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John SeylerJS
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John Seyler

@johnseyler

I modernize legacy systems and build multiplayer games with C++, Qt, Linux, and Lua.

United States
Message

At Amentum supporting the Naval Surface Warfare Center Dahlgren Division, I re-engineer legacy Java applications into modern C++/Qt while preserving full production feature parity.

I've become the primary developer for an internal C++/Qt tool, delivered 250+ story points in a seven-person Agile team, and expanded a Jira-like application through SQL integrations. I also increased test coverage by over 20% with Google Test, designed 20+ XML GUIs, and strengthened GitLab merge integrity with Linux-based CI/CD submodule verification.

I validate distributed systems end to end by recreating backend and client environments across separate Linux virtual machines.

Outside work, I'm independently building and shipping a multiplayer Roblox grand strategy game with territory control, diplomacy, production, persistent DataStore saves, and GamePass revenue. I use custom MCP tooling and LLM-assisted workflows to accelerate development, including converting real-world geospatial data into a 205-territory in-game map.

Experience

Work history, roles, and key accomplishments

Amentum logoAM
Current

Software Engineer

Aug 2023 - Present (3 years)

Re-engineered a large legacy Java application into modern C++/Qt as part of a 10-developer team, preserving full feature parity. Developed and tested multiple features, increased test coverage by over 20%, and implemented CI/CD pipeline improvements.

Education

Degrees, certifications, and relevant coursework

Baylor University logoBU

Baylor University

Bachelor of Science, Mathematics

2019 - 2023

Grade: 3.87

Activities and societies: Dean's Academic Honor List: Spring 2020 – Fall 2022; Recipient of Beth Wilson Scholarship, Roy Donald Perry Scholarship, Gene & Ruth B Royer Scholarship, Brian Family Scholarship, Hickey Math Scholarship

Bachelor of Science in Mathematics with minors in Computer Science and Spanish. Graduated with a GPA of 3.87 and a major GPA of 3.96, earning Dean's Academic Honor List recognition from Spring 2020 to Fall 2022.

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