How can I tell if I’m too comfortable?

When I'm getting bored, usually it’s a sign. If I do the same things in the same way and I feel that it's not challenging anymore, and I cannot pay that much attention. A good analogy would be, I do Brazilian jiu-jitsu, and that's very easy to see whether you're in comfort zone or not because you have immediate feedback loops and they are not very nice feedback loops! You can tell you're not paying attention, you're going mechanically and you don't have to be alert and you don't have to prepare, and I see that at work if I do the same thing several times. Especially at the end of my technical career, I was like, ‘Yeah, I've done this, created this system 20 times, I'm getting bored. I just do the same thing.’

And I start feeling that I'm not engaged and I don't need to pay much attention to whatever task I'm doing. It's like, ‘Now it's time to change’.