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Remote Mainframe Developer Jobs in Saint Louis, MO

BAI

Software Engineer

Saint Louis, MO · On-site +1

$75K - $95K/yr

Background in DevOps practices and CI/CD pipeline implementation. * Experience in Agile/Scrum ... off, hybrid and remote working models, tuition assistance and the ability to work in a ...

MasterCard

Software Engineer II

O Fallon, MO · On-site +1

Title and Summary Software Engineer II Who is Mastercard Mastercard is a global technology company ... driven/ remote procedure call frameworks such as: gRPC, Apache Kafka, IBM MQ or other related ...

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$9

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$70

How much do remote mainframe developer jobs pay per hour?

As of Sep 9, 2026, the average hourly pay for remote mainframe developer in Saint Louis, MO is $51.90, according to ZipRecruiter salary data. Most workers in this role earn between $45.82 and $58.89 per hour, depending on experience, location, and employer.

What is a remote mainframe developer?

A Remote Mainframe Developer is a software professional who specializes in designing, developing, maintaining, and troubleshooting applications that run on mainframe computers, while working from a remote location. Mainframes are powerful computers often used by large organizations for critical applications, such as transaction processing and bulk data handling. Remote Mainframe Developers use programming languages like COBOL, JCL, and Assembler, and often connect to mainframe systems via secure networks. Their work ensures that legacy systems remain efficient, secure, and up-to-date. This role typically requires strong technical skills, experience with mainframe environments, and effective communication for collaborating with on-site teams.

What does a remote mainframe developer do?

As a remote mainframe developer, you work from home to design, code, test, and configure software and applications used on a mainframe system. Mainframes are large computers with particularly high processing power and are often used for critical tasks like bulk data processing or enterprise resource planning. In this role, you may help ensure all new software is fully backward-compatible, monitor system performance, isolate errors, and work collaboratively with other developers as needed. Most mainframe developers work for larger companies. As a remote employee, you use virtual office software, phone, chat, or email to remain connected to other employees.

What are the key skills and qualifications needed to thrive as a remote mainframe developer, and why are they important?

To thrive as a Remote Mainframe Developer, you need strong programming skills in languages like COBOL, JCL, and experience with mainframe operating systems, often supported by a degree in computer science or related field. Familiarity with tools such as IBM z/OS, DB2, CICS, and version control systems is typically required, along with relevant certifications. Excellent problem-solving abilities, independent work ethic, and effective virtual communication are standout soft skills for this remote role. These skills ensure smooth maintenance, modernization, and support of critical legacy systems in distributed teams.

How does a remote mainframe developer typically collaborate with on-site teams and manage communication challenges?

As a Remote Mainframe Developer, you'll often work closely with on-site IT teams, business analysts, and project managers through virtual meetings, chat platforms, and shared documentation tools. Effective communication is key, so regular check-ins and proactive status updates help ensure alignment on project goals and troubleshooting efforts. Many companies use agile methodologies, which means you'll likely participate in daily stand-ups and sprint planning sessions remotely. While time zone differences can be a challenge, flexible scheduling and clear communication protocols are common strategies to keep everyone connected and productive.

Are remote mainframe developer jobs in demand?

Remote mainframe developer jobs are in steady demand due to ongoing reliance on legacy systems in industries like finance and government. Skills in COBOL, JCL, and mainframe environments remain valuable, and remote work options are increasingly available for experienced professionals. However, the overall demand is influenced by industry adoption of modern technologies and digital transformation efforts.
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Remote Mainframe Developer jobs near you
Infographic showing various Remote Mainframe Developer job openings in Saint Louis, MO as of September 2026, with employment types broken down into 100% Full Time. Highlights an 100% Remote job distribution, with an average salary of $107,943 per year, or $51.9 per hour.

Mainframe Developer

Saint Louis, MO • Remote

Stellar IT Solutions LLC
IT Services • 51 - 200 employees
Learn more about Stellar IT Solutions LLCexternal

$50 - $60/hr

Contractor

Posted 26 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 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.