John Ky - Staff Engineer at Zendesk

John Ky

Staff Engineer at Zendesk

Sydney, New South Wales, Australia

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Summary

🤩

Rockstar

🎓

Top School

John Ky is a Staff Engineer with 13 years of experience building resilient distributed systems across fintech, cybersecurity, blockchain, and large-scale SaaS. He has shipped low-latency trading infrastructure at Nasdaq, maintained Cardano node and ledger code with thousands of commits, and led account orchestration and migration platforms at Zendesk supporting hundreds of thousands of customers. Comfortable across C++, Java, Haskell, Scala, Rust and TypeScript, he picks up new languages quickly and recently used AI-augmented workflows to prototype and ship high-quality Rust developer tools and a 510 MiB/s JSON evaluator. A prolific open-source maintainer (haskell-works: 156 repos) and contributor to the GHC and Cardano projects, he combines deep systems thinking with pragmatic engineering practices like deterministic testing and STM-based concurrency. Open to high-agency founding engineer roles, he brings a track record of moving complex systems from prototype to production while introducing automation and AI-assisted developer workflows.

13 years of coding experience

21 years of employment as a software developer

Certificate of Completion, Japanese, Certificate of Completion, Japanese at Japan Foundation

UNSW Sydney

Japanese, Japanese Certificate I, II, III, Japanese, Japanese Certificate I, II, III at TAFE NSW

HSC, HSC at St Mary's Cathedral College

SC, SC at St Johns Lakemba

English, Chinese, Japanese

Stackoverflow

Stats

31reputation

312reached

1answer

2questions

Github Skills (14)

cardano10

haskell10

blockchain10

cli10

testing10

nix9

aeson9

github-ci8

githubaction-workflow8

json7

st-monad6

monad-transformers6

haskell-stack6

conduit6

Programming languages (21)

PowerShellJavaC++RustCScalaTeXGo

Github contributions (5)

IntersectMBO/cardano-node

Jul 2020 - Jan 2023

The core component that is used to participate in a Cardano decentralised blockchain.

Role in this project:

Back-end Developer

Contributions:1643 reviews, 941 commits, 1322 PRs in 2 years 7 months

Contributions summary:John's commits focused on adding and testing functionality related to genesis creation, primarily within the context of the Cardano blockchain's CLI tool. They contributed to the development of a test suite for this functionality. The user's work involved code changes in Haskell, including the addition of a new test case and modifications to existing test files.

blockchaincardano

IntersectMBO/cardano-ledger

Jul 2020 - Jan 2023

The ledger implementation and specifications of the Cardano blockchain.

Role in this project:

Back-end Developer

Contributions:27 reviews, 80 commits, 79 PRs in 2 years 6 months

Contributions summary:John primarily contributed to updating and maintaining the Cardano ledger implementation. Their work involved modifying Haskell code related to index state, nix configurations, and various ledger components, including UTxO, delegation, and transaction bodies. The contributions include adopting base16 decoding functions, adding support for new features, and fixing doctest errors. Furthermore, the user made updates related to the build and continuous integration processes, involving Github Actions.

blockchaincardanocryptocurrencyada

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