Senior Mainframe Developer — Unisys OS2200 & Workday

AG Consulting Partners, Inc.; Tacoma (WA); On-site; USD 120,000 - 160,000; Full time

Job summary

AG Consulting Partners, Inc. in Redmond, WA seeks an experienced Mainframe Developer to maintain and modernize critical enterprise apps on Unisys OS2200 and to enable secure data exchange with Workday HCM, Payroll, and Finance.

The role focuses on COBOL ANSI 74, ECL, SSG, DMS, and TIP, with collaboration across architects, analysts, and infrastructure teams. Strong documentation, testing, and cross-functional communication are essential.

Qualifications

• Bachelor's degree in Computer Science, Information Systems, Engineering, or a related field.
• 5+ years of experience developing and supporting enterprise applications in a mainframe environment.
• Demonstrated experience with Unisys OS2200, COBOL ANSI 74, ECL, SSG, DMS, TIP.
• Strong experience performing application testing, defect analysis, and quality assurance activities.
• Experience supporting large-scale legacy application environments and mission-critical business systems.
• Strong analytical and troubleshooting skills with the ability to resolve complex technical issues.
• Excellent verbal and written communication skills.
• Proven ability to create clear and comprehensive technical documentation, system procedures, and operational support guides.
• Experience working in cross-functional project teams and collaborating with technical and business stakeholders.

Responsibilities

• Analyze, maintain, enhance, and support mission-critical applications on the Unisys OS2200 platform.
• Develop, modify, troubleshoot, and optimize applications written in COBOL ANSI 74.
• Design, develop, and maintain ECL (Executive Control Language) job streams and batch processing solutions.
• Support and maintain applications utilizing DMS (Data Management System) databases.
• Develop and maintain TIP (Transaction Interface Package) online transaction processing applications.
• Collaborate with SSG and related system utilities to support application and system functionality.
• Perform application analysis, impact assessments, and root-cause investigations for production issues.
• Develop and execute unit, integration, system, and user acceptance testing activities.
• Create and maintain technical specifications, system documentation, operational procedures, and support materials.
• Participate in application remediation, modernization, migration, and upgrade initiatives.
• Collaborate with business analysts, project managers, architects, infrastructure teams, and end users to deliver high-quality solutions.
• Support production deployments, release management activities, and post-implementation validation.

Skills

Technical Leadership

Business Analysis

Strong Communication

Cross-functional Collaboration

Education

Bachelor's degree in Computer Science / Information Systems / Engineering or related field

Tools

Unisys OS2200

COBOL ANSI 74

ECL (Executive Control Language)

SSG

DMS (Data Management System)

TIP (Transaction Interface Package)

Workday Integration

Job description

AG Consulting Partners, Inc. in Redmond, WA seeks an experienced Mainframe Developer to maintain and modernize critical enterprise apps on Unisys OS2200 and to enable secure data exchange with Workday HCM, Payroll, and Finance.

The role focuses on COBOL ANSI 74, ECL, SSG, DMS, and TIP, with collaboration across architects, analysts, and infrastructure teams. Strong documentation, testing, and cross-functional communication are essential.