Click to Sign Module for Custom CRM System

Full development of the electronic document signing module "Click to Sign" from scratch for a custom-built CRM system.
Design and implementation of the module architecture.
Creation of the database structure and its integration into the existing MySQL schema.
Development of reusable and customizable document templates.
Implementation of PDF generation, display, and signature overlay.
Integration with internal CRM data: projects, contacts, document database.
Implementation of one-time signing links with expiration and access control.
Building signing logic with status tracking, logs, and error handling.
Development of notification system (email and SMS) with templates.
Creation of front-end signing interface with responsive UX.
Testing, deployment to production, technical documentation.

Stack and technologies used:
PHP 8.3 (OOP), JavaScript, MySQL, RedBeanPHP ORM, FPDI, FPDF, Ghostscript, ImageMagick, pdftoppm, mutool, + custom utilities for PDF processing and rendering.