Antonio Martínez (assumed: Head of Hardware/Engineering at Pundi X)

Accountable for engineering delivery of point‑of‑sale firmware, secure element changes and wallet APIs that enable on‑device token settlement. Those engineering outputs required specification of supported token standards, gas handling, signature flows and offline reconciliation processes; technical choices here determined which tokens could be practically accepted in merchant environments and how settlement finality was achieved. Martínez's hardware engineering role at Pundi X involved bridging the gap between blockchain transaction finality and real-world point-of-sale constraints, including offline operation, low-latency settlement, and secure element management. The technical decisions embedded in XPOS firmware determined the practical user experience for merchants and customers transacting in crypto at retail environments, making his work a concrete test of blockchain technology's viability in everyday commerce.