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Senior Mainframe Programmer Jobs in Missouri (NOW HIRING)

Stellar IT Solutions

Mainframe Developer

Saint Louis, MO · On-site

$46.50 - $59.75/hr

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 ...

Stellar IT Group

Mainframe Developer

Saint Louis, MO · On-site

$47.75 - $61.25/hr

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 ...

Walmart

Senior, Software Engineer

Anderson, MO · On-site

$90K - $180K/yr

Our Mainframe Team is a high-performing, highly collaborative group responsible for supporting some of the most critical business processes across Walmart's store ecosystem. The team provides ...

Walmart

Senior, Software Engineer

Noel, MO · On-site

$90K - $180K/yr

Our Mainframe Team is a high-performing, highly collaborative group responsible for supporting some of the most critical business processes across Walmart's store ecosystem. The team provides ...

Walmart

Senior, Software Engineer

Cassville, MO · On-site

$90K - $180K/yr

Our Mainframe Team is a high-performing, highly collaborative group responsible for supporting some of the most critical business processes across Walmart's store ecosystem. The team provides ...

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Senior Mainframe Programmer information

What is the difference between Senior Mainframe Programmer vs Mainframe Developer?

AspectSenior Mainframe ProgrammerMainframe Developer
CredentialsTypically requires a mainframe programming certification and several years of experienceOften requires similar certifications and experience, focusing on coding and development
Work EnvironmentWorks primarily on legacy mainframe systems within financial, insurance, or government sectorsDevelops and maintains mainframe applications, often in similar industries
Employer & Industry UsageCommonly employed by large corporations with mainframe infrastructureUsed interchangeably with mainframe programmer, focusing on application development

The main difference between a Senior Mainframe Programmer and a Mainframe Developer is primarily experience level and scope. Senior Mainframe Programmers often have more responsibilities, including overseeing projects and mentoring junior staff, while Mainframe Developers focus on coding and application creation. Both roles require similar credentials and are vital in industries relying on legacy mainframe systems.

What are popular job titles related to Senior Mainframe Programmer jobs in Missouri?

For Senior Mainframe Programmer jobs in Missouri, the most frequently searched job titles are:

What job categories do people searching Senior Mainframe Programmer jobs in Missouri look for?

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Senior Mainframe Programmer jobs near you
Infographic showing various Senior Mainframe Programmer job openings in Missouri as of August 2026, with employment types broken down into 85% Full Time, 6% Part Time, 8% Contract, and 1% Nights. Highlights an 89% Physical, 3% Hybrid, and 8% Remote job distribution.

Mainframe Developer

Stellar IT Solutions

Saint Louis, MO • On-site

$46.50 - $59.75/hr

Other

Posted 13 days ago

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 productioncritical applications. This role requires strong proficiency in COBOL, CICS, DB2, and z/OS, along with the ability to navigate complex, decadesold financial systems where stability and accuracy are paramount. The ideal candidate will be a handson engineer who can trace vulnerabilities to their root cause, implement secure fixes, and ensure safe deployment without disrupting missioncritical 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 longterm 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.

  • Handson experience with secure coding practices in mainframe environments.

  • Proven ability to remediate vulnerabilities in productioncritical systems.

  • Strong problemsolving skills and ability to work independently in highstakes environments.


Preferred Skills

  • Experience with largescale 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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