Senior System Engineer

About Us (Ensono)

Ensono is an expert technology adviser and managed service provider. As a relentless ally, we accelerate clients' digital transformation to achieve business outcomes that stand to last. Our dedicated team helps organizations optimize today's systems across any hybrid environment with services such as consulting, mainframe and application modernization, public cloud migration and cloud-native development. With certified experts in AWS, Azure and Google Cloud and recognized as Microsoft Datacenter Transformation Partner of the Year, Ensono has over 3500+ associates globally and is headquartered in greater Chicago.

We care about your success, offering comprehensive strategic and managed services for mission-critical applications. Our Advisory and Consulting services can help upfront with an application strategy or find the right places for your applications - whether it's public, multi or hybrid cloud, or mainframe. And because we span across all mission-critical platforms, we can meet you wherever you are in your digital transformation journey, with 24/7 support when you need it. We are your relentless ally, flexing with you when challenges emerge so you don't feel stuck in place. With cross-platform certifications and decades of experience, our technology experts have become an extension of your team so you're continuously innovating - doing more with less while remaining secure. And that's just the beginning

Job Summary

The AIX L3 System Administrator is responsible for expert‑level administration, engineering, and support of IBM AIX and pSeries environments. This role acts as the highest technical escalation point, owning complex troubleshooting, performance tuning, migrations, virtualization, and lifecycle management while ensuring system stability, security, and availability in mission‑critical environments.

Key Responsibilities

AIX & pSeries Administration

• Install, configure, administer, and maintain IBM AIX servers in enterprise environments
• Perform AIX OS administration, kernel management, and LVM management
• Manage user administration, security policies, password, and identity management
• Administer system services such as NIS, NFS, Samba, and printer services

• Strong expertise in PowerVM / VIOS, HMC, and AIX virtualization
• Build and administer VIOS servers
• Manage HMC administration and upgrades (Version 9 & 10)
• Deep knowledge of Power8, Power9, and Power10/11 pSeries architectures
• Expert understanding of:

• DLPAR
• LPM (Live Partition Mobility)
• Virtual networking
• Virtual storage
• SR‑IOV, vNIC adapters

• Perform AIX server build and configuration using best practices
• Manage NIM (Network Installation Manager) for OS deployment and maintenance
• Execute OS patching, upgrades, and VIOS upgrades

• Lead and execute AIX OS migrations: 6.1, 7.1, 7.2, 7.3.

• Analyze resource utilization and system performance
• Perform performance tuning and capacity planning
• Strong experience in storage management, SAN environments, and HA concepts
• Design and support Fault Tolerant systems, Business Continuity, and Disaster Recovery planning

• Act as final escalation point for complex AIX and hardware‑related issues
• Strong in hardware and OS‑level troubleshooting
• Lead Major Incident troubleshooting and RCA
• Perform trend analysis, identify recurring issues, and drive corrective actions
• Coordinate with hardware vendors for issue resolution
• Plan, schedule, and execute changes; coordinate with cross‑functional stakeholders
• Prepare weekly and monthly operational status reports
• Adhere to ITIL processes, quality, and security standards

• Develop Shell / Perl scripts to automate day‑to‑day administration tasks
• Maintain and update technical documentation, SOPs, and knowledge base
• Support continuous knowledge acquisition and documentation updates

• Provide technical SME support across projects and operations
• Work closely with application, database, storage, network, and cloud teams
• Communicate effectively with interdisciplinary technical and non‑technical teams
• Work in rotational shifts and on‑call support models

• 8-12+ years of hands‑on experience in IBM AIX and pSeries administration
• Deep understanding of IBM AIX OS and Power Systems architecture
• Strong experience with PowerVM, VIOS, HMC
• Excellent troubleshooting skills for OS and hardware issues
• Strong scripting skills (Shell, Perl)
• Experience in enterprise production environments

• IBM Certifications in:

• AIX System Administration
• pSeries Hardware
• Performance Tuning
• Network Administration

• Strong analytical and problem‑solving skills
• Ability to diagnose and resolve issues quickly under pressure
• Excellent communication and documentation skills
• Proactive, detail‑oriented, and ownership‑driven mindset
• Team‑oriented approach with mentoring and knowledge‑sharing attitude