Mainframe Developer
US$115,000 – US$145,000 / yr base salary
Posted 12 Oct 2026
Advertised as “Senior Mainframe Developer”
BranchFactor Summary
The original posting with the fluff stripped out
- Expected experience
- 10+ yrs
- Management level
- People management
- Contract
- Full-time
| Base salary | US$115,000 – US$145,000 / yr |
|---|
Field of studyComputer Science, Engineering, Information Systems (or related)
Study levelBachelor's
About This Opportunity
We are seeking an experienced Senior Mainframe Developer to lead the remediation and modernization of a 50-year-old legacy COBOL system running on a Unisys mainframe platform. 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:
- Legacy System Assessment & Remediation
- Analyze and document existing Unisys-based COBOL applications, batch processes, databases, interfaces, and data flows.
- Review and assess approximately 50 years of application code for technical debt, dependencies, and remediation requirements.
- Identify and resolve code defects, performance bottlenecks, and system integration constraints.
- Refactor, modify, and enhance COBOL programs to support modern integration patterns.
- Maintain business continuity while implementing system changes.
- Workday Integration Enablement
- Design and implement integration solutions between legacy Unisys applications and Workday.
- Create outbound interfaces for legacy data to Workday.
- Develop inbound processes to consume Workday-generated data.
- Support Workday APIs, web services, EIBs, and middleware-based integrations.
- Design data transformation and validation processes to ensure data integrity.
- Data Analysis & Conversion
- Analyze existing master and transactional data structures.
- Map legacy data elements to Workday objects.
- Identify data quality issues and develop remediation plans.
- Support migration and reconciliation activities.
- Develop automated processes for data extraction and transformation.
- Architecture & Modernization
- Provide recommendations for modernization and technical roadmaps.
- Identify opportunities to reduce technical debt and improve maintainability.
- Implement best practices for application lifecycle management.