Sally Lait: Confidence Is the Real Metric
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In this episode of Maintainable, host Robbie Russell sits down with Sally Leite, a fractional technology leader with over two decades of experience, to explore the often-overlooked human and cultural dimensions of software maintainability. Sally argues that confidence, team sentiment, onboarding speed, and documentation quality are more telling indicators of a codebase's health than traditional metrics like test coverage or code complexity. She shares real-world examples from her career, including modernizing a legacy system built by a company's co-founder and navigating organizational transitions away from in-house software. A recurring theme is the importance of building trust, celebrating small wins, and aligning technical decisions with business outcomes. Sally emphasizes that change is rarely top-down and must be driven through empathy, clear communication, and inclusive decision-making, especially when addressing sensitive topics like job security or team identity. The conversation also touches on practical strategies for new engineers joining legacy systems, advocating for curiosity, humility, and early relationship-building over immediate critique.
Confidence and team sentiment are more reliable indicators of software maintainability than code metrics alone.
Small, consistent wins should be celebrated and communicated to build momentum and trust.
Technical debt and legacy systems impact hiring, retention, and business agility—these are strategic concerns.
Change initiatives succeed when they're co-created with teams, not imposed from above.
New engineers should focus on learning, asking questions, and recognizing strengths before critiquing weaknesses.
The Human Side of Maintainability
“Confidence, team sentiment, onboarding speed, and documentation quality are more telling indicators of a codebase's health than traditional metrics like test coverage or code complexity.”
Measuring What Matters: From Metrics to Morale
“Even if you make those improvements, it could still be better. It could still be faster. It could still be less buggy. An unhealthy way of looking at that, where it's pure kind of complaints.”
Influencing Change Without Authority
“What are the topics? What are the big challenges that the people you are trying to influence care about? How can you actually relate what you want to do in terms of the maintenance to the things that they particularly are scared of?”
Modernizing Legacy Systems: A Case Study
Sally recounts a major modernization project at a company where a foundational product had become a bottleneck due to siloed data and outdated integrations. The project succeeded due to clear communication, cross-functional alignment, and realistic planning.
Building Trust and Psychological Safety
For engineers without existing trust, Sally recommends building habits like mapping technical debt, sharing roadmaps, and framing improvements in business terms. She warns against surprise announcements and advocates for gradual, inclusive change.
“Don’t just point out the challenging things—highlight the things that the team’s doing really good as well.”
“Confidence, team sentiment, onboarding speed, and documentation quality are more telling indicators of a codebase's health than traditional metrics like test coverage or code complexity.”
“Never negate the good that was done. It's very easy to start kind of just saying, you know, criticising, saying all the bad things about the old system, which can really bring on that defensiveness.”
Host
Guest
Sally Leite
person
Robbie Russell
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Maintainable
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Planet Argon
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Undercover CI
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AppSignal
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Charlotte
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Lara Hogan
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Murderbot Series
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Death of the Author
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