James Seppi - Staff Software Engineer (Tech Lead) at Umbra

James Seppi

Staff Software Engineer (Tech Lead) at Umbra

Austin, Texas, United States

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Summary

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Rockstar

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Top School

James Seppi is a Staff Software Engineer and tech lead in Austin with 15 years building production-critical systems across geospatial, mapping, and satellite domains. He codes primarily in Python and TypeScript/JavaScript and currently architects the automated ground control and command systems for a Synthetic Aperture Radar satellite constellation. James has a strong track record at Mapbox and government agencies where he led low-downtime database migrations, high-throughput APIs serving billions of daily requests, and platform improvements that reduced cost and latency while preserving strict SLAs. He contributes to notable open-source projects like mapbox-gl-js and simple-statistics, spanning both front-end UX work and backend algorithmic additions. Comfortable operating in distributed teams, he blends hands-on engineering with mentoring, stakeholder engagement, and measurable operational improvements. His background in environmental and water resources engineering informs a pragmatic, data-driven approach to building resilient spatial systems.

15 years of coding experience

11 years of employment as a software developer

MS, Environmental and Water Resources Engineering, MS, Environmental and Water Resources Engineering at The University of Texas at Austin

The University of Maryland, College Park

Spanish, Chinese, English

Github Skills (23)

map-box10

javascript10

mapbox-gl10

mathematics10

css10

statistics10

typescript10

ui-design10

math10

doc10

uid10

front-end-development10

typescript-types10

html10

maps10

Programming languages (18)

MDXJavaCSSC++CPLpgSQLGoHTML

Github contributions (5)

mapbox/mapbox-gl-js

May 2018 - Apr 2021

Interactive, thoroughly customizable maps in the browser, powered by vector tiles and WebGL

Role in this project:

Front-end Developer

Contributions:10 reviews, 10 commits, 18 PRs in 2 years 11 months

Contributions summary:James primarily worked on updating the page shell component, which likely provides the overall structure and styling for the web application. Their contributions included modifying JavaScript and CSS files related to the page shell, integrating new features, and improving the user interface. These changes suggest a focus on front-end development, with the aim of improving the application's appearance and user experience. Additionally, the user updated the mapbox-gl-geocoder plugin in multiple example files.

vector-tileswebgl3djavascriptpriority

simple-statistics/simple-statistics

Jan 2014 - Jul 2015

simple statistics for node & browser javascript

Role in this project:

Back-end Developer

Contributions:6 commits, 1 PR, 1 issue in 1 year 6 months

Contributions summary:James primarily contributed to the implementation of new statistical functions within the `simple-statistics` library. They added features such as `harmonic_mean` and `root_mean_square`, and made updates to existing documentation and tests. Their work included modifying the core JavaScript files and adding corresponding tests to ensure the accuracy and functionality of the newly implemented statistical methods. Additionally, the user corrected a spelling mistake within the code.

javascriptstatisticsregressionmath

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