Matthew Callens
Founding Engineer at Backpack
Baltimore, Maryland, United States
Summary
🤩
Rockstar🎓
Top SchoolMatthew Callens is a founding engineer and full-stack software developer with 10 years of experience building security-first cloud architectures and production systems, now focused on blockchain and crypto innovation. He has blended enterprise-grade security work at TransUnion and T. Rowe Price with hands-on blockchain engineering at Jet Protocol and open-source contributions to major Solana tooling like the Anchor framework. Comfortable across Rust, TypeScript, and backend systems, he has implemented low-level improvements (BPF mem syscall writer, Account types) that reflect deep systems and protocol understanding. Based in Baltimore, he combines startup grit from Backpack with a disciplined infrastructure background from Immutability, bringing both product-driven delivery and protocol-level craftsmanship to web3 projects.
11 years of coding experience
7 years of employment as a software developer
UMBCHigh School, High School at Mount Saint Joseph High School
English, German
Stackoverflow
6,230reputation
979kreached
258answers
45questions
javascript
top-5%
python
top-5%
Github Skills (14)
smart-contracts10
rust10
solana10
blockchain10
python9
javascript9
typescripts8
typescript8
typescript-types8
dictionary6
vue6
regex6
react6
java6
Programming languages (12)
Github contributions (5)
otter-sec/anchor
Oct 2021 - Nov 2022
⚓ Solana Program Framework
Role in this project:
Back-end Developer
Back-end DeveloperContributions:33 reviews, 36 commits, 58 PRs in 1 year 1 month
Contributions summary:Matthew contributed extensively to the Anchor framework, specifically focusing on adding features and making improvements to the underlying language and core functionalities. Their work includes implementing Box<T> for the AccountsClose trait, adding a SystemAccount<'info> account type, and incorporating a new internal writer utilizing BPF mem syscalls. These changes involved modifications to core Rust files within the lang directory and also required adjustments to TypeScript and JavaScript files.
solanarustblockchainsmart-contracts
callensm/soloha
Oct 2021 - Nov 2021
Contributions:39 commits, 14 pushes in 18 days
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