Lead OS / Infrastructure Administrator

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Elfonze Technologies

WebsiteLinkedInAll Job Openings

201 - 500 employees

Founded 2020

🏢 Enterprise

☁️ SaaS

🤝 B2B

Enterprise • SaaS • B2B

Elfonze Technologies is a technology services and solutions company that builds and manages enterprise IT systems, specializing in Oracle ERP, supply chain and logistics platforms, and cloud-native infrastructure (IaaS/PaaS). The company provides digital transformation, enterprise applications, master data management, AI-enabled platforms, and niche supply chain planning products and services for B2B customers, along with advisory and build-operate-transfer engagements.

📋 Description

• Plan, schedule, and execute ESXi host upgrades across development, test, and production environments with minimal business disruption. • Apply driver updates, firmware patches, and VMware Tools refreshes in accordance with VMware compatibility matrices. • Conduct thorough post-upgrade host validation including vSphere cluster health checks, datastore integrity, and network connectivity verification. • Maintain upgrade documentation, change records, and rollback procedures for all ESXi lifecycle activities. • Monitor ESXi host performance, resource utilisation, and HA/DRS configurations to ensure optimal virtualisation efficiency. • Lead end-to-end migration of virtual machines from VMware vSphere to Microsoft Hyper-V, covering planning, execution, validation, and hypercare. • Perform VM hardware version upgrades and compatibility assessments prior to migration, ensuring alignment with target Hyper-V environment requirements. • Execute VMware Tools removal and replacement with Hyper-V Integration Services as part of the migration workflow. • Develop and maintain detailed migration runbooks covering pre-migration checks, execution steps, rollback procedures, and post-migration validation scripts. • Conduct compatibility validation of applications, network configurations, and storage mappings after migration to Hyper-V. • Design and deliver Hyper-V administration training sessions for internal IT team members, building in-house capability and reducing dependency on external support. • Produce knowledge-transfer documentation covering Hyper-V architecture, VM lifecycle management, checkpoints, and networking configuration. • Plan and execute in-place upgrades and clean installations of Windows Server operating systems (2016 / 2019 / 2022), including pre-upgrade assessment and compatibility review. • Manage patch lifecycle for all Windows Server environments ensuring compliance with security and operational baselines. • Administer Active Directory, DNS, DHCP, Group Policy, and file services in support of enterprise infrastructure. • Coordinate server decommissions, consolidations, and role migrations as part of infrastructure refresh programmes. • Maintain server hardening configurations and contribute to security compliance activities. • Design, implement, and manage enterprise backup strategies covering physical servers, virtual machines, and cloud workloads. • Administer backup solutions (e.g. Veeam, Veritas NetBackup, Azure Backup) ensuring scheduled jobs, retention policies, and offsite replication are operational. • Plan and conduct regular recovery drills, validating RTO and RPO targets across critical systems. • Respond to and manage recovery scenarios including full server restores, file-level recoveries, and VM rollbacks. • Maintain backup inventory, reporting dashboards, and escalation procedures for backup failures. • Lead infrastructure migration projects as the primary technical authority, from scoping and planning through execution and post-migration support. • Develop project plans, risk registers, migration runbooks, and stakeholder communication packs. • Coordinate with application teams, network engineers, security, and business stakeholders to align migration windows and minimise impact. • Chair migration readiness reviews, cutover planning sessions, and post-migration retrospectives. • Maintain hands-on delivery participation throughout all project phases — not limited to oversight only. • Provide infrastructure support and operational oversight for AWS environments including EC2, VPC, S3, IAM, CloudWatch, and related services. • Contribute to hybrid cloud architecture discussions, supporting workload placement decisions across on-premises and AWS. • Apply AWS best practices for security, cost optimisation, and high availability in line with organisational cloud governance. • Support cloud migration assessments and lift-and-shift activities where applicable.

🎯 Requirements

• 10 – 12 Years of hands-on experience in OS administration, virtualisation, and infrastructure projects — with demonstrated lead-level ownership of migration programmes. • Hands-on proficiency in ESXi upgrade procedures, including SUM/VUM-based upgrades, offline bundle upgrades, and driver/firmware update workflows. • Demonstrated experience in VMware to Hyper-V migrations at scale, including hardware version upgrades, compatibility validation, and runbook authorship. • Strong Windows Server administration skills across 2016, 2019, and 2022 — in-place upgrades, role migrations, and security baseline management. • Proven experience designing and managing enterprise backup solutions with validated recovery testing. • Working knowledge of AWS core services: EC2, S3, VPC, IAM, CloudWatch, Route 53, and related infrastructure services. • Experience developing migration runbooks, cutover plans, and post-migration validation checklists. • Ability to design and deliver technical training material for team capability uplift.

🏖️ Benefits

• Remote position