Senior Applications Support Specialist

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. 

Role Summary

The L3 ARO Engineer ensures end-to-end reliability, resilience, and performance of critical applications. This role acts as the final technical escalation point, leads major incidents, performs deep diagnostics (especially for Java and .Net based systems), drives permanent fixes, and influences architecture, automation, and operational standards. The engineer mentors L1/L2 teams and partners closely with Development, Architecture, Platform, and Security.

Key Responsibilities

Incident & Problem Management

• Lead major incident (MI) bridges and restore service with minimum business impact.
• Handle all L3 escalations, perform deep diagnostics across Java, JVM, middleware, OS, and infra.
• Own technical RCAs, drive long‑term and systemic remediation.
• Identify recurring failure patterns and risks.

Reliability Engineering

• Apply SRE principles: SLIs/SLOs, error budgets, resilience patterns.
• Tune JVM parameters, analyze thread/heap dumps, and improve performance.
• Influence application architecture for fault tolerance, scalability, and recoverability.
• Validate DR readiness, failover behavior, and resilience testing outcomes.

Change, Release & Risk

• Provide technical approval and risk assessment for high-risk changes.
• Enforce operational readiness for new apps and major releases.
• Ensure changes meet audit, compliance, and regulatory expectations.

 

Automation, Monitoring & Observability

• Build advanced automation using Shell/Python/PowerShell.
• Develop frameworks for health validation, automated recovery, and compliance checks.
• Define observability standards; optimize alerts and improve MTTR.

Leadership & Mentorship