Imposter syndrome & at what point did you realise you where a developer

Imposter syndrome is something I have often felt in my journey to becoming a developer.
I am self taught (mostly), and was lucky to be given a chance at a growing start up (Strattic).
My first few weeks where filled with fake it until you make it, with many late nights and LOOOOTS of caffeine. But I after a couple of weeks I sat down with the team to show what I had achieved and I amazed myself.
I look back on that code now and laugh, and am amazed that not only does it still work but some of that code still on production (with a lot of refactors and help from much more experienced devs).
Did you have an AH HA! moment when you suddenly realised you where keeping up with the big boys?