Information Technology Infrastructure Specialist - Windows OS

Technology Stack:
Site Infrastructure Management and Operations

Experience:

5 to 10 Years

Employment Type:

Full-Time

Location:

Chennai(On-site)

Industry: Healthcare

Role Overview :

The Site Reliability Engineer / Systems Administrator will be responsible for managing, automating, and optimizing enterprise infrastructure across on-premises and cloud environments. The role blends traditional systems and network administration with Site Reliability Engineering and Dev Ops practices, supporting global customer engagements delivered from India-based IT services and GCC environments.

Key Responsibilities

- Endpoint, Network & Infrastructure Management
- Manage and support Windows desktops, laptops, servers, and mobile/tablet devices
- Administer endpoint security, patching, configuration baselines, and device compliance
- Manage network devices including routers, switches, firewalls, and VPNs
- Operate and maintain wireless infrastructure (WAPs, controllers, authentication)
- Monitor and troubleshoot LAN, WAN, and internet connectivity issues

Identity & Enterprise Authentication Frameworks

- Administer and support hybrid identity environments, including On-Prem Active Directory, Azure AD (Entra ), and Azure AD Connect, ensuring reliable user synchronization and access.
- Manage and troubleshoot authentication and access, including SAML/SSO integrations, identity attributes (UPN, SMTP, Immutable

ID), and sign-in issues across enterprise applications.
- Execute and maintain Power Shell automation for bulk identity, Exchange Online, and Microsoft 365 tenant operations with proper validation, logging, and rollback awareness.
- Administer Microsoft 365 and Exchange Online, including tenant configuration, mail flow, shared mailboxes, aliases, and identity-related email settings.
- Perform and validate DNS configurations (SPF, DKIM, DMARC and related records) and resolve email, authentication, and access issues during migrations and steady-state operations.

Cloud & Platform Operations

- Provision, manage, and optimize cloud infrastructure resources (compute, storage, networking)
- Ensure secure access, identity controls, and least-privilege configurations
- Monitor cloud costs, capacity, and performance trends

Reliability Engineering & Availability

- Define, implement, and continuously improve SLIs, SLOs, and SLAs
- Ensure high availability, fault tolerance, and resilience across systems
- Design and test business continuity and disaster recovery strategies
- Conduct regular failover, backup restore, and resilience testing

Backup, Recovery & Data Protection

- Define and manage backup and recovery policies for endpoints, servers, and cloud workloads
- Ensure backups meet RPO/RTO objectives and compliance requirements
- Periodically validate backup integrity and recovery readiness

Observability & Monitoring

- Implement and enhance logging, monitoring, and alerting across infrastructure and applications
- Reduce alert fatigue through intelligent thresholds and actionable alerts
- Use observability data to drive proactive reliability improvements

Incident & Problem Management

- Define and manage incidents following ITIL/SRE best practices
- Act as incident responder and coordinator during outages and degradations
- Perform root cause analysis (RCA) and document post-incident reviews
- Drive permanent fixes and reliability improvements from incident learnings

Operational Excellence & Documentation

- Create, maintain, and improve operational documentation, runbooks, and SOPs
- Standardize operational procedures to reduce risk and human error
- Support audits, compliance reviews, and internal controls through accurate documentation
- Collaborate with security, engineering, and business teams on operational readiness

Required

Skills & Qualifications

Technical Skills

- Strong hands-on experience with Windows OS administration (desktop & server)
- Strong hands-on expertise in hybrid identity platforms, including On-Prem Active Directory, Azure AD (Entra ), and Azure AD Connect, with a clear understanding of synchronization and identity consistency.
- Proven ability to automate and operate at scale using Power Shell, including bulk identity updates, Microsoft 365 administration, and safe execution of high-impact changes.
- Deep operational knowledge of Microsoft 365 and Exchange Online, including tenant configuration, mail flow, mailboxes, aliases, and identity-related email dependencies.
- Solid understanding of authentication and access protocols, including SAML/SSO, identity attributes (UPN, SMTP, Immutable

ID), and troubleshooting sign-in failures.
- Strong fundamentals in DNS and email authentication, with hands-on experience managing and validating SPF, DKIM, and DMARC to ensure reliable mail delivery and secure access.
- Solid understanding of networking fundamentals (TCP/IP, DNS, DHCP, VLANs, VPNs, firewalls)
- Experience managing endpoint management and security tools
- Practical experience with cloud platforms (IaaS, PaaS fundamentals)
- Knowledge of backup, DR, and business…