SENIOR SYSTEMS & INFRASTRUCTURE ADMINISTRATOR
First seen by Alion on Oct 15, 2026.
MAINFRAME
(PRIVATE) LIMITEO
WE ARE HIRING!
Mainframe (Pvt) Limited is a fully owned subsidiary of Sumathi
Holdings (Pvt) Limited, located in Colombo-03. We are hardware solution and service providers, renowned for our efficient work ethic and structured methodology. Our commitment lies in delivering top-notch technical solutions in the hardware domain.
We are looking for a Senior Systems & Infrastructure
Administrator to join our infrastructure team, supporting IT operations across a diverse group of companies spanning multiple industries. This role will be responsible for day-to-day IT operations, including helpdesk support, endpoint and directory administration, infrastructure monitoring, troubleshooting, and vendor coordination.
SENIOR SYSTEMS AND INFRASTRUCTURE
JOB DESCRIPTIONS ADMINISTRATOR
Helpdesk & Ticket Management
« Own and triage the day-to-day IT support ticket queue across departments and group companies.
« Resolve L1/L2 issues directly; escalate complex or architecture-level issues to the upper level.
« Track SLA adherence per the severity-based support framework and flag breaches early.
Directory & Identity Administration
« Manage Active Directory and Microsoft 365 / Entra ID: user/mailbox provisioning, deprovisioning, password resets, group and license management.
« Execute onboarding/offboarding checklists across the group companies.
Maintain routine Exchange Online and Entra policy hygiene (retention, MFA enrolment, guest access reviews) as directed.
Endpoint & Mobile Device Management
« Monitor CrowdStrike EDR alerts across 1,500+ endpoints; triage and action known/low-risk alerts, escalate suspicious activity immediately.
- Manage SOTI MobiControl enrolment, policy pushes, and routine troubleshooting devices.
- Coordinate endpoint patching and OS update rollouts.
Network & Systems Monitoring
« Monitor the firewall, switch, and server health; log and respond to first-level alerts.
« Perform routine health checks on switches and firewalls (status, interface, POE)
« Verify backup job completion and report failures.
Vendor & Procurement Coordination
« Handle routine vendor calls, warranty/renewal tracking, and hardware/software procurement follow-ups.
Coordinate with vendors (ISPs, security, hardware) on standard service requests.
Documentation & Reporting
- Maintain up-to-date SOPs, asset records, and configuration documentation.
- Produce weekly status summaries for the manager covering tickets, monitoring, and outstanding items.
REQUIREMENTS
« Bachelor's degree/Diploma in IT, Computer Science, or a related field.
3+ years of hands-on experience in system/network administration.
« Working knowledge of Active Directory, Microsoft 365/Entra ID administration. oe e
« Good understanding of firewalls, managed switches(Fortinet/Juniper/Cisco a plus), Windows, and Linux. e 8
« Comfortable working with a ticketing system and following SLA-driven processes. sss
« Good written and verbal communication in English and Sinhala.
Willingness to work in an ISO 27001-certified environment and follow documented procedures.
SUMATHI HOLDINGS (PVT)LTD SUBMIT YOUR CV
Q No.491, Galle Road, Colombo 3
SUMATHI HOLDINGS
- Employment: Full Time, Permanent, Onsite
- Closing date: 23 Oct 2026
- Job ref: 1560762