Freelancer profile translated to English.

Description

Hello,

I design, develop, and optimize web applications, APIs, data pipelines, and AI solutions for startups, SMEs, and tech teams.

Thanks to a comprehensive background (fullstack, data, AI, cloud, network/security), I can work on the entire technical stack and take charge of small to medium-sized projects from A to Z.

💡 What I do

Backend Python development: FastAPI, Django, DRF
Frontend development: React, Next.js, MUI
Creation of reliable, fast, and documented APIs
Implementation of AI solutions (RAG)
Automation, scraping, scripts, and data pipelines
Infrastructure & DevOps: Docker, AWS, GCP, CI/CD GitHub Actions
Monitoring: Sentry, Papertrail
Optimization, refactoring, deployment
Technical architecture & CTO support

🎯 Added Value

360° Profile: web, data, AI, DevOps
Ability to take charge of a complete project
Readable, documented, maintainable code
High autonomy and clear communication
**CII / CIR Approved**: recovery of up to 20% of my invoices as tax credit
Educational approach (data science teacher)
Advanced mastery of AI tools to produce better and 2X faster

🔧 Key Skills

Backend

Python, FastAPI, Django, DRF, Flask, Pydantic, SQLAlchemy
Node.js, Next.js server-side

Frontend

React, Next.js, MUI
UI/UX: Figma

Data / AI

Pandas, Scikit-learn, Matplotlib
Scraping: Selenium, Beautiful Soup, Requests
Generative AI: LLM, LangChain, RAG, vector DB
Automation, pipelines

Databases

PostgreSQL, NoSQL, MongoDB

DevOps / Cloud

Docker, GitHub Actions, AWS, GCP, Heroku
Linux (Debian), monitoring, security

🎓 Background

IMT Atlantique Engineer (Télécom Bretagne)
Mathematics Agrégation
Former Network Administrator / Cybersecurity
Web 2.0 Entrepreneur
Data Science Teacher in an engineering school
Fullstack Python & JS Developer

Industry field of expertise

Languages

French
Native or bilingual
English
Fluent
Spanish
Conversational

Workplace preferences

Can work on-site

Paris (up to 50km)

Deepika
DevOps for a Chatbot in a Complex Environment
ENERGY AND UTILITIES
December 2025 - March 2026 (3 months)
Paris, France
Development and refactoring of an internal chatbot with high confidentiality constraints.
Refactoring in a complex production environment: 8 Docker services with multiple execution configurations.
Implementation of an asynchronous orchestrator with Dramatiq + Redis for mass document ingestion.
Integration into a Gitlab CI/CD pipeline.

Result: refactoring without interruption of production and development. System capable of processing large volumes of documents.

Stack:VueJS, FastAPI, Pydantic, Hydra, Dramatiq, Redis, Docker, Grafana.
Docker FastAPI DevOps Python Gitlab CI/CD
Audioliz
Tech Lead & Fullstack Architect
SOFTWARE PUBLISHING
December 2023 - Today (2 years and 6 months)
Paris, France
Design and development of an AI-powered phone call analysis SaaS solution.
Complete platform architecture (frontend, backend, data, infra).
UI/UX interfaces on Figma and development in Next.js + MUI.
FastAPI + SQLAlchemy + Pydantic backend, PostgreSQL database.
Integration of major AI providers (LLM + transcription).
Heroku deployment (containers), CI/CD GitHub Actions.
Advanced monitoring: Sentry, Papertrail.

Result: robust and documented platform, in production and used daily by the team and its clients.

Stack:Next.js, React, MUI, FastAPI, Pydantic, SQLAlchemy, PostgreSQL, Docker, Heroku, Sentry.
Next.js Material UI React FastAPI Pydantic
Nobudget
Fullstack Developer (AI Finance MVP)
SOFTWARE PUBLISHING
October 2023 - November 2023
Paris, France
Development of an intelligent personal finance management solution.

MVP design in 2 months: React/MUI frontend, DRF backend.
Automatic expense categorization API.
Bank data integration + advanced visualizations.

Result: operational Proof of Concept

Stack:React, Material UI, Django Rest Framework, PostgreSQL.
React.js Material UI Django Rest Framework PostgreSQL Next.js

Check out Julien's experience

Pierre-Antoine

Epopey

Reviewed on 11/14/2025

Thanks to Julien for this new project! Once again, he proved to be ultra-responsive, clear in his explanations, and precise in his work. The delivery is clean, professional, and perfectly meets expectations. The team is truly delighted with the result – as always with him – and can only recommend him without hesitation. Looking forward to collaborating again on a future project! 🚀

Pierre-Antoine

Epopey

Reviewed on 5/16/2023

I wish to share my complete satisfaction with Julien's performance in creating a Python script for us. His work was simply remarkable. Julien understood our needs from the start and developed the script with unparalleled expertise and precision. His Python skill level is impressive, and he used best programming practices to produce impeccable code. What was also greatly appreciated was Julien's flexibility. He was highly responsive in adapting to our requests and found creative solutions to the challenges encountered along the way. In summary, Julien's service was simply exceptional. I highly recommend him to anyone looking for a Python expert for their projects.

Louis Le Tarnec and 2 other people have recommended Julien

Agatha Frydrych

Backend Java Software Engineer

4.7

(3)

Baptiste Duhen

Fullstack developer

4.6

(4)

Amed Hamou

Senior Lead Developer

(2)

Audrey Champion

Web developer

4.3

(3)

Signup to reveal

Computer Science Engineer
IMT Atlantique
2001

Cisco Certified Network Professional
Cisco
2004
Network Administration
Applied Data Science with Python
Coursera
2020
https://www.coursera.org/account/accomplishments/specialization/certificate/EUD7E3KXDKMQ
Data Visualization Pandas Data Science Data Engineer Scikit-learn Python

Julien's certifications are only visible to Malt Community members

Julien C.

Fullstack Developer Python / Django / React

About Julien

💡 What I do

🎯 Added Value

🔧 Key Skills

🎓 Background

Experience

Reviews

5.0

Quality

5.0

Deadline

5.0

Communication

5.0

Pierre-Antoine

Pierre-Antoine

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