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

* Mentor L1/L2 teams; review and approve runbooks, SOPs, and KB articles.
* Act as a trusted technical advisor to stakeholders and leadership.

Skills & Qualifications

Technical (Mandatory)

* Strong knowledge of application architecture, distributed systems, and
middleware.
* Java expertise: JVM internals, GC, memory management, thread/heap dump
analysis, performance tuning.
* .Net -- CLR internals, garbage collection, memory management, thread/dump
analysis, and application performance tuning.
* Strong Unix/Linux, networking basics, and advanced scripting
(Shell/Python/PowerShell/VBS).
* Advanced SQL and understanding of databases; Autosys (or equivalent
scheduler).
* Handson with observability tools: Splunk, AppDynamics/Dynatrace, ELK,
Grafana, Prometheus.

Reliability & Operations

* Major incident leadership, deep RCA, change/release readiness, DR &
resilience engineering.
* Experience in regulated production environments.

Soft Skills

* Strong technical leadership and decision‑making.
* Clear communication during high‑pressure incidents.
* Ownership mindset and business awareness.

Experience & Education

* 7–12+ years in Application Reliability, Production Support, SRE, or platform
operations.
* Bachelor’s degree in Computer Science/Engineering or equivalent.
* ITIL, cloud, or industry certifications (preferred).
* Banking/financial domain experience (preferred).

Working Conditions

* On‑call and after‑hours support as required.
* Fast‑paced environment with multiple priorities.
* Hybrid working model

 "We are an equal opportunity employer. All qualified applicants will be
considered for employment without regard to caste, color, creed, religion,
gender, gender identity, sexual orientation, age, disability, HIV status, or any
other status protected by law. Candidates with disabilities who require
accommodation during the recruitment process are encouraged to contact our
Talent Acquisition team to place a request."