Same category of bug. Years apart. Wildly different me showing up to deal with it.

The production error at 6pm on a Friday
Junior me: heart rate triples, opens fifteen tabs, considers whether this is the moment my career ends Senior me: sighs, opens one tab, asks "is anyone actually affected right now or is this just noisy logs"

***The "it works on my machine" moment*

Junior me: insists loudly that it works, gets defensive, spends an hour proving a point nobody asked for Senior me: immediately assumes it's an environment config difference, is right within four minutes, mildly annoyed it's always the config

A teammate says "quick question"

Junior me: drops everything, genuinely believes it will be quick Senior me: mentally blocks out 45 minutes, is pleasantly surprised the one time it's actually quick

The bug that only happens in one specific edge case

Junior me: tries to reproduce it forty times, blames the framework, blames the browser, eventually blames the moon
Senior me: asks "what's different about that one input" first, finds it in ten minutes, feels smug for exactly four seconds before finding the next one

Code review comes back with "why did you do it this way"

Junior me: mild internal crisis, rewrites the whole thing out of panic
Senior me: replies "good question, here's why" and either defends it calmly or says "actually yeah let's change that" without any of it meaning anything about self worth

Something breaks and nobody knows why

Junior me: panics, starts changing things randomly hoping something sticks
Senior me: checks what changed recently first, because something always changed recently, it's never actually a mystery

Estimating how long a fix will take

Junior me: "should be quick, maybe an hour"
Senior me: "should be quick, maybe an hour" said with the exact same confidence, still wrong just as often, but now says it while already opening a second monitor out of instinct

The moment the actual root cause is found

Junior me: relief, followed immediately by explaining it to anyone nearby whether they asked or not
Senior me: quiet nod, adds a comment in the code so future-me doesn't have to solve this exact thing twice, closes the tab, moves on

Here's the part that actually surprised me writing this out. The bugs didn't get less annoying. I just stopped taking them personally. That's the whole upgrade. Nobody tells you that seniority isn't about knowing more, it's about your nervous system finally calming down around the same chaos that used to wreck your whole afternoon.

Some days I still take it personally, stare at the screen a little too long, refuse to accept the bug is winning. And then I solve it anyway. Turns out that's fine too. Still hate a bad config file though. Some things don't change.