Two engineers, one product
We,xhub.io
xhub.io is a product of BeeBack UG in Bad Vilbel near Frankfurt, founded by two software engineers with more than 40 years of combined experience from projects for Deutsche Bahn, Mercedes-Benz and SMA Solar Technology. Today we build an e-invoicing API out of it.
2021
Founded in Frankfurt
2
Software engineers
40+
Years of combined experience
21+
E-invoicing formats
Our Mission
E-invoicing is mandatory, yet for developers and online retailers it is still needlessly complicated: three formats, one validation rulebook, and a handful of vendors who address accountants rather than developers. We turn that into an API call — and connect the existing ERP or shop system when the API alone is not enough.
Founders
Patrick Jerominek
CEO & Founder
LinkedInSoftware architect focused on enterprise systems, cloud architecture and e-invoicing compliance. His project experience ranges from corporate digitalization to building proprietary SaaS products. At xhub.io he owns product and architecture of invoice-api — from the XRechnung, ZUGFeRD and Peppol formats through to KoSIT validation. As a bridge between business and technology, he cares that an integration stops demanding attention once it is live.
Torsten Link
CTO & Founder
LinkedInExperienced software architect with deep expertise in quality assurance, test automation, and CI/CD pipeline design. Over 11 years of Node.js and TypeScript development. Led QA strategy for Deutsche Bahn’s passenger information system, architecting test automation across a distributed microservice landscape. His background in building testing infrastructure for complex distributed systems shapes the technical quality of every xhub.io solution.
Our Journey
Enterprise projects
Both founders work as software engineers on projects for Deutsche Bahn, Mercedes-Benz and SMA Solar Technology — architecture, quality assurance and distributed systems.
BeeBack UG founded
Frankfurt am Main, HRB 125402 at the Frankfurt am Main district court. Services turn into a product of our own.
invoice-api.xhub.io
XRechnung and ZUGFeRD via REST API, Peppol BIS 3.0 as a format — KoSIT-validated, GoBD-compliant, with a free tier and integrations for Shopware, WooCommerce, JTL and Shopify.
Location & Contact
Provider
BeeBack UG (haftungsbeschränkt)
Address
Kreisstrasse 5961118 Bad Vilbel
Germany
Two-week sprints
Every sprint ends with a runnable build you can try yourself — not a status report.
Direct line
You talk to the developer who built your integration. No call centre, no ticket queue.
Hosting in Germany
Invoice data is processed in German data centres. A data processing agreement under Art. 28 GDPR is in place.
Fixed price
After the scoping call you get a fixed-price proposal — no time-and-materials billing.