Léon Hollender
Senior Backend Engineer at Qonto
Barcelona, Catalonia, Spain
Summary
🤩
Rockstar🎓
Top SchoolLéon Hollender is a backend-focused software engineer with seven years of experience building resilient server-side systems across startups and scaleups, currently working at Qonto and recently at re:cap after a senior backend role at UserTesting. He brings a disciplined, design-oriented mindset from an earlier career as a trained architect, which informs his pragmatic approach to system architecture and problem solving. An avid learner who picks up new technologies quickly, Léon thrives on challenging projects that require both technical depth and clear structural thinking. Based in Barcelona, he blends analytical foundations from preparatory maths/physics studies with real-world engineering delivery, making him strong at turning complex requirements into maintainable backend solutions.
8 years of coding experience
9 years of employment as a software developer
Master of Architecture (M.Arch.), Architecture and Urbanism, Master of Architecture (M.Arch.), Architecture and Urbanism at INSA Strasbourg
French, English, German, Spanish
Github Skills (51)
markdown10
vscode10
google-analytics9
monitoring9
lunrjs9
prometheus8
static-site8
statistics8
bloom-filter8
go-modules8
kubernetes7
golang7
web-analytics7
analytics7
proxy-server7
Programming languages (7)
Github contributions (5)
leonhfr/blog
Nov 2020 - May 2026
Contributions:78 pushes, 4 branches in 5 years 6 months
leonhfr/orca
Mar 2023 - Feb 2026
Contributions:40 pushes, 3 branches, 3 tags in 2 years 11 months
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