TJ's Personal Web Site

At a glance

Name: TJ Horner
Work: Site Reliability Engineer at Twosense
Location: Redmond, WA
Projects
Blog
Résumé
Hobbies
- 📟 Hardware Design
- 💻 Embedded Development
- 🏠 Home Automation
- 🚴 Cycling
- 🗺 Mapping & Open Data
Find Me Here
- Fediverse: @tj@tech.lgbt
- Bluesky: @tjtjtj.tj
- GitHub: @tjhorner
- Telegram: @bcrypt
- OpenStreetMap: @tjhorner
- Mapillary: @tjhorner
- Somewhere else? Probably @tjhorner

Selected Projects

Here are some of my recent projects. You can learn about these and more on my GitHub profile.

May 2026

Go By Bus

Discover interesting places accessible from Seattle-area public transit routes

An RGB LED matrix display mounted in a frame hanging on a wall. It reads a list of three different public transit routes, their destinations, and the estimated arrival time for each.

January 2025

Transit Tracker

Open-source DIY public transit arrivals board

September 2024

StreetLens

Self-hosted street-level imagery importer and viewer

July 2024

GTFS Janitor

Geospatial conflation engine for maintaining OpenStreetMap with GTFS feeds

July 2024

closecall.report

Report near-misses with vehicles on a public crowd-sourced map

A photo of a small box mounted to the bottom of a desk. Two CAT5 cables are connected to it.

August 2022

Upsy Desky

Connect your standing desk to home automation

March 2022

PCB Business Card

Functional business card powered by an RP2040

Work

I am a Site Reliability Engineer at Twosense where I work on the platform and backend teams, working with everything from low-level Windows driver APIs to modern web apps.

I previously worked at MakerBot where I made projects that integrated their extensive line of 3D printers with web-based products to better serve their education and professional customers.

More complete work history is available on my résumé.