Have you worked with Mitte / Kreuzberg / Prenzlauer Berg DTC clients?

Yes, anonymised because of strict DACH NDA culture, but the case-study angle is real. We shipped Magento 2.4 + Hyvä for a Kreuzberg streetwear DTC: Klarna + Sofort + SEPA Direct Debit tri-rail (90% of German consumers prefer one of these three), GoBD-compliant 10-year invoice archive auto-generation, ZUGFeRD hybrid PDF e-invoicing for B2B wholesale customers, Hetzner Berlin hosting at ~30% the cost of AWS Frankfurt, Christmas peak survived 25× normal with sub-200ms TTFB across Germany. For a Mitte B2B distributor we built USt-IdNr-gated trade pricing, SEPA Direct Debit + Net-30, role-based catalogues per customer-tier, XRechnung output into the customer's SAP SD module via Peppol. For a Prenzlauer Berg DTC boutique we did a full Hyvä Checkout install + Klarna Pay Later + Sofort + multi-language DE+EN. References available on signed NDA, DACH culture demands brand-name discretion.