{"schemaVersion":"jobsearcher.job.v1","id":"4a7de46c41851f9cb452d8a2","url":"https://jobsearcher.com/jobs/4a7de46c41851f9cb452d8a2","canonicalUrl":"https://jobsearcher.com/jobs/4a7de46c41851f9cb452d8a2","title":"Mainframe Developer","description":"Position: Mainframe Developer (Senior - Security Remediation)\n\nLocation: Remote\n\nDuration: 6-12+ Months Contract\n\nRole Overview\n\nWe 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.\n\nKey Responsibilities\n\nInvestigate and analyze security vulnerabilities within legacy mainframe banking applications.\n\nTrace issues to their technical root cause and design secure remediation strategies.\n\nModify and enhance COBOL, CICS, and DB2 codebases while ensuring production stability.\n\nCollaborate with security, infrastructure, and application teams to validate fixes.\n\nConduct secure coding reviews and enforce mainframe security best practices.\n\nProvide production support for remediation deployments, ensuring minimal disruption.\n\nDocument remediation steps, secure design patterns, and operational improvements.\n\nContribute to strengthening long‑term resilience of legacy banking systems.\n\nRequired Skills\n\nStrong expertise in COBOL, JCL, CICS, DB2, z/OS.\n\nDeep understanding of mainframe application architecture and legacy banking systems.\n\nHands‑on experience with secure coding practices in mainframe environments.\n\nProven ability to remediate vulnerabilities in production‑critical systems.\n\nStrong problem‑solving skills and ability to work independently in high‑stakes environments.\n\nPreferred Skills\n\nExperience with large‑scale financial or banking applications.\n\nFamiliarity with mainframe modernization initiatives.\n\nExposure to secure SDLC practices and vulnerability management frameworks.\n\nStrong communication skills to bridge security and engineering teams.","company":"Stellar It Solutions","rawCompany":"stellar it solutions","city":"St Louis","state":"MO","isRemote":false,"isActive":false,"createdAt":"2026-10-06T17:00:31.331Z","occupations":[{"code":"15-1252.00","title":"Software Developers","slug":"software-developers"},{"code":"15-1299.08","title":"Computer Systems Engineers/Architects","slug":"computer-systems-engineers-architects"},{"code":"15-1251.00","title":"Computer Programmers","slug":"computer-programmers"}],"industries":[{"code":"541512","title":"Computer Systems Design Services","slug":"computer-systems-design-services"},{"code":"541511","title":"Custom Computer Programming Services","slug":"custom-computer-programming-services"},{"code":"541519","title":"Other Computer Related Services","slug":"other-computer-related-services"}],"jobPosting":{"@context":"https://schema.org","@type":"JobPosting","title":"Mainframe Developer","description":"Position: Mainframe Developer (Senior - Security Remediation)\n\nLocation: Remote\n\nDuration: 6-12+ Months Contract\n\nRole Overview\n\nWe 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.\n\nKey Responsibilities\n\nInvestigate and analyze security vulnerabilities within legacy mainframe banking applications.\n\nTrace issues to their technical root cause and design secure remediation strategies.\n\nModify and enhance COBOL, CICS, and DB2 codebases while ensuring production stability.\n\nCollaborate with security, infrastructure, and application teams to validate fixes.\n\nConduct secure coding reviews and enforce mainframe security best practices.\n\nProvide production support for remediation deployments, ensuring minimal disruption.\n\nDocument remediation steps, secure design patterns, and operational improvements.\n\nContribute to strengthening long‑term resilience of legacy banking systems.\n\nRequired Skills\n\nStrong expertise in COBOL, JCL, CICS, DB2, z/OS.\n\nDeep understanding of mainframe application architecture and legacy banking systems.\n\nHands‑on experience with secure coding practices in mainframe environments.\n\nProven ability to remediate vulnerabilities in production‑critical systems.\n\nStrong problem‑solving skills and ability to work independently in high‑stakes environments.\n\nPreferred Skills\n\nExperience with large‑scale financial or banking applications.\n\nFamiliarity with mainframe modernization initiatives.\n\nExposure to secure SDLC practices and vulnerability management frameworks.\n\nStrong communication skills to bridge security and engineering teams.","datePosted":"2026-10-06T17:00:31.331Z","dateModified":"2026-10-06T17:00:31.331Z","hiringOrganization":{"@type":"Organization","name":"Stellar It Solutions","sameAs":"https://jobsearcher.com"},"jobLocation":{"@type":"Place","address":{"@type":"PostalAddress","addressLocality":"St Louis","addressRegion":"MO","addressCountry":"US"}},"identifier":{"@type":"PropertyValue","name":"JobSearcher","value":"4a7de46c41851f9cb452d8a2"},"url":"https://jobsearcher.com/jobs/4a7de46c41851f9cb452d8a2"}}