Hi,
I use high neat and clean coding, most optmized coding, search engine friendly coding, systematic coding and so my sites are high fast to load and high search engine friendly. My site are easy to upgrade later.
I am one of the most experts on upwork with more than 10000 hours and many fixed project experience.
I work myself and so work quality will be high. If a company works then they will use programmers of different experience and so coding quality won't be high.
I worked on big sites a lot. [login to view URL] and [login to view URL] with more than hundred thousand products. I have strong knowledge on ssh and so it is easy for me to manage any big size site.
I also have knowledge on managing server which is also helpful to manage big size site.
I also made a lot of magento extensions which require highest level knowledge on magento. Please see my magento selling site [login to view URL]
Please compare some of my magento sites's loadtime and quality with others on the softwares ([login to view URL], [login to view URL] and [login to view URL] (though in some sites I did not work for loading speed and quality). Please remember no cache or cdn is used and sites are on shared hosting, not on dedicated hosting.
[login to view URL] (magento2, below 2 seconds to load, though it has hundred thousand products and a lot of extensions)
[login to view URL] (magento2)
[login to view URL] (fast to load)
Regards
Subir