Senior Infrastructure Engineer — Managed Services

We at Acxelsus are on a mission to showcase exceptional Filipino talent globally. Beyond educational credentials and professional experience, we highly prioritize passion, dedication, loyalty, and a proactive attitude towards personal growth. Our foundation is built upon a set of core values - R.I.G.H.T. - representing Reliability, Integrity, Goal-Oriented mindset, Happiness, and Teamwork. These values define our identity and guide our approach to achieving success.

If you are passionate about advancing your career, forging genuine connections, and becoming part of a team committed to your success, join us!
Job Overview

The Senior Infrastructure Engineer (L3) is a strong technical resource within the Managed Services organization, responsible for owning and resolving complex infrastructure incidents, providing advanced troubleshooting and escalation support, and ensuring the stability, performance, and availability of customer environments. This role combines hands-on operational ownership with technical leadership, contributing to root cause analysis, infrastructure design, project delivery, documentation, and continuous service improvement.

The role requires strong hands-on experience supporting enterprise infrastructure technologies, including VMware vSphere/ESXi (v7/v8 preferred), Windows Server, Active Directory, DNS, DHCP, Group Policy, Linux administration (RHEL/Ubuntu/CentOS), enterprise storage platforms, backup and disaster recovery solutions, and cloud platforms such as Azure and AWS. Experience with Cisco UCS, PKI, infrastructure lifecycle management, migrations, patching, upgrades, and managed services operations is highly valued.
Key Responsibilities

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Incident Ownership: Own the full lifecycle of complex infrastructure incidents, from detection through resolution and post-incident review, ensuring accountability for technical outcomes, stability, and documentation.

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Critical Incident Leadership: Lead investigation and resolution of critical incidents, driving coordination across internal teams, vendors, and customer stakeholders.

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Technical Decision-Making: Make technical decisions and take end-to-end ownership of infrastructure issues, driving resolution without reliance on further escalation.

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Project Delivery: Lead technical delivery of infrastructure projects, including scoping, estimation, design, and implementation.

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Root Cause Analysis: Perform root cause analysis and develop long-term remediation strategies to prevent recurrence.

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Change Validation: Validate and approve infrastructure changes, designs, and remediation strategies.

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Mentorship : Provide technical guidance and mentorship to junior engineers.

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Documentation: Contribute to architecture documentation, diagrams, and operational runbooks.

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Automation & Process Improvement: Design and implement automation and process improvements to enhance reliability and operational efficiency.

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Change Management : Participate in change management and project planning activities.

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Time Tracking: Accurately track time and project activities within the time tracking system, maintaining a target billable utilization of approximately 70%.

Qualifications

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Education: Bachelor's degree in Information Technology, Computer Science, or a related field, or equivalent work experience.

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Experience: 6–10 years of experience supporting enterprise IT infrastructure, ideally within a Managed Service Provider (MSP) environment supporting multiple client environments simultaneously.

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Virtualization: Deep, hands-on experience with VMware vSphere 7.x/8.x — including ESXi administration, vCenter, vMotion, HA/DRS, distributed virtual switches, VM lifecycle management, and vSphere upgrade planning (compatibility validation, upgrade sequencing, rollback planning).

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Operating Systems: Strong administration experience with Windows Server 2019/2022 (AD DS, Group Policy, DNS/DHCP, IIS, WSUS) and Linux (RHEL/CentOS/Rocky, Ubu