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Some of the most important conversations we have start with someone sharing that they're worried about their team. They have a growing concern that they rely on only one developer, on whose shoulders the entire application rests. There's a lot of pressure on a single person, and if it's not addressed, it puts the whole application at risk.
A solo dev on an application is kind of irreplaceable. They know what the system does and why certain things work the way they do (for example, a three-year-old workaround that was never documented). They can even look at an error and know (from instinct) where the problem is coming from and why. They might even be the sole reason the system still works.
But that knowledge becomes a burden over time. Every question comes to them. Every deployment depends on them. Taking a real vacation means something might break, and nobody else will know how to fix it.
The system they built and learned so well has become, in some ways, a trap. But there are ways to ease some of that pressure, which we'll talk about later.
When knowledge only lives in one place
When a system's institutional knowledge lives entirely in one person, liability quietly builds.
They can't step back to think strategically. They can't hand off a task without a 30-minute explanation first. They can't be unavailable without it becoming an incident. And organizations begin to sense this fragility without naming it, creating a quiet pressure that falls on the person who least deserves it.
This is what we call knowledge debt. It's less visible than technical debt, but it compounds just as fast. And unlike technical debt, it doesn't show up in a code review.
These days, AI-assisted coding tools are adding a new layer to this problem. When the rest of the team reaches for an agent to help them move faster, there's often only one person who can tell whether the output is actually safe- the developer who knows the system. That judgment can't live in the AI tool because of the ambiguity of the choices it makes. You can build judgment gates into the tools, but they won't understand the little nooks and crannies of how something may have failed to work before or why something is there. And when all of this only lives in one person, you're one unavailable developer away from agentic coding going off the rails.
Then comes the "rewrite impulse"
When companies finally name this problem, the conversation often drifts toward rewrites.
But a rewrite doesn't transfer knowledge- it abandons it. The new system might be cleaner, but it won't carry the years of decisions baked into the existing one. The edge cases. The hard-won fixes. The things that look strange until someone explains why they're actually exactly right.
The system that's been running in production for years, handling real users and real edge cases, isn't a liability. It's proof. Proof that someone did something right, and kept doing it right, under pressure, for a long time.
All of that work has a legacy worth honoring.
What it actually needs is a second team
But not a replacement team that shows up with a migration plan and a modernization roadmap.
It needs a second team whose first job is to learn… from the system, yes, but more importantly from the person who knows it best.
This means working alongside that developer. Asking the questions they've never been asked to answer out loud. Writing down the things they've always just known. Slowly, carefully picking up pieces of the load so that they can let go of a few things without everything falling apart.
The second team also brings with them knowledge from their other clients, context from projects that may have similar tools, and experience solving the same problems.
This provides a backup to what the solo person has experienced, reinforcing their good efforts and decisions. It also adds additional context to help de-risk the proposed options to a fix, new feature, or long-standing issue.
The goals in this scenario are to compound knowledge without judgment, make knowledge portable, make a solo dev’s presence less load-bearing, and ensure their expertise is something the whole organization can benefit from, rather than a burden one person has to silently carry alone.
Bringing in backup and what it looks like
A second team works in the system rather than speculating about it from the outside. Deployments become shared experiences, so the knowledge lives in more than one set of hands. Honest conversations surface where the real risks are, and small contributions build trust.
Over time, the primary developer starts to have choices they didn't have before. They can take a week off. They can work on something new. They can share the cognitive load that's been entirely theirs for years with another team or person who actually understands the system well enough to carry it.
We're often brought in as this second team to work alongside a sole developer, and we know it can feel a bit scary. Empathy and good diplomatic skills come in handy.
And that's what a second act is all about
We believe that proven software deserves a second act- not a rewrite, not a replacement, but a continuation. A chance to evolve, to improve, to become more than it was without losing what made it work.
The same is true for the people holding those systems together.
Your best developer built something that lasted. They kept it running when nobody else could. They deserve a team that comes in not to take over, but to back them up, to learn what they know, share what they carry, and make sure the system they built has the support it deserves to keep going.