Over the course of my career — across Comcast, Capital One, and now AWS — I’ve worked alongside a lot of people for a long time. Long enough to watch careers arc in ways that aren’t visible in any single year, to see who stayed effective and who didn’t, and to notice that the pattern doesn’t follow the obvious script.
The conventional theory is something like: the people who last are the ones who found a comfortable niche and settled in. Job security through indispensability, deep expertise in a specific domain, low enough ambition to avoid the burnout that comes from pushing too hard. The long-tenured person as someone who’s optimized for staying rather than for doing.
What I’ve actually observed is almost the opposite. The people I’ve watched remain genuinely effective over five, eight, ten years — not just employed, but good at what they do, still learning, still worth listening to — share a different set of characteristics. And most of those characteristics are internal rather than circumstantial.
What it’s not
It’s not comfort. Some of the fastest burnout I’ve watched happened to people who were technically comfortable — strong in their area, not under external pressure, not dealing with difficult management. They stopped finding the work interesting and couldn’t find a way to re-engage with it. Comfort without meaning is a slow drain, not a source of stability.
It’s not loyalty in the abstract, either. Staying somewhere for a long time is easier to explain by the people who do it than by the institution they stayed at. The same company will sustain some people for decades and exhaust others in three years. The institution isn’t the variable. The person’s relationship to the work is the variable.
What it actually is
The long-term contributors I’ve found most compelling share something that’s hard to name precisely, but I’d call it active curiosity about their own domain. Not enthusiasm — enthusiasm is weather-dependent. Curiosity is structural. It’s the thing that makes someone read the post-incident review not because they’re required to but because they genuinely want to understand what happened. It’s the thing that makes someone push back on a design decision because they’re interested in whether the assumptions are right, not just because pushing back is their style.
This curiosity, over time, compounds. People who sustain it become genuinely knowledgeable in ways that go deep rather than just wide — they’ve thought about the same problems from many angles over many years, and their thinking reflects that. They’re the people you want in a hard technical conversation not because they’re the most senior but because they’ve actually been sitting with the problem long enough to have real intuitions.
The second thing I’ve noticed is a specific kind of relationship with frustration. Every long-tenure involves accumulated frustration — systems that should have been fixed, decisions that went the wrong way, opportunities that got missed. The people who remain effective have some way of metabolizing that frustration rather than being corroded by it. They’re not naive about the organization’s failures. They’re not pretending the frustrations don’t exist. But they’ve found a way to hold the frustrations and the meaning at the same time, rather than letting one cancel out the other.
A particular person I worked closely with at Capital One had been there for seven years when I joined. She’d seen two major reorgs, a strategic pivot, several managers, and a significant technology migration. She had more context about why things were the way they were than anyone I’d met at the company — and she used that context to help people understand the present rather than to be bitter about the past. She was one of the most effective engineers I’ve worked with, and she was effective specifically because she’d been there long enough to understand what the short-timers couldn’t.
The one that burns people out
The pattern I’ve seen that most reliably shortens effectiveness — not tenure, but actual contribution — is the person who stays but stops updating their model of what good looks like. They hit a level of expertise and then stop being curious about whether that expertise is still pointing in the right direction. Their thinking calcifies. They start defending positions not because the positions are right but because the positions are theirs.
This is different from the person who leaves at the right time. Leaving at the right time is healthy and often smart. The problem is staying while mentally checking out, because over time the gap between their formal authority and their actual contribution becomes visible to everyone, and that gap is corrosive — to the person, and to the team around them.
Sustained effort isn’t about endurance. It’s about staying genuinely engaged with what you’re doing, even as it changes, even as you change. The people who do it well are not the ones who found the right career — they’re the ones who stayed curious enough to keep finding it.