Mainframe Developer - Unisys OS2200

Mainframe Developer (Unisys OS2200)

AG Consulting Partners, Inc. · Tacoma, United States (Remote) · Full-time · Posted 2026-11-09

Salary: USD 115,000–145,000

Workplace: remote

Department: Technology and Analytics

Description

About This Opportunity

We are seeking an experienced Mainframe Developer with deep expertise in Unisys OS2200 environments to support the maintenance, enhancement, testing, documentation, and modernization of critical enterprise applications. The ideal candidate will possess strong technical knowledge of legacy mainframe technologies, demonstrate excellent problem-solving capabilities, and effectively collaborate with business and technical stakeholders throughout the software development lifecycle. This role will be responsible for analyzing, modifying, and enhancing critical business applications to support integration with Workday Human Capital Management (HCM), Payroll, Finance, and related enterprise services.

This individual will work closely with enterprise architects, Workday integration developers, business analysts, infrastructure teams, and business stakeholders to enable reliable and secure data exchange between legacy applications and the Workday platform.

Key Responsibilities:

• Analyze, maintain, enhance, and support mission-critical applications running 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.
• Work 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.

Requirements

You have:

• Education

• Bachelor's degree in Computer Science, Information Systems, Engineering, or a related field.

• Equivalent combination of education and relevant experience may be considered.

• Experience

• 5+ years of experience developing and supporting enterprise applications in a mainframe environment.

• Demonstrated experience with:

• Unisys OS2200

• COBOL ANSI 74
• ECL (Executive Control Language)
• SSG
• DMS (Data Management System)

• TIP (Transaction Interface Package)

• 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.

Preferred Qualifications

• Experience with application modernization, remediation, or migration initiatives involving legacy mainframe platforms.
• Experience supporting large government, public sector, financial services, insurance, or enterprise environments.
• Knowledge of software development lifecycle (SDLC), change management, and release management practices.
• Experience participating in system integration, data conversion, or platform transformation projects.
• Familiarity with Agile, Scrum, or hybrid project delivery methodologies.

This job is for you if you possess:

• Technical Leadership

• Experience mentoring junior and mid-level developers.

• Business Analysis Skills

• Understanding of payroll, HR, finance, and workforce management business processes.

• Strong Communication

• Experience communicating with executives, architects, business stakeholders, and technical teams.

• Legal Authorization

• Eligible to work in the United States.

Benefits

About Us

AG Consulting Partners, Inc. is a Redmond-based boutique consulting firm. Our mission is to embrace the entrepreneurial spirit to relentlessly deliver an exceptional experience and results for our people and our clients.

We put our people first. Our excellent benefits to full-time employees include medical, dental, vision, PTO, 401K matching, education reimbursement, community and philanthropic events and flexible career paths.

We’re humbled to be consistently acknowledged by local and national organizations for our success, including Consulting Magazine, Puget Sound Business Journal, and Inc. 5000.

The compensation for this position is tailored to reflect your unique skill set, relevant experience, and the current dynamics of the job market. We strive to ensure that our compensation package is competitive and fair, taking into account various factors to provide a rewarding opportunity for our team members.

The annual salary range for this role is: $115,000 - $145,000 per year.

Apply

Apply at AG Consulting Partners, Inc.

---

Powered by Workable