A developer gets full pay after the job completion. The job considered completed once all given task requirements are 100% done, tested and confirmed. If you spend long time and hours on the task budgeted but job is not 100% completed there is no payment nominated to the assigned developer. Also if you perform your best and completed all task withing required time frame we welcome that attitude and pay all the funds after the job completion confirmation.
Some developers experience  more and some less. If more experienced developer do once's task for 5 hours this is a measure for our job calculation. Other developers can do same work for 10 ours we respect their effort that it is not the case for the job increase. Here at  Webmaklay we respect both but value experience.