Professional support of security-relevant sales projects for authorities and other security-sensitive clients from the lead phase to structured handover to project implementation, Analysis of professional, technical, and regulatory requirements of clients and their translation into security-compliant solution and security architectures, Conception and evaluation of secure overall solutions, taking into account security clearance requirements (e.g., VS-NfD and higher), security assessments, and official security specifications, Support of pre-sales activities through technical consulting, professional coordination with stakeholders, and presentation and explanation of complex security architectures to clients, Participation in the creation of service descriptions, offers, and calculations, taking into account legal framework conditions for public procurement, security, and budgeting, Ensuring the consistent adherence to security, security clearance, and compliance requirements throughout the entire sales process, Close coordination with sales, security clearance, and delivery units to ensure a consistent, auditable, and handover-ready solution architecture