Hideo Tosaka
Nanuet,NY
Summary
Helpdesk and Network Technician with deep experience across Microsoft 365, Entra ID, SonicWall firewalls, RMM tooling, and backup platforms. Support ~190 endpoints at 21 client sites, resolving complex issues and improving system reliability. Delivered multiple cloud-migration projects—Active Directory decommissioning, SharePoint migrations, and Microsoft 365 adoption—while contributing to disaster recovery, security hardening, and infrastructure modernization.
Overview
3
3
years of professional experience
Work History
Helpdesk and Network Technician
Corstar Communications LLC
07.2022 - Current
- Provide Tier 1–2 support for ~190 endpoints across 21 client sites, resolving hardware, software, and network incidents within SLA targets.
- Troubleshoot issues via Kaseya, Datto RMM, and Autotask; escalate efficiently when required to meet client expectations.
- Perform full employee onboarding/offboarding including account provisioning, MFA setup, license assignments, and workstation preparation.
- Administer Microsoft 365 and Entra ID: users, groups, shared mailboxes, conditional access, MFA, and device compliance policies.
- Configure and troubleshoot SonicWall firewalls, VPN tunnels, NAT policies, and site-to-site connectivity.
- Manage Veeam, Datto, and Carbonite backups; complete daily monitoring, test restores, and integrity validation.
- Deploy and maintain switching, Wi-Fi access points, VLANs, DHCP/DNS, and general workstation/network installations.
- Support disaster recovery efforts by assisting senior engineers with system restores, failovers, and environment validation.
- Manage SharePoint/OneDrive permissions, storage issues, sync conflicts, and data recovery.
- Diagnose Windows OS issues including performance degradation, driver conflicts, and domain connectivity failures.
- Deploy and monitor endpoint protection tools (SentinelOne, RocketCyber, Graphus) and enforce security baselines.
- Perform workstation imaging, application installations, profile migrations, and full lifecycle replacements.
- Maintain documentation, SOPs, network diagrams, and troubleshooting runbooks for all client environments.
- Reduce ticket volume by proactively identifying recurring issues and conducting scheduled preventive maintenance.
- Coordinate with ISPs, VoIP providers, and hardware vendors to resolve escalated client issues.
- Conduct user training on security best practices, Microsoft 365 usage, and proper endpoint hygiene.
- Coordinate with external vendors for infrastructure needs including fiber installations, ISP services, printers, server hardware, and battery backup systems.
- Led multiple client projects migrating on-prem environments to cloud services including Microsoft 365, SharePoint, and Entra ID.
- Performed domain migrations from on-prem Active Directory to Entra ID and decommissioned legacy domain controllers.
- Migrated client file servers to SharePoint Online, restructuring permissions and ensuring clean cutover with minimal downtime.
Education
Bachelor of Arts - Biology and Anthropology
Queens College
FlushingSkills
- Operating Systems: Windows 10/11 Windows Server 2012 – 2022 Linux (Debian, Arch) macOS (limited)
- Identity & Cloud: Entra ID (user/group management, SSO configuration, device compliance, access policies) Microsoft 365 Exchange Online Entra Security / Purview (familiar)
- Backup & Recovery: Veeam Datto (RMM, SaaS, BCDR) Synology NAS Carbonite
- RMM / Security Tools: KaseyaOne Suite (Autotask, Datto RMM, BullPhish, Network Detective, DarkWebID, Graphus, RocketCyber) SentinelOne
- Networking & VPN: SonicWall (primary) SonicWall VPN DHCP/DNS Management VLANs Equipment Installation Wi-Fi Configuration & Limited Site Surveys
- Pentesting & Security Validation: VM or dedicated device setups test scheduling analysis remediation documentation
- Collaboration & Support: Microsoft Teams Slack Zoom TeamViewer AnyDesk Quick Assist Bomgar (BeyondTrust)
Timeline
Helpdesk and Network Technician
Corstar Communications LLC
07.2022 - Current
Bachelor of Arts - Biology and Anthropology
Queens College