Top Senior Level IT Support & Helpdesk Jobs in Phoenix – Mesa – Scottsdale, AZ

Administer and maintain IBM i (AS/400) systems to ensure availability, performance, and security. Perform upgrades, PTF management, capacity planning, HA/DR operations, backups/recovery, incident resolution, and automation via CL/RPG or scripts. Collaborate with application, database, and operations teams and support compliance and change management processes.

Provide 24x7x365 NOC support for ICE OCIO: monitor and respond to alarms, troubleshoot LAN/WAN and SD-WAN, administer Windows/Linux servers, manage firewalls/WLAN and network tools, drive incident resolution, enforce security and SOPs, and prepare performance reports.

Monitor 24/7 internet applications and distributed servers; provide L1/L2 incident and request support for middleware (WebSphere, IHS, Tomcat), MQ, Windows and Linux, and cloud (AWS/Azure). Perform production code deployments, release and disaster recovery support, analyze trends to drive improvements, update procedures, and onboard/train associates while escalating complex issues to business partners.

Install, configure, and troubleshoot Nextiva CCTV application, Windows servers, and client/server hardware. Perform Nextiva 6.4 upgrades and new installs, build Windows servers via HP iLO, integrate Active Directory, and support international operations with flexible hours. Communicate with stakeholders and work in small agile teams.

Provide Level 3 escalation and advanced support for client and internal IT systems. Troubleshoot complex infrastructure issues, develop and document solutions, support projects and key accounts, participate in on-call rotation, and collaborate with engineering, sales, and clients to maintain system reliability.

Lead and manage day-to-day U.S. IT operations across multiple offices: incident/change/problem management, endpoint and asset lifecycle, procurement, onboarding/offboarding, license management, vendor coordination, and operational handoffs to improve service consistency, reporting, and automation.

Provide Tier-2+ technical support for the Axon 911 SaaS platform: troubleshoot platform, networking, and VoIP issues; monitor system performance; manage escalations; document bugs and create knowledge-base content; collaborate with engineering and customer teams to ensure reliability and SLA adherence.

Lead client IT support services and help desk teams; manage support deliverables, Active Directory and Office 365 environments; deploy infrastructure improvements; engage clients and vendors; provide remote and on-premise support and lead initiatives to research and deploy new applications.

Administer and support PeopleSoft environments as a DBA/Administrator. Use STAT tools, manage LDAP and SSL certificates, apply technical and analytical skills, and provide communication and leadership for IT initiatives.

Onsite mainframe operations role installing and maintaining CA product suite and DB2 subsystems, monitoring system activity, performing problem analysis and tuning, and working with users and developers to implement required products. Requires advanced IBM Z/OS and SQL skills and hands-on DB2, CICS, COBOL, Rexx, and related tooling experience.