Alfred Keller
Software Engineer at Swiss Confederation
Switzerland
Summary
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RockstarAlfred Keller is a software engineer based in Switzerland with nine years of hands-on experience focused on back-end systems and performance tuning. He contributes to notable open-source projects, including the IOTA Reference Implementation, where he improved thread safety and optimized consensus-related components like PearlDiver. His work shows a practical emphasis on concurrency, test reliability, and reducing operational noise through logging and parameter adjustments. A retired engineer and inventor by GitHub bio, he brings a pragmatic, systems-oriented mindset and attention to low-level correctness. Comfortable operating in distributed-ledger contexts, he combines steady maintenance skills with targeted improvements that make complex systems more robust and efficient.
9 years of coding experience
Github Skills (9)
javas10
iota10
performance-optimization10
multithreading10
java10
concurrency10
blockchain9
testing9
api8
Programming languages (6)
Github contributions (5)
iotaledger/iri
Dec 2016 - Nov 2017
IOTA Reference Implementation
Role in this project:
Back-end Developer
Back-end DeveloperContributions:13 commits, 34 PRs, 167 pushes in 10 months
Contributions summary:Alfred primarily focused on improving the IOTA Reference Implementation, specifically addressing threading issues and performance. They modified the `PearlDiver.java` file to improve thread safety and coordination and added wait with timeout. Further contributions involved reducing logging in `StorageScratchpad.java` and modifying test parameters in `PearlDiverTest.java`. They also adjusted the milestone start index and fixed the minimum weight magnitude.
iotareference-implementation
iotacommunity/testnet-orchestra
Mar 2017 - May 2017
Contributions:35 commits, 35 pushes, 2 branches in 1 month
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