Calvin Loncaric
Principal Software Engineer at Oracle
Seattle, Washington, United States
Summary
🤩
Rockstar🎓
Top SchoolCalvin Loncaric is a Principal Software Engineer in Seattle with 16 years of experience building reliable distributed systems, formal verification tools, and program synthesis engines. He holds a PhD in Computer Science from the University of Washington where his dissertation focused on automatic program synthesis, and he brings that research rigor to production-grade software at Oracle. Calvin is an active contributor to the prominent TLA+ model checker (TLC), improving correctness and scalability by fixing subtle edge-case bugs and adding CPU-aware worker-thread detection. His background spans startups and national labs, giving him hands-on expertise in search, APIs, QA, and large-scale data visualization. Known for blending formal methods with pragmatic engineering, he excels at turning specifications into auditable, robust implementations.
16 years of coding experience
1 year of employment as a software developer
Doctor of Philosophy (PhD), Computer Science, Doctor of Philosophy (PhD), Computer Science at University of WashingtonBachelor's degree, Computer Science, Bachelor's degree, Computer Science at Harvey Mudd College
English
Stackoverflow
2,882reputation
204kreached
17answers
17questions
css-float
top-1%
html
top-5%
word-wrap
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Github Skills (21)
spec10
debug10
testing10
model-checking10
java10
javas10
specification10
css-float10
algorithms9
word-wrap9
html9
high-performance8
iterator6
sorting6
concurrent-collections6
Programming languages (17)
Github contributions (5)
tlaplus/tlaplus
Jan 2020 - Jan 2023
TLC is a model checker for specifications written in TLA+. The TLA+Toolbox is an IDE for TLA+.
Role in this project:
Back-end Developer & QA Engineer
Back-end Developer & QA EngineerContributions:158 reviews, 15 commits, 91 PRs in 3 years
Contributions summary:Calvin primarily contributed to improving the reliability and correctness of the TLC model checker, which is written in Java. They fixed bugs related to integer and interval comparisons, including edge cases, and added new tests to verify the fixes. Furthermore, the user implemented the functionality to automatically detect the number of worker threads based on available CPU cores. They also fixed minor issues like typo in error messages.
model-checkingmodel-checkermit-licensemodel-statechecker
Calvin-L/MarchingTetrahedrons
Apr 2012 - Jan 2022
A tiny, simple implementation of the marching tetrahedrons algorithm.
Contributions:2 reviews, 30 commits, 1 PR in 9 years 10 months
graphicsmarching-tetrahedron-algorithmopengl
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