SEO Setup for Squarespace Launch

I'm migrating my website to Squarespace from flothemes and need one-off SEO work to maintain my search engine ranking before launching the new site.

Tasks include:
- Add alt tags to all images
- Write meta descriptions for 7 pages and 10 blog posts
- Add backlinks and check redirects
- Possibly edit copy for keyword optimization

Ideal skills and experience:
- Proven SEO expertise
- Familiarity with Squarespace
- Experience with alt tags, meta descriptions, and backlinks
- Knowledge of long-tail keywords

I have a list of specific keywords I would like to target.

Thank you.