Freelancer profile translated to English.
Back to original languageAbout Ronan
IIoT & JS/TS Lead Developer Expert – Industrial Modernization & Reliability
Lead IoT developer and architect with over 10 years of experience, I support industrial companies in modernizing, digitizing, and ensuring the reliability of their production lines towards Industry 4.0. My rare dual expertise – from low-level hardware design (C/C++, microcontrollers, sensors) to high-level software architecture (React, Node.js, Cloud, Edge Computing) – enables me to design and deploy complete end-to-end cyber-physical systems (CPS).
Specializing in ESP32 MQTT and STM32, I design custom electronic boards (PCBs), develop associated embedded firmwares, and manage prototyping, testing, and then production (small to large scale).
Versatile and product-oriented, I intervene end-to-end:
• Hardware & IoT: PCB design, low-level programming (FreeRTOS, Baremetal), LoRa/MQTT integration
• Software: Robust backend APIs (Node.js, NestJS) and modern interfaces (Vue.js, React)
• Industrialization & Management: production rollout, CI/CD, technical coordination
My goal: to deliver reliable, scalable, and market-ready solutions, whether for POCs, industrialization, or scale-ups.
🛠️ Preferred Stack
• Frontend: Vue.js, React – careful UX
• Backend: Node.js, NestJS – performant APIs
• IoT: STM32, ESP32, embedded Linux, LoRa, MQTT
• Quality: Jest, Cypress, CI/CD
Result: products delivered faster, more reliably, with a better user experience.
French
Native or bilingual
English
Fluent
Remote only
Primarily works remotely
Experience
- MonCasierFraisLead Hardware | Senior DevRETAIL (SMALL BUSINESS)June 2025 - Today (1 year)Valence, France
Lead Hardware & Senior Dev
• Design and industrialization of complete electronic solutions for the automated retail sector: needs definition, prototyping (boards, firmware), component selection, product validation, production transfer.• Active R&D and proactive approach: I anticipate technical evolutions, integrate new technologies, and ensure hardware-software coherence.• Senior full-stack software development in complete autonomy: frontend in React, backend in Node.js / microservices, API management, performance, security, scalability.• End-to-end management: from product idea to operational deployment, I handle hardware and software architecture, industrial processes, and deliverable quality.• Autonomy & product mindset: I favor pragmatic, reliable, and scalable solutions, aligned with business objectives and user experience. - C-981Senior DeveloperAVIATION AND AEROSPACEJanuary 2025 - June 2025 (5 months)San Francisco, CA, USA🎯 My Role at C-981As a Senior Developer, I play an active role in shaping our product by combining innovation, performance, and user satisfaction. My goal is to drive the design, development, and continuous improvement of our platform.🚀 My ResponsibilitiesFeature Definition: I collaborate with the Product and UX teams to challenge and refine new feature specifications.Fullstack Development: I design, develop, and optimize features using our tech stack (React, Node.js, TypeScript, GraphQL, MongoDB, Docker, Azure).Innovation & Tech Watch: I explore and propose the integration of new technologies, including AI, to enhance our product and internal processes.Reliability & Performance: I ensure code quality, maintainability, and scalability by following best development practices.Collaboration & Knowledge Sharing: Teamwork is key—I participate in code reviews, exchange feedback, and contribute to the team’s growth.🌍 Why This Role Excites MeWorking at C-981 means evolving in a dynamic environment where innovation and impact drive every decision. It’s also the opportunity to help turn a fast-growing startup into a major success story.Always happy to discuss tech and innovation—feel free to reach out! 🚀
- ITDM GroupBackend Lead DeveloperCIVIL ENGINEERINGNovember 2023 - February 2025 (1 year and 3 months)Colmar, FranceResponsible for the design, development, and optimization of robust, scalable, and secure backend solutions for high-stakes technical projects.🔧 Main missions:
- Design and development of performant and scalable backend systems
- Database architecture and optimization (queries, indexes, stored procedures)
- Creation, integration, and maintenance of APIs for inter-application communication
- Implementation of security protocols (authentication, authorization, intrusion prevention)
- Analysis and improvement of backend performance (profiling, refactoring, bottleneck resolution)
- Technical leadership and mentoring of junior backend developers (code review, best practices)
- Implementation of unit and integration tests to ensure code reliability
- Participation in CI/CD: creation of automated deployment pipelines
- Writing clear and comprehensive technical documentation
- Active monitoring of backend technologies, security, and DevOps practices
🌐 Technical environment:Node.js, NestJS, TypeScript, PostgreSQL / MySQL / MongoDB, REST, GraphQL, OAuth2, JWT, Docker, GitLab CI/CD, Jest, Swagger, Redis, WebSockets, NGINX, Bash, REST & SOAP APIs, monitoring and logging tools (ELK, Prometheus, etc.)📌 Key projects & results:- Deployment of resilient backend architectures in critical environments
- Significant reduction in response times for heavily used APIs
- Mentoring junior profiles towards rapid and autonomous skill development
- Contribution to technical choices and project structuring for back-end projects
- Active participation in DevOps strategy and smooth service deployment
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Education
- BTS SIOSEPR Lyon2013