Jan Nielsen
Founder at Ad Hoc Markets
Salt Lake City, Utah, United States
Summary
👤
Senior🎓
Top SchoolJan Nielsen is a founder and systems architect with four decades of experience designing concurrent, high-performance applications across broadcasting, healthcare, higher education, and finance. He currently runs Ad Hoc Markets delivering low-latency trading solutions and advises startups on technical strategy, drawing on deep hands-on experience from roles at SunGard, Novell, and multiple startups. Jan is a pragmatic refactorer and backend engineer who contributes to notable low-latency open-source projects like Chronicle-Queue and Chronicle-Wire, improving maintainability and resource management at microsecond messaging scales. His background in physics and early work building detector software for the Fly's Eye observatory underscore a lifelong focus on precision systems and robust engineering.
11 years of coding experience
30 years of employment as a software developer
The University of Utah
Danish, German, Swedish, Norwegian, English
Stackoverflow
11,185reputation
1.5mreached
157answers
109questions
angular
top-5%
spring
top-5%
lombok
top-5%
java
top-5%
spring-boot
top-1%
Github Skills (30)
performance-monitor10
testing10
binary-format10
data-serialization10
resource-management10
queuing10
refactor10
java10
serialization10
javas10
performance-analysis10
spring-boot10
refactoring10
binary-data10
queue10
Programming languages (5)
Github contributions (5)
OpenHFT/Chronicle-Queue
Jan 2019 - Mar 2020
Micro second messaging that stores everything to disk
Role in this project:
Back-end Developer
Back-end DeveloperContributions:2 reviews, 28 commits, 29 PRs in 1 year 1 month
Contributions summary:Jan primarily focused on refactoring and improving the code quality of the `chronicle-queue` library. Their contributions involved optimizing existing code, such as using static builders and closing resources with try-with-resources blocks. They also removed unused code and deprecated elements, enhancing the maintainability and performance of the project. Additionally, the user addressed unchecked conversions and made adjustments to avoid deprecated methods.
storeseverythingpublisherchronicleartemis
OpenHFT/Chronicle-Wire
Feb 2019 - Jul 2020
A Low Garbage Java Serialisation Library that supports multiple formats
Role in this project:Back-end Developer
Back-end DeveloperContributions:16 commits, 15 PRs, 7 comments in 1 year 5 months
Contributions summary:Jan's contributions primarily focused on code cleanup, refactoring, and suppressing compiler warnings within the `chronicle-wire` library. They addressed warnings related to raw types, unchecked conversions, and unused code across multiple Java source files. The changes involved modifying test files, core library files, and utility classes. The commits demonstrate a focus on improving code quality and reducing potential issues.
csvdeserializationserializationgarbagemmap
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