Julien Deflaux
Head Of IT Architecture Mercer Direct Investing at Marsh
London, England, United Kingdom
Summary
👤
Senior🎓
Top SchoolJulien Deflaux is a seasoned software leader with 10 years of experience building and scaling financial and enterprise platforms, currently serving as Head of Architecture at Cardano in London. He progressed from hands-on development roles (mobile, intranet, Java/J2EE stacks) to leading multi-disciplinary teams that delivered an in-house portfolio management system, client-facing digital platforms, and AI-powered covenant rating services. His background spans investment banking at Goldman Sachs to product-focused engineering in digital media, giving him a rare blend of rigorous trading-floor reliability and user-centered UI sensibility. Colleagues describe him as curious, versatile and independent—traits reflected in his track record of owning end-to-end solutions from specification to deployment and support. He has strong expertise in designing mission-critical systems, orchestration of cross-functional teams, and improving software quality through testing and automation. Outside obvious technical leadership, Julien combines an eye for UI design with an appetite for pragmatic innovation, such as building analytics and reporting tools that surfaced deeper business insights.
11 years of coding experience
12 years of employment as a software developer
2010 Computer Science, 2010 Computer Science at Institut national des Sciences appliquées de LyonBaccalaureate Scientific, Baccalaureate Scientific at Ismael Dauphin, Cavaillon
English
Github Skills (50)
python7
infrastructure6
automation6
pipeline6
apollo-server6
multiselect6
graphql-schema5
koa5
orchestration5
graphql5
angularjs5
cardano5
mypy5
data-science5
prefect5
Programming languages (5)
Github contributions (5)
jdeflaux/svelte-korean-numbers
May 2020 - May 2024
Svelte example to learn korean numbers
Contributions:41 pushes, 1 branch in 4 years
sveltekitsveltesveltejskorean
jdeflaux/exercise
Nov 2016 - Sep 2017
Contributions:2 pushes, 1 branch in 10 months
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