Sr Administrator (Support & Operations)

Job Summary

Assess infrastructure impacts arising from the email domain migration, define the required technical changes, coordinate specialist infrastructure teams, and drive infrastructure actions through testing and production closure.

Key Responsibilities

Key responsibilities

• Perform an end-to-end infrastructure impact assessment across relevant environments and integrations.
• Identify and coordinate required changes for DNS, certificates, mail routing, SMTP/relay, connectivity, servers, interfaces, monitoring, and backup/restore.
• Validate certificate subjects/SANs, renewal needs, trust chains, endpoints, technical accounts, notification settings, and external dependencies where applicable.
• Produce an infrastructure implementation plan with owners, prerequisites, sequencing, test evidence, rollback steps, and support requirements.
• Coordinate with network, server, messaging, cloud, security, SAP Basis, and supplier teams; track dependencies to closure.
• Support SIT/UAT preparation, cutover rehearsal, production implementation, verification, troubleshooting, and hypercare.

Skill Requirements

Mandatory skills and experience

• Hands-on knowledge of DNS, TLS/SSL certificates, SMTP/mail routing, network connectivity, Windows/Linux servers, proxies/load balancers, and environment configuration.
• Experience performing technical impact assessments and translating findings into controlled implementation and rollback plans.
• Experience coordinating multiple infrastructure towers and third-party providers.
• Strong troubleshooting, documentation, evidence collection, and change-control skills. Preferred skills
• Experience with SAP infrastructure, SAP BTP, Microsoft 365, Exchange Online, Entra ID, or hybrid identity.
• Relevant Microsoft, cloud, networking, Linux/Windows, or ITIL certification.
• Experience in enterprise domain, tenant, identity, or messaging migration.

Other Requirements

Expected deliverables

• Infrastructure impact assessment and dependency register.
• Inventory of affected endpoints, certificates, DNS records, mail-routing components, servers, interfaces, and owners.
• Detailed implementation, validation, and rollback plan.
• Change records and technical configuration evidence.
• Test support and defect-resolution records.
• Production cutover checklist and infrastructure handover documentation.