas of expertise
007
007·Related services
Choose the support you need
Prototype to productBuild a web applicationExisting applicationAudit and improve your applicationClient projectsExplore selected work
Compare the available services on the services overview.
008
008·FAQ
Working together
What is your day rate?
€550 excluding VAT per day, indicative as of October 2026. The proposal for your engagement then depends on its scope, length and responsibilities.
Do you work on site?
No. All my freelance work is fully remote, as were my engagements for Sciences Po, Leadbay and Suzuki France. Meeting times are agreed with your team, and written updates cover the rest.
Can you work through an agency or IT services company?
Yes, with EURL jCode as the contracting company. I have already worked through RECSI Group for Sciences Po, and through DPS Syneido for Decathlon France, Suzuki France and Oney.
Can you work on just the frontend or backend?
Yes. My engagements for Leadbay, Sweez and Decathlon covered the frontend only, in React, Next.js or Svelte. On the backend, I work with Node.js and TypeScript, Java / Spring Boot and Symfony.
Will you use AI tools on our code?
Yes, within your company's rules: the tools, accounts and data it allows. I use business or API accounts that keep client code out of training; the contract provides for the assignment of rights to the code I deliver, AI-assisted code included. The agentic development page has the details.
Can you work like a forward deployed engineer?
Yes for the work, no for the title: I work fully remote, embedded in your team and accountable for an agreed part of the product. The forward deployed engineering page explains the role and where my experience fits.
009
009·Contact
Let's talk about your project.
Tell me what you want to build or improve, your budget and your target date.
- Fully remote
- English or French
- France · UK · US