Going back MANY years - I worked on the client Glue Store providing product design, plus producing. Working on retainer, I regularly suggested the next most important design changes and then executed them by providing mockups and prototypes.

Sometimes I implemented design changes with plugins and third party companies (eg. chatbots, analytics tools).

I worked automously on Topshop for Australia. Due to lack of dev resources... I learnt to code front end!

I provided UX/UI deliverables, then executed the changes in UAT in HTML and CSS.