Mainframe Developer

Job overview

The Mainframe Developer role is fully remote and listed from San Francisco, CA, with compensation stated as $100–$150 per year. YO AI Labs seeks experienced COBOL and mainframe specialists for a customer project focused on training and improving AI systems. The developer analyzes legacy code and business logic, documents system processes, and evaluates technical content. The role contributes domain expertise and test scenarios to AI training datasets while supporting accurate, complete technical materials.

What you'll do

• Analyze COBOL codebases, workflows, and business logic
• document programs, processes, and requirements
• review code, pseudocode, and scenarios
• identify edge cases and defects
• annotate technical content for AI training datasets
• design and review test cases
• advise on legacy architecture, integrations, and dependencies
• collaborate with project coordinators and technical experts
• support modernization or migration projects where applicable.

What we're looking for

Skills & competencies

mainframe developer

remote

yo ai labs

contract

cobol

legacy systems

jcl

db2

cics

vsam

ai training datasets

technical documentation

Work arrangement

• Weekend coverage required

Benefits & perks

• Not specified.

Why this role

The posting describes the role as contractor and requires professional COBOL development or mainframe experience, strong COBOL proficiency, and experience with mainframe systems. JCL, DB2, CICS, and VSAM are preferred.

About the employer

YO AI Labs is hiring for this role. Industry: Custom Computer Programming Services. Sector: 54.