Working in SEO has been a passion of mine as it reminds me of chess games, every move has to be made for a reason and has to serve the whole strategy you're following to ensure winning eventually.
as an SEO Specialist, I would be responsible for:
Analyzing the current site performance
Analyzing the competition performance
Improve on-site performance by using tags and keywords
improving off-site performance by link building
improving domain authority and consequently the page quality score.