Caleb Spare
Software Engineer at Liftoff, Inc.
Kirkland, Washington, United States
Summary
🤩
Rockstar🎓
Top SchoolCaleb Spare is a seasoned software engineer with 15 years of experience focused on distributed systems, high-performance Go services, and developer tooling. Based in Kirkland, WA, he blends systems work—databases, caches, reliability, and performance tuning—with front-end polish from earlier roles in data visualization and UX. At Liftoff he drives operational resilience and scaling for in-house databases and caches, and his open-source contributions span core Go projects (including golang/go), high-performance hashing (xxhash), and developer tools like reflex. He favors pragmatic CS theory and best practices to boost team productivity, and has a knack for squeezing extra speed out of servers while keeping APIs and developer workflows crisp. A detail-oriented polyglot, he’s as comfortable optimizing assembly-level hot paths as refactoring UI interactions for better developer experience.
15 years of coding experience
3 years of employment as a software developer
MCS, BSCS, BA, Computer Science, Mathematics, MCS, BSCS, BA, Computer Science, Mathematics at Rice University
Stackoverflow
497reputation
21kreached
3answers
5questions
Github Skills (65)
testing10
vim-plugin10
message-queue10
refactor10
vim10
refactoring10
concurrency10
javascript10
bitwise10
regular-expression10
front-end-development10
performance-optimization10
golang10
html10
toml10
Programming languages (16)
Github contributions (5)
cespare/reflex
May 2013 - Aug 2021
Run a command when files change
Role in this project:
Backend Developer & DevOps Engineer
Backend Developer & DevOps EngineerContributions:1 release, 100 commits, 12 PRs in 8 years 4 months
Contributions summary:Caleb primarily contributed to the development of the `reflex` tool, a utility designed to run commands when files change. Their initial commits focused on implementing the core functionality of the tool, including parsing regular expressions and running commands based on file changes. Later commits involved restructuring the application by introducing new goroutines and channels for improved performance, along with adding support for more advanced features like excluding files, controlling output decoration, and managing multiple configurations.
cli
cespare/xxhash
Aug 2016 - Dec 2022
A Go implementation of the 64-bit xxHash algorithm (XXH64)
Role in this project:Back-end Developer & Performance Engineer
Back-end Developer & Performance EngineerContributions:18 reviews, 97 commits, 43 PRs in 6 years 4 months
Contributions summary:Caleb significantly contributed to the performance and optimization of the xxHash implementation in Go. They implemented a direct `Sum64` function for faster small input hashing and added assembly implementations for amd64 architecture, resulting in substantial speed improvements. Further optimizations included eliminating bounds checks and refactoring the code to ensure the use of ROLQ instructions for efficient bitwise rotations. The user also addressed minor issues and added support for string hashing.
golang64-bitxxhashgohash-functions
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