legacy01
Take over existing code without breaking it
Audit, gradual typing, tests around what already works, step-by-step refactoring: the application keeps running while it gets back on its feet.
Strict TypeScript · Tests · Step-by-step refactoring
AI/Data tech lead · LLMs in production · TypeScript
Your legacy, set straight.Your ideas, shipped to production.
I take over applications that grew too fast, without rewriting everything. And I build new ones: products, APIs, internal tools, AI in production.
// The LLM proposes, the schema disposes.
result: Order
- client: "Menuiserie Leroux SARL"
- reference: "CRT-450"
- quantity: 12
- delivery · to check: 2026-10-14
- price: not provided
after the takeover
- releases: every week, stress-free
- incidents: caught before your customers
- new features: without breaking things
- the code: documented and tested
- the team: at home in the codebase
tool: Orders
- delivered: Leroux · 12/09
- confirmed: Martin
- to chase: Dupont · 9 am tomorrow
- reminder: e-mail sent on its own
- history: who did what
go-live
- ci: tests · green
- deployment: v1.0 in production
- portal: orders · invoices
- support: AI assistant plugged in
- health: latency, errors tracked
50+sources plugged into the data/AI platform I lead
1developer across the whole chain, from collection to validated data
100,000+Android installs of the FilmoTV app
4major accounts delivered in agency: Google, Microsoft, Canal+, Club Med
01 · What I do
Set things straight. Build what’s next.
A hands-on tech lead: I design, I code, and I leave behind a codebase your team understands.
back-end02
Build a product from scratch
From idea to production: clear architecture, APIs with versioned contracts, observability and CI/CD from day one.
Node.js · NestJS · PostgreSQL · Docker
data03
Your data flows, automated
Multi-source collection (APIs, scraping, e-mails, attachments) and ETL pipelines, down to the single format your tools need.
Playwright · ETL · PostgreSQL
llm04
AI where it actually helps
Invoices, PDFs, e-mails: LLM extraction held in check by a strict schema. What’s missing is flagged, never made up.
Claude · Mistral · Strict TypeScript
tools05
Your spreadsheets replaced by a real tool
Internal tools, dashboards and reporting, with a plain React interface built around the business.
Next.js · React · TypeScript
team06
A team that levels up
Structured code reviews, shared conventions, pairing and short documentation: the quality stays after I leave.
Reviews · Conventions · Pairing
02 · A closer look at your data flows
Four steps. No field made up.
Every document goes through the same chain, from the inbox to your tools. The one I run in production.
- 01
Collect
APIs, scraping, inboxes, attachments. More than 50 sources plugged into the platform I lead.
- 02
Read
An LLM (Claude, Mistral) spots the useful fields, even in a badly written e-mail or an attachment.
- 03
Validate
Every field goes through a strict TypeScript schema. What’s missing is flagged, never made up.
- 04
Deliver
A single format, ready for your tools: APIs, databases, dashboards.
03 · Case studies
Missions, not promises.
Case 01Today
Waste traceability
The problem
More than 50 data sources, each in its own format: APIs, websites, e-mails, attachments.
What I did
As the sole developer, I designed the whole platform: automated collection, LLM reading, validation against a strict schema.
The outcome
A single format, in production since February 2026.
Case 02Agency
Internal video tools for Microsoft
The problem
Existing internal video tools, with vulnerabilities reported by Microsoft’s security audits.
What I did
Took over the existing code, fixed the reported flaws, integrated Azure Media and DRM (PlayReady, Widevine).
The outcome
Tools brought back into compliance, without starting from scratch.
Case 03Agency
FilmoTV mobile app
The problem
A film app that had to play protected videos and download them for offline viewing.
What I did
Built the video player, the DRM protection and the downloads in the mobile app.
The outcome
More than 100,000 installs on Android.
Case 04Agency
Immersive room for Google
The problem
An immersive room where several screens had to react together, in real time.
What I did
Designed and built the internal application driving the connected screens: Node.js back end, React interface, WebSocket sync, GitLab CI/CD.
The outcome
In production at Google in Paris, London and Malaga.
04 · Method
Foundations that stay easy to maintain.
- 01
Frame
Quick scoping, architecture diagram, actionable backlog.
- 02
Build
Strict typing, code reviews, tests where they matter.
- 03
Hand over
Logs, traces and metrics from the start. Short documentation, knowledge transfer.
Legacy to take over, or an idea to launch?
Thirty minutes to take stock together and leave with a clear plan.
// The LLM proposes, the schema disposes.