> Markdown version of [/jobs/ext/4639652-senior-onsite-it-support-technician-tier-1-san-diego](https://www.wearedevelopers.com/jobs/ext/4639652-senior-onsite-it-support-technician-tier-1-san-diego). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Onsite IT Support Technician (Tier 1+) - San Diego - **Company:** OSTARI, INC. - **Location:** San Diego, CA, United States - **Experience:** Expert - **Salary:** $70,000 - $72,000 - **Contract:** Permanent contract - **Skills:** Microsoft Windows, Active Directory, Admin Tools, Artificial Intelligence, Microsoft Antivirus, Macintosh Computers, Apple Mac Systems, User Authentication, BitLocker Drive Encryption, Business Software, Microsoft Outlook, Software as a Service, Dynamic Host Configuration Protocol, Desktop Publishing, Domain Name System (DNS), Issue Tracking Systems, Virtual Private Networks (VPN), Python (Programming Language), Network Security, Microsoft Software, Networking Basics, Network Attached Storage (Server Appliance), Windows PowerShell, Remote File Sharing, Azure Active Directory, Anti-Phishing, Microsoft Copilot, Microsoft SharePoint, VPN Clients, Wi-Fi Technology, Git, Microsoft InTune, Microsoft Onedrive, Slack, Deployment Automation, Wikis, 3-tier Architectures, Claude, GPT, User Administration - **Published:** November 8, 2026 - **Apply:** https://www.thejobnetwork.com/job/cdd5fe33-69cc-4a86-a067-f16b36bfcf22/senior-onsite-it-support-technician-tier-san-diego ## About the Role * 4+ years of hands-on IT support in a help desk, MSP or onsite role, including at least 2 years as a senior, lead or go-to technician who resolves most issues without escalation. * Active Directory and Entra ID user administration: onboarding and offboarding, security groups, licensing, MFA troubleshooting and SSO sign-in issues. * Microsoft 365 admin-center experience: SharePoint permissions and external sharing, OneDrive, Exchange Online mailboxes and distribution lists, and Teams. * Microsoft Intune or a comparable MDM for Windows and macOS enrollment, app deployment and remote actions, plus Windows imaging or Autopilot. * Windows 10/11 and macOS support across Dell, HP, Lenovo and Apple hardware, including BitLocker, hardware diagnosis and warranty repairs. * Application support at scale: installing, licensing and troubleshooting business software, and managing vendor support cases. * Networking fundamentals: diagnosing Wi-Fi, VPN, DHCP and DNS problems. * Polished customer service with executives and non-technical users, including staying calm and communicative during urgent issues. * Excellent documentation in a PSA or ticketing system, plus experience writing how-to or knowledge base articles., Active Directory, Microsoft Entra ID, Microsoft Authenticator, SSO for SaaS apps Collaboration, Outlook, Teams, SharePoint, OneDrive, Zoom, Slack, team wiki and project-tracking tools Devices, Windows 11, macOS, iPadOS, Dell, HP, Lenovo and Apple hardware, Intune Network and security, VPN Client, Wi-Fi, Microsoft Defender,Claude, ChatGPT, Microsoft Copilot,PSA, RMM, Document Platform Work requirements * Onsite in San Diego, Monday-Friday, 8:00 AM-5:00 PM. * Occasional after-hours work, such as maintenance windows and planned power shutdowns. * A current driver's license, reliable transportation. * U.S. citizenship is required for this position. * Able to lift and move equipment up to 50 lbs, such as laptops and monitors. ## Description Ostari is hiring a Senior Onsite IT Support Technician for fast growing, fast-paced San Diego clients. You will resolve most requests Independently, for employees, operations staff and executives. Tier 2 and tier 3 issues will be escalated to Ostari's senior engineers for guidance. This role is for a seasoned support professional who has advanced hands-on help desk experience and wants more ownership: admin rights in Microsoft 365, Entra ID and Intune, a seat at each client's monthly IT and security reviews, and a varied environment, from executive offices to specialized equipment, where your judgment matters. You'll be trusted to run the site, not just work the queue., The areas below are listed in order of how often they come up, based on a year of first-line support requests from the San Diego clients this role supports. * Deliver white glove executive experience. Provide priority support for key decision makers. Ensure smooth all-hands meetings and leadership events by providing proactive support. * Own accounts and access end to end. Run onboarding and offboarding for employees, temps and contractors across Active Directory and Entra ID. Manage security groups and licensing, resolve MFA and Authenticator issues, and troubleshoot SSO sign-in problems with SaaS applications. * Administer Microsoft 365 for users. Manage SharePoint site permissions and external sharing for partners, OneDrive sync, shared mailboxes, distribution lists, room calendars and Teams settings from the admin centers. * Document and improve. Keep thorough Autotask notes, maintain IT Glue documentation and knowledge base articles, and suggest fixes for recurring issues. * Manage file sharing access. Grant and audit network drive and NAS access through AD groups, including Macs, and handle file restores. * Act as a security first responder. Triage phishing reports, quarantined email and Microsoft Defender alerts, contain affected devices and accounts using Ostari's runbooks, and escalate per SLA. * Run a mixed Windows and Mac fleet onsite. Set up and repair Dell, HP, Lenovo and Apple laptops and iPads through Intune and Autopilot, handle BitLocker recovery, and drive Windows 11 upgrades. Manage docks, monitors, loaners, printers, scanners, and warranty claims. * Manage software and licenses. Install, license and support business, engineering, document design, team wiki and product-lifecycle applications, track renewals, run user audits and work vendor support cases to resolution. * Be the point person for specialized and production systems. Support cleanroom and production-line PCs, equipment-connected computers, label printing software and quality-management system access. Coordinate with equipment vendors, keep device records current, and follow each site's change-control procedures. * Handle AI and developer tool requests. Provision and support Claude, ChatGPT and Copilot, including enterprise SSO and licensing, and set up Python, Git, WSL and VS Code within policy. * Support Facilities. Manage badge access, conference room AV for Teams and Zoom, the lobby check-in kiosk and displays. * Resolve connectivity issues. Troubleshoot Wi-Fi, wired and VPN connections, DHCP and DNS, and prepare well-documented firewall requests for senior engineers., * PSA, RMM, and other Standard MSP support tools * PowerShell for user administration and reporting. * Certifications such as Microsoft MD-102, AZ-104, MS-900, CompTIA A+, Network+ or Security+. * VPN client, and WiFi troubleshooting. * Microsoft Defender alert triage and phishing response. * Setting up Python, Git, WSL and VS Code for engineers and other technical users. Why this role * Real ownership. You'll be the clients' trusted onsite IT lead, with admin access to do the job instead of escalating routine work. * A senior team supporting you. Ostari's Tier 2, Tier 3, and security engineers are available for the hard problems, and you'll work alongside them on project. You'll thrive here if you * Take full ownership of the site and follow every request through to resolution. * Stay organized and keep team members informed when several urgent requests land at once. * Notice recurring problems and push to fix the root cause instead of re-closing the same ticket type. * Are curious about how specialized equipment and new tools work and follow procedures carefully. * Enjoy collaborating with others and sharing what you know through clear documentation. Tech Stack you will work with