Jonathan Hanna
Dublin, Dublin 1, United States
Summary
👤
Senior🎓
Top SchoolJonathan Hanna is a Senior Integration Engineer with 14 years of experience specializing in ETL, data migrations, and database administration across SQL Server, Oracle, and cloud environments. He builds reliable ingestion pipelines and automations using SQL, Python, SSIS, and AWS, and has led teams to scope, optimize, and operationalize complex client data loads and reporting. Jonathan’s background spans hands-on DBA duties to senior migration work—designing nuanced data solutions, building dashboards and automation, and training engineers on best practices. An active open-source contributor, he has optimized and refactored core pieces of the widely used Json.NET library to improve performance and robustness. Based in Dublin, he pairs meticulous problem-solving with clear communication to translate messy client datasets into auditable, production-ready systems.
14 years of coding experience
7 years of employment as a software developer
Master of Business Administration - MBA, Information Technology, Master of Business Administration - MBA, Information Technology at Chatham UniversityBachelor's Degree, Information Sciences and Technology, Bachelor's Degree, Information Sciences and Technology at Penn State University
English, French
Stackoverflow
111,692reputation
13.9mreached
2,040answers
1question
oop
top-1%
dictionary
top-5%
browser
top-1%
recursion
top-5%
serialization
top-5%
task-parallel-library
top-5%
Github Skills (98)
multithreading10
linq10
http10
asp-net10
overriding10
refactoring10
resharper10
dotnet10
browser10
performance-optimization10
increment10
immutability10
oop10
json10
net10
Programming languages (3)
Github contributions (5)
JamesNK/Newtonsoft.Json
Dec 2015 - Dec 2017
Json.NET is a popular high-performance JSON framework for .NET
Role in this project:
Back-end Developer
Back-end DeveloperContributions:49 commits, 51 PRs, 158 comments in 2 years
Contributions summary:Jonathan primarily focused on optimizing and refactoring the Json.NET library. Their contributions include replacing calls to the `Value` property with `GetValueOrDefault()` for improved performance, which involved code modifications in multiple files such as `JsonSerializer.cs` and `JsonWriter.cs`. Additionally, they refactored code, consolidated repeated blocks, and corrected exceptions related to writing tokens, and handling of null values.
dotnetperformancec-sharpcsharpjson-net
JonHanna/Ariadne
Dec 2011 - Jan 2014
Contributions:194 commits in 2 years 1 month
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