Coming Up Today
The specific kind of work friendships Sentinels build
What shifts when one of you suddenly outranks the other
One tip for each Sentinel personality type stepping into a leadership role over former peers
You may have been leading for years without anyone calling it that.
If you’re a Sentinel – an ISTJ, ISFJ, ESTJ, or ESFJ – there’s a good chance you were already the colleague holding institutional memory, covering for people, catching things before they broke, and quietly keeping the unglamorous parts of work running.
Then a title arrived. And suddenly the same work started meaning something different.
Maybe a colleague who used to be your partner in keeping things running is now reporting to you, and the easy “I’ll handle this one if you grab the next” favor-swapping feels different to bring up.
Or maybe it’s the reverse: a former peer is now your boss, and you find yourself hesitating before sending one of those small “hey, just FYI” heads-ups you used to send each other a hundred times a week. Suddenly you’re not sure if it counts as helping or as overstepping.
Today, we’ll get into both sides of that shift – what changes when you step into leadership over former peers, and what changes when one of those peers becomes the one leading you.
Let’s jump in!
The Kind of Work Friendships Sentinels Build
A Sentinel work friendship doesn’t really announce itself. It accumulates – through the meeting someone covered when you were sick, the file someone organized that you’d forgotten about, the awkward situation someone quietly smoothed over before it became anyone else’s problem, the new hire someone took under their wing because no one else had.
After enough of those small moments, two colleagues start operating almost like a team within a team. You handle this, I’ll handle that. We both know what good looks like. Neither of us needs to be told.
That kind of trust takes time to build. It can also shift faster than you’d expect when one of you becomes the other’s manager.
When One of You Becomes the Boss
The team-within-a-team dynamic is great when you’re peers. It stops working the same way the moment one of you is the boss.
If you’re the one stepping into leadership, your world suddenly gets bigger. You’re not just balancing work with one trusted colleague anymore – you have a real team to manage, with more people, more priorities, and more competing needs. And the tight pact you had with one specific friend can start to look like favoritism from the outside. What used to be loyalty between two equals can read, to the rest of the team, as you leaving them out.
So you start having to be more deliberate. Less “team within a team,” more “leader of the whole team.” Even when no one says anything, you can feel the shift – and your former peer can feel it too.
The reverse can feel just as complicated.
When a former peer becomes your manager, you may still have the instinct to help your colleagues the way you always did – stepping in when someone’s overloaded, smoothing things over before they become bigger issues, keeping the small frustrations between the two of you.
Escalating issues to leadership has always been part of the job. But when your manager is also a close friend, those conversations carry more weight. You used to talk about problems as equals – two people figuring out how to understand or work through an issue together.
Now one of you can act on what gets said. So when a teammate is underperforming, or you’re carrying more than your share because someone else is dropping the ball, telling your friend-turned-boss feels different from comparing notes with a peer.
For some, the discomfort is about loyalty – saying something that feels like it should have stayed among colleagues. For others, it’s about where the line sits now, when a casual heads-up becomes a formal escalation.
This doesn’t happen in every friendship, of course. Some relationships adapt smoothly. But it’s still worth naming. Power changes things, even when everyone involved cares about doing right by each other.
Not sure if you’re a Sentinel? Take our free personality test. It has a 91.2% accuracy rating and only takes 10 minutes to complete.
4 Tips for Sentinels Navigating the Shift from Peer to Leader
Once you understand how leadership changes the dynamic of Sentinel work friendships, the next step is learning how to protect the parts of those relationships that matter most.
Below, we’ll look at one practical leadership tip for each Sentinel type to help make the transition from peer to leader a little smoother.
Here goes:
