Freelancer profile translated to English.

Description

Experienced developer with 20 years of expertise in embedded systems and C development, self-taught in C#, Java, and Python. Autonomous, curious, and results-oriented, specializing in the design, optimization, and maintenance of high-performance programs. Proven experience through successful completion of various projects, improving system performance and user satisfaction.

Industry field of expertise

Languages

French
Native or bilingual
English
Fluent
Spanish
Basic

Workplace preferences

Can work on-site

Cergy (up to 20km)

JoathanChatelet
Technical Projects AND FREELANCE
ENTERTAINMENT AND LEISURE
October 2023 - Today (2 years and 8 months)
Cergy-Pontoise, France
Followed training courses (.NET, HTSCoding, Simon Dieny), participated in coding games, and completed various personal projects to strengthen my development skills:
Designed REST APIs in C# (.NET 8, Visual Studio 2022):
Integrated the Gemini AI API: https://github.com/Bdussart/GeminiAPICaller
Managed a library connected to a SQL Server database: https://github.com/JonathanChatelet/Library
Developed a Java mobile application (Android Studio, Java 21.0.2) utilizing the camera, file storage, and multithreading: https://github.com/JonathanChatelet/Breaking_ball
Created a Yathzee game in Python (VS Code, Python 3.12): https://github.com/JonathanChatelet/Yathzee
Self-taught JavaScript.
Provided technical assistance for a construction company (STOER), offering IT support to improve client-facing materials (Plans, comparative tables, schedules, etc.).
Managed the printing department (AIRMES), developing software in C/51 and Assembly for thermal printers, building and managing the entire client base (Address book, phone calls, mailing, etc.).
GitHub Visual Studio C# Java Python
AIRMES
Printing Department Manager
TECH
October 2004 - Today (21 years and 8 months)
Cergy, France
Developed software in C/51 and Assembly for thermal printers, built and managed the entire client base (Address book, phone calls, mailing, etc.).

C autonomie Anglais Gestion de la relation client (CRM)
Kyosha
Senior Engineer - Project Manager
LOGISTICS AND SUPPLY CHAIN
October 2003 - October 2023 (20 years)
Argenteuil, France
(2013-2023) Head of Development and After-Sales Service Department:
Managed electronic repairs and led printer projects in C/51, from design to testing (statistics, labels, speed control with fine issuance). Delivered custom solutions and improved after-sales service, contributing to customer loyalty.
(2004-2013) National and Export Sales Representative / Software Developer:
Prospected and acquired new clients in France and internationally. Adapted software for printers to client needs. Developed internal tools (printer auditing of PLCs in Assembly, test software in Visual Basic) and completely redesigned the website in HTML, expanding the client base and optimizing internal processes.
(2003-2004) Developer:
Participated in the design of a low-cost printer, allowing the company to diversify its offerings with an economical solution.
C Gestion de projet autonomie Systèmes embarqués Anglais

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DESS SMC (Equivalent Master)
Université de Cergy-Pontoise
2004
DESS SMC (Equivalent Master)
DUT GEII (Equivalent License)
Université de Cergy-Pontoise
2001
DUT GEII (Equivalent License)

Check out Jonathan's education

Jonathan Chatelet

Full Stack Developer|Expert C, C#, Java & Python

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