Own the technical workstream for complex enterprise payment opportunities from discovery through contract signature. Partner with Sales on deal strategy, executive presentations, RFI/RFP responses, and technical positioning. Architect secure integrations across POS, eCommerce, mobile, APIs, payment orchestration, and data systems, particularly for European markets. Support strategic account expansion, create reusable architecture assets, collaborate with Product and Engineering, and mentor Sales Engineers. Travel across Europe for client meetings, workshops, and go-lives.