Joel Klabo
Pricipal Software Engineer at Microsoft
Petaluma, California, United States
Summary
🤩
Rockstar🎓
Top SchoolJoel Klabo is a Principal Software Engineer with 15 years of experience, currently at Microsoft and previously a long-tenured iOS lead at Yammer. He specializes in iOS development and backend integrations with a strong interest in Bitcoin and the Lightning Network, contributing to notable open-source projects like the Damus iOS Nostr client and LNbits. Joel brings practical cross-stack chops—shipping polished UI/UX features on mobile while implementing currency-aware backend logic and precise Satoshi handling. His contributions to CoreBitcoin demonstrate attention to cryptographic tooling, code quality, and test coverage. Based in Petaluma, he pairs a chemistry-informed analytical mindset with software craftsmanship, tracing back to early research work on biodegradable polymers. Colleagues rely on him for pragmatic solutions that bridge product-facing interfaces and robust payments infrastructure.
15 years of coding experience
18 years of employment as a software developer
Chemistry biochemistry biodegradeable plastics, Chemistry biochemistry biodegradeable plastics at California State University, Chico
Stackoverflow
253reputation
11kreached
3answers
7questions
Github Skills (29)
objective-c10
ios10
python10
back-end-development10
lightning-network10
nostr10
bitcoin10
bitcoins10
cryptography10
swift10
data-structure9
apidoc9
ui-design9
api9
hashing-algorithm9
Programming languages (16)
Github contributions (5)
oleganza/CoreBitcoin
Dec 2015 - Dec 2015
Awesome Bitcoin toolkit for ObjC and Swift
Role in this project:
Back-end Developer
Back-end DeveloperContributions:48 commits, 1 PR, 3 comments in 1 day
Contributions summary:Joel's contributions focused on refactoring and standardizing code style within the CoreBitcoin library. They performed extensive modifications to the code, including converting bracket styles to align with Apple's guidelines for Objective-C and Swift. These changes were applied across various files, impacting core functionalities like hashing, data manipulation, base58 encoding, and key management within the Bitcoin toolkit. The user also added unit tests and refactored existing ones to ensure code quality.
objcswiftbitcoin
damus-io/damus
Dec 2022 - Jan 2023
iOS nostr client
Role in this project:iOS Mobile Developer
iOS Mobile DeveloperContributions:12 reviews, 34 commits, 87 PRs in 1 month
Contributions summary:Joel primarily contributed to the Damus iOS client, focusing on UI and feature enhancements. Their commits included implementing features like allowing users to save images to their library, making NIP-05 domains tappable, and fixing bugs related to profile picture display. They also made improvements to the user interface, such as modifying the event action bar and the addition of swipe to dismiss functionality. Furthermore, the user addressed various issues like the display of counts when too many likes and reposts are present.
nostrswiftiosbitcoinlightning-network
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