There are imposters around us; they pretend to be doing their work but are actually creating problems for their coworkers to solve. They are starting fires around workplaces that we all have to put out. The only issue is that companies are trying to get people to practise teamwork and they are not trying to sniff out imposters who are just pretending to be teammates. Unless you start playing office politics and all that.
What this means is that if you have been doing well, and keep doing well even though you didn’t seem to have previous experience or built any credentials around it, you’ve already proven yourself. What this means is that if you have some suspicion about yourself as an imposter, consider your intentions rather than your qualifications. What makes you an imposter is when you have drastically different intentions from the rest of the team.
It’s not just your qualifications that gets you there. It’s your intentions as well.