Alex Mellnik
Senior Staff Data Engineer
Chapel Hill, North Carolina, United States
Summary
👤
Senior🎓
Top SchoolAlex Mellnik is a Senior Staff Data Engineer with 11 years of experience who combines a PhD-trained scientist’s rigor with hands-on full-stack engineering at scale. Based in Chapel Hill, he has led data foundation and cost-reduction efforts for analytics at Meta, driven platform-level improvements across App Foundations and Data Infrastructure, and built production pipelines at Google, Rigetti, and Intel. He repeatedly translates complex physical and manufacturing problems into robust data products—at Intel his work yielded over $100M in savings, and at Rigetti he unified disparate data sources to enable automated analysis. An active open-source contributor, he has improved accessibility and testing in projects ranging from VMware’s Clarity design system to Julia’s DataFrames.jl, reflecting both front-end polish and backend data QA expertise. This blend of experimental physics, production engineering, and accessibility-aware contributions makes him adept at turning messy, cross-domain data into reliable, cost-efficient systems.
11 years of coding experience
9 years of employment as a software developer
Doctor of Philosophy (Ph.D.) Physics, Doctor of Philosophy (Ph.D.) Physics at Cornell UniversityBachelor's Degree Physics, Bachelor's Degree Physics at University of North Carolina at Chapel Hill
English, German
Github Skills (22)
accessibility10
testing10
data-manipulation10
dataframes10
typescript10
web-components10
dataframe10
clarity10
typescript-types10
datagrid10
typescripts10
julia10
angular10
datatable9
ui-design9
Programming languages (13)
Github contributions (5)
JuliaData/DataFrames.jl
Apr 2015 - Oct 2016
In-memory tabular data in Julia
Role in this project:
Back-end Developer & QA Engineer / Test Automation Engineer
Back-end Developer & QA Engineer / Test Automation EngineerContributions:13 commits, 8 PRs, 39 comments in 1 year 6 months
Contributions summary:Alex primarily focused on enhancing the `dataframes.jl` library's functionality and improving its testing framework. They added features to the `writetable` and `printtable` functions, including the `nastring` argument for handling missing data representation. Additionally, the user wrote tests to validate the behavior of `writetable` and `unstack` with NA values, and also modified the LaTeX and HTML output. These changes improved the library's usability, and ensured data handling and display accuracy.
memorydataframesdatatabular-datadata-frame
vmware-archive/clarity
Oct 2017 - Oct 2020
Clarity is a scalable, accessible, customizable, open source design system built with web components. Works with any JavaScript framework, built for enterprises, and designed to be inclusive.
Role in this project:Front-end Developer
Front-end DeveloperContributions:3 reviews, 15 commits, 25 PRs in 3 years
Contributions summary:Alex primarily contributed to the Clarity design system by implementing and refining Angular components. Their work included adding numeric filter functionality to the datagrid, improving the aria-label for the string filter, and enhancing the column chooser dialog. They also made documentation improvements and adjusted the DOM order in the signpost component to improve accessibility.
accessible-designweb-componentsweb-components-libraryaccessibilityui-components
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