About Julien
As an IoT Software Architect with over 20 years of experience, I specialize in end-to-end IoT solutions encompassing cloud, embedded software, and security.
I bring to my customers a holistic approach to IoT platform design, development, and testing, with expertise in:
- IoT Security and Protocols: Focus on secure, optimized communication with CoAP, LWM2M, and MQTT over wireless communication.
I'm a LWM2M/CoAP pioneer, I founded the Eclipse Leshan project and am a committer in various open-source projects (Eclipse Californium, Apache MINA, ..)
Client Engagement: add LWM2M capabilities to an existing IoT platform, reduce DTLS handshake overhead in a multi-server environment
- Backend Scalability: Build and manage platforms supporting millions of devices using Java, Kotlin, and Go
Client Engagement: modernize and optimize Java backend applications: from 10 devices connected per machine to 200k
- Cloud Infrastructure: Proficient in AWS and Azure, ensuring robust and scalable solutions.
Client Engagement: introduce infrastructure as code in existing projects (AWS CDK, K8s Helm)
* Embedded Software: Deep experience in Linux, RTOS (Zephyr, FreeRTOS), and bare metal for seamless IoT connectivity.
Client Engagement: integrate LWM2M/MQTT clients in microcontroller-based products
French
Native or bilingual
English
Native or bilingual
Spanish
Conversational
Can work on-site
Toulouse (up to 50km)
Experience
- Clunky MachinesIoT Architect and DeveloperAugust 2022 - Today (3 years and 10 months)Toulouse, FranceAdvising startups and industrial groups on IoT architecture and platform design.• Designed scalable device-to-cloud architectures for LTE-M/NB-IoT/Thread deployments• Implemented secure boot and end-to-end key management and OTA pipelines• Supported platform scalability, cost optimization, and security hardening• Modernized, optimized cloud and embedded software (Java, Kotlin, Go, Typescript, C, Rust)
- EdgeIQArchitectAugust 2022 - September 2023 (1 year and 1 month)Boston, United StatesDirect engagement with a DeviceOps SaaS provider extending lifecycle management workflows (onboarding,monitoring, OTA, configuration) toward constrained and low-power device fleets.Scope of Work• Integrated LwM2M into an AWS/Kubernetes/Kafka-based multi-tenant platform• Designed scalable DTLS + Pre-Shared-Key distribution mechanisms for constrained devices• Hardened MQTT infrastructure (VerneMQ, AWS IoT, PKI lifecycle management)• Eliminated reliance on internal protocol patches by working upstream with open-source maintainers• Delivered Zephyr-based client reference implementations• Supported pre-sales enablement with technical documentation and integration materialImpact• Enabled standards-based support for LTE-M / NB-IoT low-power devices• Strengthened fleet credential lifecycle and secure onboarding processes• Increased architectural maturity for LPWA and constrained IoT segment
- Sierra WirelessSr. Director of Architecture, IoT SolutionsJanuary 2021 - August 2022 (1 year and 7 months)Led global IoT platform architecture across AWS, Azure, and embedded domains.• Oversaw architectural strategy for a global IoT device management platform• Coordinated cloud, connectivity, and embedded architecture teams• Defined long-term platform scalability and security roadm
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Education
- MSc, Computer Science, Software DevelopmentConservatoire National des Arts et Métiers2005MSc, Computer Science, Software Development
- Computer ScienceUniversité Paul Sabatier Toulouse III1999Computer Science