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Mainframes Developer Jobs in Missouri (NOW HIRING)

S2Tech

Mainframe Developer (Remote)

Chesterfield, MO · Remote

$48.50 - $62.25/hr

Mainframe Developer Location: Remote About Us : Known for "Delighting the Client" through performance, innovation, and an employee-centric culture, S2Tech is a fast-growing IT consulting company ...

S2Tech

Mainframe Developer (Remote)

Chesterfield, MO · On-site +1

$48.50 - $62.25/hr

Mainframe Developer Location: Remote About Us : Known for "Delighting the Client" through performance, innovation, and an employee-centric culture, S2Tech is a fast-growing IT consulting company ...

TriOptus LLC

Mainframe CICS Programmer

Belton, MO · On-site

$43.50 - $55.75/hr

* Mainframe CICS Engineer * As a global financial services firm, client is committed to technological innovation. * Client relies on client technologists around the world to create leadingedge, secure ...

Neshent Technologies

Mainframe Support Engineer

Saint Louis, MO · On-site

$47.75 - $61.25/hr

We are seeking a Mainframe Support Engineer to provide L2/L3 production support for enterprise mainframe applications. The ideal candidate will have strong experience with COBOL, DB2, VSAM, Batch ...

New

Neshent Technologies

Mainframe Support Engineer

Saint Louis, MO · On-site

$47.75 - $61.25/hr

We are seeking a Mainframe Support Engineer to provide L2/L3 production support for enterprise mainframe applications. The ideal candidate will have strong experience with COBOL, DB2, VSAM, Batch ...

New

US Bank

z/OS Systems Engineer

Earth City, MO · On-site

Bank is seeking a z/OS Systems Programmer that has extensive experience in mainframe technologies with an emphasis on installation/upgrading, tuning, and troubleshooting of z/OS and third-party ...

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Mainframes Developer information

What does a Mainframes Developer do?

A Mainframes Developer designs, codes, tests, and maintains applications running on mainframe systems, primarily using languages like COBOL, PL/I, or Assembler. They ensure the stability, security, and efficiency of legacy systems, often working with tools such as JCL and DB2, and may collaborate with system administrators and analysts to support business operations.

Is a mainframes developer a good career?

A mainframes developer is a specialized IT professional who maintains and develops applications on mainframe systems, which are used by large organizations for critical data processing. The role offers stable employment, competitive salaries, and opportunities to work with legacy systems and mainframe programming languages like COBOL. However, it requires specific skills and certifications, and the field may have limited growth compared to emerging technologies.

Is a mainframes developer still in demand?

Mainframes developers are still in demand in industries such as finance, government, and healthcare that rely on legacy systems. They typically work with COBOL, JCL, and mainframe environments, and demand persists due to the continued use of mainframe technology for critical applications. However, the number of new positions is gradually decreasing as organizations modernize their IT infrastructure.

What is the difference between Mainframes Developer vs Mainframes Analyst?

AspectMainframes DeveloperMainframes Analyst
Required CredentialsTypically a degree in Computer Science or related field; certifications like IBM Certified SpecialistSimilar credentials; often holds certifications in mainframe systems and analysis
Work EnvironmentDevelops, codes, and tests mainframe applications in a software development settingAnalyzes existing mainframe systems, gathers requirements, and supports system improvements
Employer & Industry UsageUsed by banks, insurance companies, and large enterprises for application developmentEmployed in similar industries for system analysis, troubleshooting, and process optimization

While both roles require knowledge of mainframe systems and similar credentials, Mainframes Developers focus on creating and maintaining mainframe applications, whereas Mainframes Analysts analyze existing systems to improve performance and efficiency. Both roles are vital in large enterprise IT environments.

What are popular job titles related to Mainframes Developer jobs in Missouri? For Mainframes Developer jobs in Missouri, the most frequently searched job titles are:
What job categories do people searching Mainframes Developer jobs in Missouri look for? The top searched job categories for Mainframes Developer jobs in Missouri are:
Mainframes Developer jobs near you
Infographic showing various Mainframes Developer job openings in Missouri as of August 2026, with employment types broken down into 84% Full Time, 2% Part Time, and 14% Contract. Highlights an 80% Physical, 6% Hybrid, and 14% Remote job distribution.

Mainframe Developer (Remote)

S2Tech

Chesterfield, MO • Remote

$48.50 - $62.25/hr

Full-time

Medical, Dental, Vision, Life, Retirement, PTO

Re-posted 6 days ago

Job description

Mainframe Developer

Location: Remote

About Us:

Known for “Delighting the Client” through performance, innovation, and an employee-centric culture, S2Tech is a fast-growing IT consulting company serving clients in over a quarter of the United States. We are widely recognized as a leading provider of both technical and business services in support of Health and Human Services-related projects. Feel free to learn more at www.s2tech.com.

Why S2Tech?:

  • Stable privately-owned company with a strong reputation for building long-term client relationships through the delivery of consistent value-based service
  • 25+ years providing IT and Business services to private customers and government programs throughout the United States
  • Expansive client portfolio and active projects – employees benefit from innovative project exposure and in-house skill development training/courses  
  • Corporate culture that emphasizes the importance of family and promotes a healthy work-life balance
  • Offer competitive pay and a range of benefits, including:
    • Medical / Dental / Vision Insurance – insurance premium assistance provided
    • Additional Insurance (Life, Disability, etc.)
    • Paid Time Off
    • 401(k) Retirement Savings Plan & Health Savings Account
    • Various training courses to promote continuous learning
    • Corporate Wellness Program
  • Be part of a company that gives back through its non-profit organization, Fortune Fund, which was launched in 2001. The goal of the Fortune Fund is to close the rural/urban divide by ensuring children in rural communities in India and the United States understand the importance of education & are aware of professional career opportunities, allowing them to link their professional & educational goals

Job Overview:

We are seeking an experienced COBOL Mainframe Developer to join our dynamic team. The ideal candidate will have a proven track record of success in designing, developing, and maintaining COBOL-based applications on mainframe systems.

Responsibilities:

  • COBOL Development: Design, code, test, and maintain COBOL programs for mainframe applications
  • Mainframe Systems: Work with mainframe systems and associated technologies to ensure optimal performance and reliability
  • Analysis and Troubleshooting: Analyze business requirements and system specifications to develop effective and efficient COBOL solutions. Identify and troubleshoot issues, providing timely resolutions
  • Collaboration: Collaborate with cross-functional teams, including business analysts, systems analysts, and other developers, to ensure seamless integration of COBOL applications within the broader IT ecosystem
  • Documentation: Create and maintain comprehensive documentation for all COBOL programs, ensuring clarity and ease of understanding for other team members
  • Testing: Conduct thorough unit testing of developed code to ensure its functionality, reliability, and compliance with established standards
  • Performance Optimization: Identify opportunities for performance optimization and implement necessary improvements to enhance the overall efficiency of COBOL applications

Qualifications:

  • Bachelor's degree in Computer Science, Information Technology, or a related field
  • Over 5 years of hands-on experience in COBOL development on mainframe systems; a strong preference for prior Medicaid experience
  • Strong knowledge of mainframe technologies and associated tools
  • Experience in working on large-scale projects with complex business logic
  • Excellent analytical and problem-solving skills
  • Strong communication and interpersonal skills
  • Ability to work independently and as part of a collaborative team
  • Detail-oriented with a commitment to producing high-quality code

S2Tech is committed to hiring and retaining a diverse workforce. We are an equal opportunity employer making decisions without regard to age, race, color, religion, sex, sexual orientation, gender identity, national origin, disability, veteran status, or any other protected class.

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