Bill Chatfield - Full Stack Java Developer at Cardinal Health

Bill Chatfield

Full Stack Java Developer at Cardinal Health

Columbus, Ohio, United States

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Summary

👤

Senior

🎓

Top School

Bill Chatfield is a seasoned Full Stack Java Developer with nearly three decades of software experience and a strong focus on Java, JEE, Angular, and diverse database systems. He has delivered production solutions across big enterprise environments—designing microservices, ETL/data-loading pipelines, and reporting systems—and recently worked on Google BigQuery and WebSphere Commerce Data Loader projects. Comfortable across the stack, he pairs backend Java and Scala skills with front-end Angular work and automated dev-ops tooling (Jenkins/Groovy, Concourse, cloud functions). His career includes leading small Agile teams, migrating repositories and CI pipelines to improve developer experience, and writing high-performance ISO C and systems automation early in his career. An active open-source contributor, he improved Apple II file-type support in the well-known cc65 C compiler, reflecting a long-standing interest in low-level systems and preservation of legacy platforms. Based in Columbus, Ohio, he blends pragmatic engineering with a talent for untangling complex data and deployment problems.

11 years of coding experience

25 years of employment as a software developer

Computer and Information Science Engineering, Computer and Information Science Engineering at The Ohio State University

English, French, English

Stackoverflow

Stats

142reputation

290kreached

4answers

2questions

Github Skills (16)

c1710

c1110

compiler-development10

header-files9

assembly8

65028

assembler8

rhino6

text-search6

http-put6

javascript6

jar6

http-post6

project-structure6

webhooks6

Programming languages (6)

JavaShellCGroovyAssemblyPython

Github contributions (5)

cc65/cc65

Jul 2017 - Jul 2017

cc65 - a freeware C compiler for 6502 based systems

Role in this project:

Backend Developer

Contributions:11 commits, 2 PRs, 21 comments in 4 days

Contributions summary:Bill contributed significantly to the cc65 project, primarily focused on adding and refining file type definitions for the Apple II platform. Their work involved creating a new header file, apple2\_filetype.h, and defining numerous file types, including ProDOS and Apple IIgs-specific types. The user also corrected copyright information and reorganized the code by moving file type variables to the header file. These changes directly support the cc65 compiler's ability to handle Apple II file formats.

sdcc8-bitfreewarecc65retrocomputing

gungwald/prodos-more

Jan 2019 - Oct 2024

The "more" text viewer implemented in assembly language for ProDOS on Apple II

Contributions:1 release, 6 PRs, 24 pushes in 5 years 9 months

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