Freelancer profile translated to English.
Back to original languageAbout Julien
Full-Stack Developer Python / TypeScript
👋
I help companies design, optimize, and automate their applications and business tools. Versatile, curious, and meticulous, I have worked on various projects — from industry to logistics, including research and renewable energy...
I develop robust, scalable, and maintainable solutions, through a real understanding of business challenges.
I master a coherent set of technologies around web and application development, which allows me to design complete solutions, from creation to production.
Concrete examples:
- Automatic stock synchronization between several photovoltaic equipment suppliers
- Automation of a logistics process - Analysis of data provided by WMS/TMS via EDI / API
- Automatic PDF analysis + generation of structured summaries via AI/LLM (RAG)
🎯What I do for you
✨Web applications & business tools
- Development or redesign of tailor-made solutions
- Improvement or maintenance of your existing applications
- Showcase website
⚙️APIs & integrations
- Creation of REST APIs
- Integration of third-party services, ERP, CRM, internal tools
🏗️Architecture & infrastructure
- Design of scalable backends
- Docker, CI/CD, microservices
- Automated deployments (AWS, Serverless)
- Documentation
🔧Optimization & reliability
- Performance improvement
- Resolution of blocking bugs
- Automation of recurring tasks
- Technical support or team reinforcement (Agile)
🛠️Technical Stack
- Backend: Python (Flask, FastAPI), Node.js/TypeScript, PHP (Symfony)
- Frontend: React, Next.js, TailwindCSS
- Database: PostgreSQL, MongoDB, SQLAlchemy, Prisma
- DevOps: Docker, AWS, GitHub Actions, CI/CD
- Quality: TDD, Pytest, Vitest
💡My strengths
- Tested, documented, maintainable code
- Clear and responsive communication
- Constant technological monitoring
French
Native or bilingual
English
Fluent
Remote only
Primarily works remotely
Experience
- Solteo
On Malt
Full-stack DeveloperENERGY AND UTILITIESApril 2025 - September 2025 (5 months)Paris, FranceSolteo — Frontend and backend development (solar energy)
Solteo, a startup specializing in solar energy, undertook its international expansion. I participated in this development by working on the frontend, backend, and infrastructure.- Implementation of multilingual translation with Next-intl
- Creation of the internationalization component and structuring of translation JSON files
- Development of the backend for a 3D management tool
- Writing unit tests with pytest
- Complete redesign of a product library connected to supplier stocks, ensuring backward compatibility
- Creation of Docker containers to run workers (Lambda, serverless)
- Bug fixing and UI improvement
- Development of UML diagrams (sequence, use case, class, logical data model)
- Implementation of Crisp routines (internal automations)
- Abstraction of the file upload system to make it generic
- Introduction of development patterns (Repository Pattern, dependency injection, etc.)
- SpacefillTypescript Python DeveloperTECHJuly 2024 - Today (1 year and 11 months)Paris, France
SpaceFill — Recurring missions (logistics / 3PL)
Development and maintenance of WMS (Warehouse Management System) connectors allowing SpaceFill's clients to efficiently manage their warehouses.- Design and integration of WMS connectors
- Maintenance and continuous improvement of existing connectors
- Migration of WMS connectors from Python to TypeScript
- Development following TDD (Test Driven Development) principles
- IROCFull-stack DeveloperRESEARCHDecember 2023 - July 2024 (7 months)Paris, France
IROC — Backend & AI Development (scientific research)
IROC is a company specializing in scientific research, aiming to facilitate the work of researchers through AI-assisted features, such as publication summarization and literature search.- Backend optimization and implementation of Server-Sent Events (SSE)
- Setup of GitHub Actions for AWS, Docker, EC2 pipelines
- Creation of Docker containers embedding ML models on EC2 with GPUs
- Development of a notification system
- Design of an automatic scientific publication summarization system (backend & frontend)
- Optimization of a publication rating system
- Bug fixing and continuous improvement
Reviews
Recommendations
FU
+1
These freelancer profiles also match your criteria
Agatha Frydrych
Backend Java Software Engineer
4.7
(3)
2
Baptiste Duhen
Fullstack developer
4.6
(4)
5
Amed Hamou
Senior Lead Developer
4
(2)
7
Audrey Champion
Web developer
4.3
(3)
4
Education
- Web and Mobile Web DeveloperCefim2019
- Application Designer DeveloperCEFIM2020Java / Android / Python / Agile / DevOps / Docker