Development of Sales/CRM SaaS Software in PHP

Looking for an experienced developer for development of SaaS based Sales/CRM software with the following features: APPLICATION FEATURES: - SaaS/multi-tenancy: support for IP blacklisting/whitelisting, custom domain mapping etc., option to choose subdomain ([login to view URL], [login to view URL]) - company/client accounts management - contact management - lead management - opportunity tracker (grid, list and kanban view) - quote & contracts management - intra-company conversation management - marketing email management - marketing campaign form management - sales chat & ticketing system - appointments, meetings & tasks management - dashboard & reporting (customizable dashboards) - user management with roles - email notifications - workflow tracking - import & export options for all modules - web analytics integration e.g. Google Analytics - sales targets and performance management - territory management - sales forecasting - email client integration - social media integration - each module should be enabled based on pricing slabs and plans (e.g. sales chat module will be available for plan 1, but not in plan 2) - plan restrictions should have options to set limits at every level (e.g. plan "A" will have 1000 emails free & extra emails will be charged at $1/month/1000 emails. Plan "B" will have 10000 emails free & extra 1000 emails will be charged at $1/month/5000 emails etc.) - development should be clearly defined as follows: backend should be powered by REST APIs; frontend should be responsive and should support i18n; templating engine to be used; REST APIs should be usable for future mobile app development ADMINISTRATOR SAAS FEATURES: - SaaS customers - Pricing plan & module selection - Stripe Payment and recurring (auto-renew) subscriptions to be enabled - option to enable coupons & trial plans - privacy policy and terms & conditions settings Detailed information will be provided along with flowchart, process flows prior to commencement of work. Development company to support the project for future releases.