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Julien started his career in 1999 in the Mobile Phone Division of Alcatel as Hardware Engineer, before moving to ST Microelectronics, initially as Hardware Support Engineer and then for 8 years in the Secure Element Division, working mainly for Gemalto.

Julien joined Ledger in September 2015 as Director of Hardware Engineering, was nominated VP Hardware in July 2017 and then COO in July 2018.