The requirement is essentially the ability to develop WordPress sites from scratch, i.e. not with an existing theme. Your basic toolkit should include: expert level in HTML/CSS, Saas, ACF, etc.
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We are are an interactive agency that builds WordPress websites as a subcontractor for other agencies. We have been in business for 13 years and have built over 1000 custom websites.
Remote work is fine and you must have 2 examples of PSD to WP work. No 'off the shelf' themes please.