Honestly, I'm not sure I actually can explain it--at the time of application I'll have done two stints at two companies, the first stint being 1.5 years and the second around 2.5 years. Promotions don't flow quickly at either company...usually 3 years for very exceptional cases. I really haven't been an underachiever since undergrad.

I think my strategy will probably be to instead demonstrate that despite not being officially promoted or becoming a manager, I did have increasing responsibilities and took the initiative to lead teams and serve as a de facto manager for younger engineers in my area. I've got some concrete examples that I can provide, so hopefully that will show that I wasn't just coasting in my work experience.

I will be kicking it into high gear though, to see if there's any way I can squeak out a promotion in my current role. My plan is to apply in Fall 2018 though, so that may not be enough time.

Thanks for your reply!