Hello there, i read your description and i am interested in working with you.
I have been a CS player since CS1.0 really, i played them all, and although i dont have the time to play right, this whole eco system of steam trading has captured my attention a few months, ago i spent some time investigating, how it works and what is needed to get one up and going, as of right now i am writing my own CS GO trading site. I am not planning to publish it, i just want to learn how it works.
Now the site you linked i went through it logged in with my steam account and checked out its features.
From what i can see its a steam item stats collector mainly the pricing part of it.
Skills you mentioned bootstrap, php,html,js and highcharts are all things i have worked on before. Only exception is python, i havent learnt python, but since you said we need it for scrapping, we can always use scrappy for PHP or for really complex sites, we use slimerjs.
a couple of questions :
-will you be doing the part with calculator and subscription model?
-will you be using the bitcoin model for the buy keys thingy?
you mentioned there will be no gambling.
Dont worry maths is strength of mine(me being asian :P).
Payment 75% to be released once the project is uploaded and initial requirements are met.
remaining 25% after one week the project has been uploaded and tested,
Future bug fixes for free, changes will cost.
Hope to hear back from you to talk further
Have a nice day