Web App Developer for Content Scheduling & Auto-Posting Tool (Instagram/Facebook/LinkedIn API)

I'm building "Autopilot My Brand" a multi-client SaaS platform that automates personal branding by scheduling and auto-posting content to social media for multiple users/clients. Looking for an experienced developer with real multi-tenant SaaS experience. I want to launch in phases: a lean Phase 1 MVP first, then expand. Phase 1 (target: 1-3 months) core MVP: -User signup/login and per-client dashboard (basic multi-tenant setup isolated accounts/data) -Connect social accounts via OAuth, starting with 1-2 platforms (Instagram + TikTok, or your recommendation) -Upload/input content (text, image, video) and schedule posts -Auto-posting engine that publishes on schedule via the platform API(s) -Basic paid signup/access (simple Stripe integration doesn't need to be a full billing system yet) Phase 2 (later, scope/timeline TBD based on Phase 1 results): -Additional platforms (LinkedIn, X) -Full subscription/billing system with plans, upgrades, cancellations -Admin panel for me to oversee all client accounts -Expanded analytics per client What I'd like from you in your proposal: -Your experience building multi-tenant SaaS products (not just single-user apps) please share examples -Relevant experience with social media API integrations (Meta/Instagram Graph API, TikTok API), since platform approval/rate limits are often the biggest bottleneck -Experience integrating Stripe or similar payment systems -Your recommended approach (framework/stack) and why -Your estimated timeline and cost for Phase 1 specifically, quality and the right experience matter