Mainframe Developer

Overview:

Position: Mainframe Developer (Senior - Security Remediation)

Location: Remote

Duration: 6-12+ Months Contract

Role Overview

We are seeking experienced Senior Mainframe Engineers with deep expertise in legacy banking systems to investigate, understand, and safely remediate security vulnerabilities in production-critical applications. This role requires strong proficiency in COBOL, CICS, DB2, and z/OS, along with the ability to navigate complex, decades-old financial systems where stability and accuracy are paramount. The ideal candidate will be a hands-on engineer who can trace vulnerabilities to their root cause, implement secure fixes, and ensure safe deployment without disrupting mission-critical banking operations.

Key Responsibilities

• Investigate and analyze security vulnerabilities within legacy mainframe banking applications.
• Trace issues to their technical root cause and design secure remediation strategies.
• Modify and enhance COBOL, CICS, and DB2 codebases while ensuring production stability.
• Collaborate with security, infrastructure, and application teams to validate fixes.
• Conduct secure coding reviews and enforce mainframe security best practices.
• Provide production support for remediation deployments, ensuring minimal disruption.
• Document remediation steps, secure design patterns, and operational improvements.
• Contribute to strengthening long-term resilience of legacy banking systems.

Required Skills

• Strong expertise in COBOL, JCL, CICS, DB2, z/OS .
• Deep understanding of mainframe application architecture and legacy banking systems.
• Hands-on experience with secure coding practices in mainframe environments.
• Proven ability to remediate vulnerabilities in production-critical systems.
• Strong problem-solving skills and ability to work independently in high-stakes environments.

Preferred Skills

• Experience with large-scale financial or banking applications.
• Familiarity with mainframe modernization initiatives.
• Exposure to secure SDLC practices and vulnerability management frameworks.
• Strong communication skills to bridge security and engineering teams.

Skills:

Mainframe,cobol,aws