Front end Engineer for Saas Business Payment Platform

Summary We are building SEMATRIX Pro, a new multi-tenant B2B SaaS platform designed to become a unified Business Operating System for professionals and growing businesses. This is not a website project and we are not looking for a basic MVP built from templates. The platform will bring multiple areas of business operations into one connected system, including: • CRM & client management • Projects, tasks & workflows • Invoicing & financial operations • Employees & workforce management • Files & document management • Forms & e-signatures • Calendar & scheduling • Client portals • Reporting & dashboards • Workflow automation • AI-powered business assistance • Multi-business management The key architectural challenge is that these cannot operate as disconnected applications. Clients, companies, employees, projects, invoices, documents, communications, permissions and activity must share a properly designed business data foundation. We are looking for a senior engineer/architect who has personally built production multi-tenant SaaS applications, preferably CRM, ERP, accounting, fintech, workforce management, operations software or other complex B2B platforms.