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Programming
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Achievement: Public SponsorAchievement: Pull Sharkx3Achievement: QuickdrawAchievement: Pair ExtraordinaireAchievement: YOLO

Achievements

Achievement: Public SponsorAchievement: Pull Sharkx3Achievement: QuickdrawAchievement: Pair ExtraordinaireAchievement: YOLO

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justinallenmarsh/README.md

Justin Marsh

Software engineer in Berlin. I build web applications, developer tools, and software for working with music and video.

I build and operate TangoTube, a platform for discovering Argentine tango performances. My work spans Rails applications, Go command-line tools, and Rust audio processing. I care about data integrity, repeatable tests, and making systems straightforward to operate.

Selected work

TangoTube

A Rails product that organizes performances around dancers, music, and events. It brings together a searchable catalogue, music identification, and tools for dancers to explore and practice. The application source is private; the CLI below is open source.

Live product 路 Architecture overview

Mutineer Mongoid

A maintained fork of Mutineer that adds parallel mutation testing for Rails applications using Mongoid and RSpec. The integration isolates each mutant's database, preserves seed data and indexes, and distinguishes infrastructure errors from mutations caught by tests.

Implementation 路 Integration tests 路 Design notes

TangoTube CLI

A Go CLI for searching tango videos, managing a personal library, and creating practice clips. It supports interactive terminal use, structured JSON output, and an MCP interface for coding agents.

Documentation 路 Tests 路 Design notes

Website 路 Email

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