Freelancer profile translated to English.

Description

With 6 years of experience, I assist my clients in creating custom, robust, and high-performance software solutions in Windows, Linux, and embedded environments.

Specializing in C# (.NET), C/C++, PHP (SOAP/REST), and ESP32 firmware, I design client/server applications, optimized firmwares, and industrial communication interfaces (USB, UART, CAN/UDS).

🎯 Key Expertise:

Embedded diagnostics (automotive, industrial, IoT)

Firmware development on ESP32 (ESP-IDF), CAN bus management, CAN FD, UDS

Reverse engineering of firmwares & binary files (ECU)

Software interfaces (C#, WinForms/WPF, PHP SOAP/REST)

Secure communication: RSA/AES hybrid, SSL tunnels, SOAP servers

Creation of firmware flashing, logging, monitoring, and updating tools

Complete projects: from electronics (DipTrace PCB) to PC software

🛠️ Main Technologies: C# .NET 4.8 / Core · PHP/MySQL · Embedded C/C++

ESP32 (ESP-IDF), · CAN/UDS, USB CDC

Git · Visual Studio · VS Code · Webmin · Ubuntu Server

📍 Based in Île-de-France – 100% remote work or hybrid mode according to your needs.

Industry field of expertise

Languages

French
Native or bilingual
English
Conversational

Workplace preferences

Remote only

Primarily works remotely

D PERFORMANCE
Automotive Diagnostician – Electronics & Data Expert
AUTOMOBILE
July 2016 - November 2018 (2 years and 4 months)
Advanced electronic diagnostics on all vehicle brands (passenger and commercial)

In-depth fault analysis using OBD-II tools, CAN frame analysis, and ECU data extraction

Reverse engineering of binary files from engine and gearbox control units

Detection of patterns, flags, injection tables, or hidden parameters for repair or optimization

Contribution to the creation of internal fault and technical mapping databases
SERMA INGENIERIE
Flying Doctor – HEV / PHEV / EV Battery Expert
AUTOMOBILE
November 2018 - February 2021 (2 years and 3 months)
In-depth analysis of prototype battery packs for hybrid and electric vehicles (HEV, PHEV, EV)

Diagnosis of electronic and thermal failures on high-voltage packs (up to 400V)

On-site repairs and rapid technical interventions during development and validation phases

Reading and decoding CAN frames specific to BMS (Battery Management System) management

Advanced use of analysis tools such as CANalyzer, oscilloscopes, and high-voltage safety equipment

Collaboration with manufacturer R&D teams to improve battery system design
Mission freelance – client international
C# Software Developer – CAN / UDS Communication Specialist
SOFTWARE PUBLISHING
October 2019 - August 2023 (3 years and 10 months)
Mission as a freelance developer on automotive diagnostic software (C# + CAN/UDS protocol). Remote collaboration with an international technical partner.

Design of automotive diagnostic software in C# (.NET Framework) with a WinForms graphical interface

Development of a client/server system for communication with the ECU via UDS over CAN protocol

Creation of an integrated client database on the server for managing activations, processing, and logs

Implementation of analysis and editing modules for binary files from ECU dataflash (pattern, offsets, CRC)

Real-time communication with ESP32 firmwares (USB CDC) to control custom OBD-II interfaces

Optimization of USB performance (double buffering, bulk transfer, IOCP, burst) for smooth diagnostics

Participation in the design of embedded firmwares (ESP-IDF) and custom OBD hardware interfaces

Development of ESP32-S3 firmwares (ESP-IDF / Visual Studio Code) for OBD-II diagnostic interfaces

Implementation of a custom ASCII communication protocol over USB CDC

Bidirectional transmission of CAN FD frames via USB, with optimized buffer management (burst, timeout, double buffering)

Use of the TWAI driver for the CAN stack, with real-time UDS frame processing

Integration of an intelligent logging system: session tracking, USB/CAN performance, CRC calculations, and advanced filtering

Design of custom OBD-II electronic boards (via DipTrace) with isolated CAN transceivers

Testing and validation of firmwares with OEM diagnostic software and ECU simulation environments