Assembly is a client experience and back-office platform built for tech-enabled professional service firms such as consulting, accounting, law, real estate, marketing, and technology. It replaces scattered tools with a unified, branded client portal where businesses can connect, communicate, invoice, share files, and manage tasks from first sale to full scale. The system centralizes visibility into client relationships across the organization, powered by secure AI assistance to streamline workflows and save time. Assembly integrates easily with existing business tools via embeds, Zapier, Make, or its own flexible API and supports the creation of custom apps. Key features include secure messaging, file sharing, invoicing and billing with one-click payments, contracts and e-signatures, storefronts to productize services, forms, and task management. It is designed to deliver remarkable, modern client experiences while maintaining enterprise-grade security and HIPAA compliance.