Job Title: L3 Systems Engineer – Infrastructure & Cloud (Windows/ Linux/ M365/ Network/ Security)
Role Overview
We are seeking a highly skilled L3 Systems Engineer responsible for design, troubleshooting, and optimization of enterprise IT infrastructure across Windows, Linux, Microsoft 365, and Network/Security domains. The role requires deep technical expertise, incident resolution ownership, and proactive system improvement in a 24/7 enterprise environment.
Location: Technopark Phase 1, Trivandrum
Key Responsibilities
Infrastructure & Systems (Windows/Linux)
- Manage and troubleshoot: Windows Server (2016–2025), Active Directory, GPO; Linux servers (RHEL, Ubuntu, CentOS)
- Handle: AD replication, DNS/DHCP, OU design; Patch management, OS hardening
- Lead: Server build/migrations, upgrades, and DR planning
Microsoft 365 / Entra ID
- Administer: Microsoft 365 (Exchange Online, Teams, SharePoint, OneDrive); Microsoft Entra ID (Azure AD)
- Manage: Identity lifecycle (JML); Conditional Access, MFA, PIM
- Troubleshoot: Mail flow, hybrid setup, federation issues
Networking (L2/L3)
- Configure & troubleshoot: Switching (VLANs, STP, trunking); Routing (Static, OSPF, BGP basics)
- Manage: LAN/WAN connectivity; Network performance and latency issues
- Work with: MPLS, VPNs, Internet breakout
Security & Firewalls
- Configure & manage: Firewall policies (Fortinet, Palo Alto, Cisco ASA, etc.)
- Handle: NAT, ACLs, VPN tunnels (Site-to-Site, SSL VPN)
- Support: Security audits, VA/PT remediation; Log analysis and incident response
Incident & Problem Management
- Act as L3 escalation point
- Perform: Root Cause Analysis (RCA); Problem management
- Ensure: SLA adherence; Minimal downtime
Automation & Optimization
- Develop scripts using: PowerShell, Bash
- Automate: User provisioning; Monitoring & alerting
- Optimize: System performance and cost
Documentation & Compliance
- Maintain: Architecture diagrams; SOPs, runbooks
- Support: ISO 27001, SOC 2, audit readiness
- Ensure: Change management (CAB process)
Technical Skills Required
- Core Skills
- Windows Server + Active Directory (Expert)
- Linux Administration (Intermediate–Advanced)
- Microsoft 365 + Entra ID (Expert)
- Networking fundamentals (CCNA level minimum)
- Firewall & security concepts
Tools & Technologies
- Azure / AWS (basic to intermediate)
- Monitoring tools (Zabbix, SolarWinds, PRTG, etc.)
- Backup tools (Veeam, Acronis)
- SIEM (optional – Sentinel, Splunk)
Scripting
- PowerShell (mandatory)
- Bash (preferred)
Qualifications
Bachelor's degree in IT / Computer Science or equivalent
Certifications (preferred):
- Microsoft (AZ-104, MS-102)
- Cisco (CCNA/CCNP)
- Linux (RHCSA/RHCE)
- Security (Fortinet NSE, Palo Alto)
Experience
Overall 15+ years of experience out of which 5–10 years experience in enterprise IT infrastructure/ Systems
Experience in:
- Large environments (500+ users)
- Hybrid cloud setups
- 24/7 support operations
Key Competencies
- Strong troubleshooting & analytical skills
- Ability to handle critical incidents under pressure
- Cross-domain knowledge (Infra + Cloud + Network + Security)
- Excellent communication & stakeholder management
Work Environment
- 24/7 support (shift/on-call rotation)
- Exposure to enterprise clients (US/Global)
- Participation in CAB / change governance
