Mainframe Developer – Unisys OS2200

AG Consulting Partners, Inc.

. Analyze, maintain, enhance, and support mission-critical applications running on the Unisys OS2200 platform.

Posted 11/10/2026full-timeRemote • Washington • United StatesMid-LevelSenior💰 $115,000 - $145,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in developing and supporting mission-critical applications on the Unisys OS2200 platform, with strong capabilities in COBOL ANSI 74, ECL, and DMS. Proficient in application testing, technical documentation, and collaboration with cross-functional teams to deliver high-quality solutions.

Highest-signal resume keywords

Unisys OS2200 ExperienceCOBOL ANSI 74 DevelopmentECL Job Stream DesignApplication Testing and Quality AssuranceTechnical Documentation Creation

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

COBOL ANSI 74ECL (Executive Control Language)DMS (Data Management System)TIP (Transaction Interface Package)Application TestingDefect AnalysisQuality AssuranceApplication ModernizationLegacy Application SupportSystem Integration

Soft Skills

Analytical SkillsTroubleshooting SkillsVerbal CommunicationWritten CommunicationCollaboration

Tools & Technologies

Workday HCMPayroll SystemsFinance SystemsEnterprise ServicesSSG

Industry Keywords

Mainframe EnvironmentGovernment SectorPublic SectorFinancial ServicesInsuranceSDLCChange ManagementRelease ManagementAgile MethodologiesScrum

Tech Stack

Tools & technologies

SDLC

About the role

Key responsibilities & impact

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 job streams and batch processing solutions.
Support and maintain applications utilizing DMS databases.
Develop and maintain TIP 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.
Support integration with Workday HCM, Payroll, Finance, and related enterprise services.
Enable reliable and secure data exchange between legacy applications and the Workday platform.

Requirements

What you’ll need

Bachelor's degree in Computer Science, Information Systems, Engineering, or a related field.
Equivalent combination of education and relevant experience may be considered.
5+ years of experience developing and supporting enterprise applications in a mainframe environment.
Experience with Unisys OS2200.
Experience with COBOL ANSI 74.
Experience with ECL (Executive Control Language).
Experience with SSG.
Experience with DMS (Data Management System).
Experience with 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.
Excellent verbal and written communication skills.
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.
Eligible to work in the United States.
Preferred: experience with application modernization, remediation, or migration initiatives involving legacy mainframe platforms.
Preferred: experience supporting large government, public sector, financial services, insurance, or enterprise environments.
Preferred: knowledge of SDLC, change management, and release management practices.
Preferred: experience participating in system integration, data conversion, or platform transformation projects.
Preferred: familiarity with Agile, Scrum, or hybrid project delivery methodologies.
Experience mentoring junior and mid-level developers.
Understanding of payroll, HR, finance, and workforce management business processes.
Experience communicating with executives, architects, business stakeholders, and technical teams.

Benefits

Comp & perks

Medical insurance
Dental insurance
Vision insurance
PTO
401K matching
Education reimbursement
Community and philanthropic events
Flexible career paths