Jesper De Jong
Independent Software Developer at Jesper de Jong IT Consultancy
South Holland, Netherlands
Summary
👤
Senior🎓
Top SchoolJesper De Jong is an independent software developer and architect with 15+ years of experience designing and building high-quality, scalable server-side systems on the JVM using Java, Kotlin and Scala. He favors pragmatic, business-driven solutions and excels as a hands-on technical leader who sets architecture, mentors teams, and contributes actively to design and implementation. His background spans mission-critical projects—payments, content delivery, and real-time transport information—where security, availability and performance were paramount. A Certified Scrum Master, Pluralsight author and long-time community moderator, he combines deep technical craft with a knack for teaching and clear communication. Based in South Holland, Netherlands, Jesper is available for freelance and contract engagements that prioritize measurable business value.
15 years of coding experience
29 years of employment as a software developer
MSc Electrical Engineering, MSc Electrical Engineering at Delft University of Technology
Dutch, English, German, Danish
Stackoverflow
204,616reputation
29.8mreached
2,005answers
27questions
swing
top-5%
type-conversion
top-5%
return-value
top-1%
arraylist
top-1%
floating-point
top-5%
dictionary
top-5%
Github Skills (200)
multithreading10
hashcode10
double10
profiling10
timezone10
eclipse10
jaxb10
javascript10
rounding10
jar10
date-format10
stream10
bytecode10
lambda10
return-value10
Programming languages (9)
Github contributions (5)
jesperdj/sslclient
Feb 2015 - Apr 2021
Example of how to use SocketChannel and SSLEngine for SSL communication (client side).
Contributions:6 commits, 4 pushes in 6 years 2 months
sslsocketclient-sidecommunicationsslengine
jesperdj/reactive-demo
Aug 2018 - Jan 2024
Reactive programming examples using Project Reactor.
Contributions:11 pushes, 1 branch in 5 years 5 months
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