About this opportunity
Oorwin AI lists this Mainframe Developer opportunity in workfromhome, Missouri. Review the employer’s description below for duties, qualifications and application requirements.
Job description
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.
Document remediation steps, secure design patterns, and operational improvements.
Contribute to strengthening long‑term resilience of legacy banking systems.
Required Skills
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.
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Worksite address
workfromhome, MO, 63146, US
Who can apply
Review the original listing for work authorization, qualifications and employer requirements.