There are many online platforms where you can find book review jobs, such as:
1. Upwork: Upwork is a popular freelancing platform where you can find book review jobs posted by authors and publishers.
2. Freelancer: Freelancer is another freelancing platform where you can find book review jobs and apply for them.
3. NetGalley: NetGalley is a website where publishers and authors provide free digital copies of books in exchange for reviews. You can sign up as a reviewer and receive books to review.
4. Online book review websites: There are several websites dedicated to book reviews, such as Goodreads, BookBrowse, and BookPage. You can apply to become a reviewer for these websites and get paid for writing book reviews.
5. Amazon Vine: Amazon Vine is a program where Amazon invites trusted reviewers to write reviews for products, including books. You can apply to become a Vine reviewer and receive free books in exchange for honest reviews.
These are just a few examples of platforms where you can find online book review jobs. Keep in mind that competition for book review jobs can be high, so it's important to showcase your writing skills and experience in your applications.