COBOL Mainframe Developer

COBOL Mainframe Developer

Full-Time 50000 - 70000 Β£ / year (est.) No working from home possible
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At a Glance

  • Tasks: Read, debug, and write COBOL code while evaluating AI models on legacy systems.
  • Company: Join a forward-thinking team focused on AI and legacy software engineering.
  • Benefits: Flexible remote work and opportunities to enhance your skills in a dynamic environment.
  • Other info: Ideal for those passionate about modernising legacy systems and working with cutting-edge technology.
  • Why this job: Make a real impact by improving AI understanding of legacy codebases.
  • Qualifications: Strong COBOL experience and ability to communicate technical concepts clearly.

The predicted salary is between 50000 - 70000 Β£ per year.

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.

We consider all qualified applicants without regard to legally protected characteristics and provide reasonable accommodations upon request.

COBOL Mainframe Developer employer: YO HR Consultancy

Join a forward-thinking company that values innovation and expertise in COBOL development, offering a flexible remote work environment. Our culture fosters collaboration and continuous learning, providing ample opportunities for professional growth while contributing to groundbreaking AI projects that enhance legacy software engineering. With a commitment to inclusivity and support, we ensure that every team member can thrive and make a meaningful impact.

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Contact Details:

YO HR Consultancy Recruitment Team

We think you need these skills to ace COBOL Mainframe Developer

COBOL Development
Debugging Skills
Code Review Skills
JCL
VSAM
DB2
CICS