Fredrik Harrysson
Self Employed at dekompile
Greater Malmö Metropolitan Area Sweden
Summary
🤩
Rockstar🎓
Top SchoolFredrik Harrysson is a pragmatic polyglot engineer and former Parity Technologies CTO with 17+ years building backend systems, developer tools, and blockchain infrastructure. He blends deep functional-programming expertise (Haskell, Clojure) with systems-level Rust work—contributing to high-profile open-source projects like parity-ethereum and rust-libp2p—while also shipping production web apps in Ruby and modern JavaScript frameworks. Comfortable toggling between architecture, hands-on implementation, and client-facing consulting, he’s launched startups, led engineering teams, and runs his own consulting practice. An avid language and compiler enthusiast, he pairs rigorous numerical and PLT thinking with practical product-sense, and outside work he’s as likely to be hiking as tinkering with p2p protocols.
17 years of coding experience
18 years of employment as a software developer
Masters, Engineering Physics, Masters, Engineering Physics at Lunds tekniska högskolaJapanese, Japanese at International Study Institute
English, Swedish, Japanese
Stackoverflow
4,171reputation
745kreached
6answers
24questions
java
top-5%
generics
top-5%
Github Skills (31)
asynchronous10
futures10
async10
peer-to-peer10
bigint10
io10
networking10
libp2p10
ethereum10
blockchain10
rust10
dladdr9
java9
virtual-machine9
evm9
Programming languages (10)
Github contributions (5)
openethereum/parity-ethereum
Sep 2017 - Mar 2018
The fast, light, and robust client for Ethereum-like networks.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:9 commits, 6 PRs, 31 pushes in 6 months
Contributions summary:Fredrik primarily contributed to the `parity-ethereum` repository by modifying core backend functionality, particularly within the `updater` and `ethcore` modules. Their commits focused on refactoring code, fixing missing imports, and addressing merge conflicts related to the integration of the `bigint` crate. The user's changes also involved modifications to EVM-related code and adjustments to Trezor hardware wallet support.
ethereumblockchainlightnoderust
libp2p/rust-libp2p
Sep 2017 - Jan 2018
The Rust Implementation of the libp2p networking stack.
Role in this project:Back-end Developer
Back-end DeveloperContributions:33 commits, 15 PRs, 15 pushes in 3 months
Contributions summary:Fredrik primarily focused on implementing the TCP transport layer for the libp2p networking stack. This involved writing code to handle socket connections, manage multi-addresses, and enable communication between dialer and listener components. Key contributions include the implementation of `Transport` trait, defining `RawConn`, `Listener`, and `Dial` types, and integrating Tokio for asynchronous I/O operations using Rust. The user also refactored the code by removing the need for an explicit `Handle` from the top level interface.
rustp2pnetworkingpeer-to-peernetwork
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