Hernando Castano
Co-Owner at Cas Construction LLC
Orlando, Florida, United States
Summary
🤩
Rockstar🎓
Top SchoolHernando Castano is a multidisciplinary architect and builder with over 30 years of experience leading design-build and construction management across healthcare, hospitality, high-rise, and theme-park projects throughout the United States. As co-owner of CAS Constructions LLC and HR Unlimited Builders, he combines licensed architectural practice with hands-on general and roofing contracting to ensure continuity from BIM-coordinated design through construction administration. He brings rare technical fluency in BIM and large-scale project coordination—skills sharpened managing multi-million-dollar healthcare programs—and a pragmatic contractor’s eye that reduces risk and preserves design intent. In parallel, Hernando contributes to open-source blockchain tooling on GitHub, applying backend and test-automation expertise to prominent projects like Parity’s Ethereum and Polkadot stacks, reflecting a knack for rigorous systems thinking beyond the built environment. Based in Orlando, he blends entrepreneurial leadership with deep technical and regulatory knowledge to deliver complex, integrated projects on time and on budget.
11 years of coding experience
10 years of employment as a software developer
Architect, Architecture, Architect, Architecture at Universidad Nacional de ColombiaAutoCAD, AutoCAD at Valencia Community College
Github Skills (27)
json-rpc10
json10
substrate10
clientside10
testing10
parity10
polkadot-js10
ethereum10
blockchain10
smart-contracts10
webclient10
nodejs10
rust10
webassembly10
polkadot10
Programming languages (11)
Github contributions (5)
use-ink/ink
Jun 2021 - Jan 2023
Polkadot's ink! to write smart contracts.
Role in this project:
Backend Developer
Backend DeveloperContributions:4 releases, 507 reviews, 153 commits in 1 year 7 months
Contributions summary:Hernando primarily contributed to the development of the `ink!` smart contracts within the `use-ink/ink` repository, which focuses on writing smart contracts using Rust. Their work involved implementing core functionality and examples, such as the ERC-1155, ERC-721, and ERC-20 token standards. These contributions include creating new storage primitives like the `Mapping` collection and integrating them into existing examples. The user also worked on improving the bump allocator and implementing fuzz testing.
kusamasubstraterustethereumblockchain
paritytech/polkadot
Apr 2021 - Jul 2022
Polkadot Node Implementation
Role in this project:Backend Developer & QA Engineer
Backend Developer & QA EngineerContributions:29 reviews, 19 commits, 16 PRs in 1 year 2 months
Contributions summary:Hernando focused on adding and testing the weights and fees for various pallets within the Polkadot runtime. Their contributions involved creating unit tests for modules like Balance, Staking, and Democracy, ensuring correct weight estimations and fee calculations. They also refactored tests, implemented weight formulas, and updated existing tests based on changes to runtime modules. This work primarily involved verifying the performance characteristics and correctness of key Polkadot runtime functionalities.
substraterustblockchainparitypolkadot
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