Experienced Shopify App Developer Needed

My SaaS-style Shopify app already has users in production, but the Laravel backend now needs the most immediate attention. I want to harden and extend the data-processing layer, then circle back to Vue.js UI tweaks, GraphQL endpoints, and general UX polish... (Budget: $250 - $750 USD, Jobs: API Development, Backend Development, GraphQL, JavaScript, Laravel, MySQL, PHP, RESTful API, Shopify, Vue.js)