Senior Mainframe Performance Engineer — GA Local Contract

ApTask; Alpharetta (GA); On-site; USD 110,000 - 170,000; Full time

Job summary

ApTask is seeking a seasoned Mainframe Engineer to manage real-time performance and capacity for critical workloads on z/OS. The role emphasizes anomaly detection, tuning, and data-driven decision support across DevOps and operations teams.

The candidate will collaborate with infrastructure, application, and business teams, participate in on-call rotations, and help migrate tooling to Git/DevOps pipelines. Local GA candidates preferred.

Qualifications

• Bachelor’s degree required or equivalent in a quantitative field.
• 10 years of mainframe systems experience in large z/OS environments.
• Proven performance monitoring, observability and data analysis experience.

Responsibilities

• Monitor real-time z/OS health and performance across workloads using RMF/SmartIS/MICS.
• Detect, troubleshoot and resolve resource anomalies and degradation risks in production.
• Propose performance tuning and workload placement strategies.
• Forecast capacity and model resource demand for planning.
• Develop dashboards and reports for leadership and stakeholders.

Skills

Analytical skills

Problem solving

Communication

Team collaboration

Education

Bachelor’s degree in information systems / mathematics / finance

Tools

RMF

SmartIS

MICS

JCL

DB2

REXX

Python

MS Excel

PowerPoint

SMF

Job description

ApTask is seeking a seasoned Mainframe Engineer to manage real-time performance and capacity for critical workloads on z/OS. The role emphasizes anomaly detection, tuning, and data-driven decision support across DevOps and operations teams.

The candidate will collaborate with infrastructure, application, and business teams, participate in on-call rotations, and help migrate tooling to Git/DevOps pipelines. Local GA candidates preferred.