Full-stack developer to finish integrations & app approvals for a Saudi e-commerce analytics SaaS

We run a live Arabic SaaS that gives Saudi online merchants one dashboard for their store, ads, and social analytics. Most of the integrations are already built and several are approved. We need one experienced developer to finish the remaining items, get the last apps approved, prove each integration with real data, and stay with us long-term for follow-ups. Scope: 1. Zid app: already approved - switch it to live/active. Review Zid's emails to confirm whether they require our pricing split into 2 plans and apply it if so. 2. Salla app: update the app, its description and the existing plans as Salla requested (check their emails for whether 2 plans are required), then get final approval. Join the meeting with the Salla team. 3. Salla & Zid data sync: move from API polling to webhooks, as both platforms require. 4. Shopify app: connect our paid plans to Shopify Billing and submit for review. 5. TikTok Ads: create the app, choose scopes, submit, complete account review. 6. Meta (Facebook/Instagram): fix Instagram messages not reaching our webhook, set up ads permissions, record the review video, submit for App Review. 7. Google Trends: obtain official API access. 8. LinkedIn: company-page analytics (Community Management API) - app setup, screencast, Standard tier review. 9. Fix Instagram metrics showing zero and Instagram trends returning partial results. 10. TikTok account analytics: views, growth rate, and video list. 11. Visitor tracking (self-hosted Matomo): currently not working - get it working on our own store and dashboard first, then auto-install it in the Salla, Zid and Shopify store scripts so every connected store reports its visitors. 12. Run small real ad campaigns (Meta, TikTok, X) and confirm the numbers in our dashboard match each platform. Stack: Next.js (App Router), React, TypeScript, Supabase (Postgres, RLS, RPCs), Nango (OAuth), Inngest, Docker/Coolify on a VPS. Must have: - Proven experience getting apps approved on Meta App Review and on at least one of Salla / Zid / Shopify / TikTok. - Experience with webhook-based integrations (Salla/Zid webhooks a big plus). - Strong Next.js + Supabase. - Arabic speaker strongly preferred (meetings with Salla/Zid are in Arabic). - Available long-term: attends meetings in Saudi time, applies review notes from the platforms, and hands over everything at the end. How we work: fixed price, paid per milestone. Each task is accepted only with proof (screen recording or screenshots of real data / approval status). Code goes through a branch and review before production. When you apply, tell us: - Which of these platforms you have personally taken through app review. - Your price and timeline per milestone (or for the whole scope). - Start your proposal with the word "Integrations" so we know you read this.