Mainframe programmer Jobs in Denton, TX

We are looking for experienced **COBOL developers** who can read, understand, debug, and write production-quality COBOL code. You will work on tasks that help train and evaluate AI models on legacy software engineering workflows, especially mainframe-style codebases. ### Responsibilities - Read and interpret COBOL programs, copybooks, JCL, and related mainframe code. - Write clean, correct COBOL code based on technical requirements. - Debug COBOL logic and identify issues in existing programs. - Explain code behavior, business logic, and data flow clearly. - Review AI-generated COBOL solutions for correctness, completeness, and style. - Create or evaluate test cases for COBOL programs. - Provide high-quality feedback to improve AI model performance on legacy code tasks. ### Requirements - Strong hands-on experience with COBOL development. - Ability to read and write COBOL code independently. - Familiarity with mainframe environments such as IBM z/OS is preferred. - Experience with JCL, VSAM, DB2, CICS, or copybooks is a plus. - Strong debugging and code review skills. - Clear written communication in English. - Prior experience in banking, insurance, government, or enterprise legacy systems is a plus. ### Ideal Candidate - Has worked on real-world COBOL systems, not just academic examples. - Can explain legacy code clearly to both technical and non-technical audiences. - Is comfortable evaluating code quality and reasoning through edge cases. - Has experience maintaining or modernising large legacy codebases. ### Why Join - Contribute to cutting-edge AI systems focused on software engineering. - Help models better understand and support legacy enterprise code. - Work on intellectually engaging code evaluation and generation tasks. - Flexible opportunity for experienced COBOL engineers.