Rein Henrichs: The Real Work of Maintenance Happens Before You Touch the Code

In this episode of Maintainable, host Robbie interviews Rain Henricks, a principal software engineer at Procore, about the often-overlooked mental and organizational work behind sustainable software maintenance. Henricks introduces the 'line of representation' model—inspired by resilience engineering and Plato's Cave—to illustrate how software teams interact with systems through shared mental models rather than direct access to the underlying code. He emphasizes that well-maintained software isn't just about clean code, but about a shared understanding, or 'common ground,' among team members. This includes mutual predictability of actions, especially during incidents, where clear communication and structured coordination (like incident command protocols) prevent chaos. Henricks also discusses the importance of weak signals—subtle indicators of systemic issues—that teams often ignore due to time pressure, and how these signals are critical for long-term maintainability. He advocates for cultivating 'adaptive capacity' through sensemaking, epistemic delegation, and continuous learning, rather than relying solely on measurable metrics. The conversation concludes with a call to prioritize human judgment, team health, and organizational learning over rigid processes and false certainty.