Listen to your manager or spend 5 minutes on LinkedIn and you will finding yourself striving to give 100% or sometimes even 110%. I've even seen times where 110% is not enough and you have to give 200%.
As well as being mathematically impossible and stupid this maximising of effort is actually bad engineering and even worse design.
I like to think of myself as a designer and not a programmer, I also think I'm a pretty good designer and on the journey to becoming a good designer I've learnt a few harsh truths. You can learn these hard way, or I may save you some frustration if you learn them here.