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After more than 13 years, and tens of thousands of questions, Moz Q&A closed on 12th December 2024. Whilst we’re not completely removing the content - many posts will still be possible to view - we have locked both new posts and new replies. More details here.
If it was me, I'd find a reputable marketing firm first, and then see if link building or offsite optimization is one of their marketing tactics of their overall marketing strategy. I wouldn't hire or use a company that solely build links. It might hurt you in the long run.