Communication.

I started coding at Engineering school (so like 4 yrs ago) and even if there were projects by group, I kinda learned it all the way by myself so I actually learned to code alone. And to resolve my issues alone.

And it costs me a job right after my internship. Was a big problem since I was almost alone (someone worked also on it but they was on multiple project at the same time so not 100% available).

That was one of my biggest fear in my career and one of my biggest challenge too in my personal development.

And so, like 8 months later, I got a job, I'm in a big team and no more problem of communication. That's something I'm very proud of. But I'm still young in my career.