DDD Europe 2023 - Program

Leveraging Legacy Code on Teams

Pre-conference Workshops



Chelsea Troy

Chelsea Troy
June 6-7

If everybody in engineering experiences the frustrations of dereliction in legacy code, why do we keep creating that dereliction? And how can we address it more productively on software teams? Usually the problem isn't the engineers lacking skill: it's no system for managing the tech debt and maintenance challenges of the code base. In this retreat, we'll explore a system for doing that by working on an app of our very own.

We'll begin by discussing where our maintenance load, noting the misconceptions that allow that load to KEEP accruing even as we try to get rid of it. Then, we'll talk about how to quantify, visualize, and model our maintenance load for prioritization.

We'll explore an app together, treating the app as our "legacy" code base with past decisions, a current backlog, and relevance to future product plans. We'll put together some priorities for tech debt reduction and decide how to address them. Finally, we'll make some changes and practice socializing them so the broader team loses as little context on the code base as possible.

You'll develop a more complete and nuanced understanding of software maintenance, and you’ll also walk away with new techniques and activities to apply with your software teams to help them collaborate on the challenges of maintaining large, high-impact code bases.


I'll have a repo for them to install, and whichever language I write the reop in, participants should have some familiarity with. I'll try to choose something pretty common with pretty minimal setup.

About Chelsea Troy

Chelsea writes code on projects like the Zooniverse Citizen Science Mobile App and the NASA Landsat Image Processing Pipeline. She looks for clients who are saving the planet, advancing basic scientific research, or providing resources to underserved communities. She has been known to take projects in mobile development, web development, and machine learning. She streams some programming sessions to YouTube, so you can watch her code (and narrate!) in real time. She then turns the recordings into educational materials.

Chelsea also teaches Mobile Software Development at the Master’s Program in Computer Science at the University of Chicago. She is the author of chelseatroy.com and a book called Remote Work Sucks (the title is kind of a trap). She organizes two conferences: PromptConf (Chicago area, very technical) and ORD Camp (Chicago area, not nearly as technical).

Chelsea flings barbells around for fun. She drives an electric cafe cruiser named Gigi. She's very gay.