ZendWerk is an all-in-one business management platform for German trade and craft businesses (Handwerksbetriebe) such as electricians, HVAC, roofers, painters, and general contractors. It combines quotes and invoicing (including GAEB import and ZUGFeRD/XRechnung e-invoicing), CRM, mobile time tracking, crew and site scheduling, construction site documentation, material and equipment management, accounting with DATEV export, and a customer portal in one connected system, replacing the mix of paper, spreadsheets, and disconnected apps many trade businesses rely on today. Data entered once (customer, quote, project) flows through automatically to invoicing and bookkeeping. ZendWerk is hosted in Germany, works on desktop and mobile including offline on job sites, and includes built-in support for compliance documentation relevant to German construction businesses (Schwarzarbeitsbekaempfungsgesetz / FKS readiness).