Juan聽Leo
Senior Backend Developer at Nextlane
Barcelona, Catalonia, Spain
Summary
馃懁
Senior馃帗
Top SchoolJuan Leo is a Senior Backend Developer based in Barcelona with 11 years of experience designing and implementing backend systems using C#, ASP.NET Core and Entity Framework within microservices architectures. He brings deep legacy-to-modern expertise, having maintained and evolved client/server PowerBuilder applications and integrated them with C# (WCF, COM Interop) services, Oracle and SQL Server backends. Comfortable across SOAP, XML and RESTful integrations, he also contributes value on front-end and UX assets through Photoshop, Illustrator and web technologies when needed. Currently driving backend development at Nextlane, Juan combines pragmatic database-driven design with a proven track record in Dealer Management Systems and third-party integrations. A longtime practitioner of Subversion-era workflows, he pairs that operational knowledge with modern .NET Core practices to help teams modernize without risking business continuity.
11 years of coding experience
25 years of employment as a software developer
T茅cnico especialista en Inform谩tica de Gesti贸n, Informatics, T茅cnico especialista en Inform谩tica de Gesti贸n, Informatics at Col路legi Sant Ferran
Spanish, Catalan, English
Stackoverflow
514reputation
25kreached
9answers
12questions
Github Skills (32)
font-family10
netframework9
typeface9
net9
tcp9
broker8
uwp8
nuget8
mqtt-protocol8
csharp8
option-type7
mqttnet7
iot-platform7
anycpu7
netcore7
Programming languages (4)
Github contributions (5)
jdmartinez/notion-movie-updater
Feb 2025 - Jul 2026
Notion Movie Updater
Contributions:25 PRs, 47 pushes, 29 branches in 1 year 5 months
jdmartinez/Functional
Dec 2023 - Mar 2026
Functional C# types
Contributions:8 releases, 1 review, 85 PRs in 2 years 3 months
csharpfunctional-programmingoption-typeresult-type
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