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Mainframes Developer Jobs in Missouri (NOW HIRING)

Apolis

Mainframe Developer

Saint Louis, MO · On-site

$47.75 - $61.25/hr

Mainframe Developer Duration: 12+ Months Location: Remote Only W2 We are seeking a Mainframe Developer to develop, enhance, and support mission-critical applications on IBM z/OS. This role includes ...

Samprasoft

Mainframe Systems Engineer

O Fallon, MO · On-site

$45.75 - $59/hr

Mainframe Developer This position is responsible for developing new/enhancements to system functionality, providing system maintenance, setting up and supporting running of batch processes and ...

Georgia IT Inc

Lead Mainframe Developer

O Fallon, MO · On-site

$45.75 - $59/hr

Lead Mainframe Developer Location: O'Fallon, MO OnSite Full Time Permanent & Contract Product: Hogan suite (UMB,CIS,CAMS etc.) Must Have Experience in L2 and L3 Maintenance, Support and Compliances ...

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 ...

Deloitte

Mainframe Developer

Saint Louis, MO · Hybrid

$47.75 - $61.25/hr

As an experienced Mainframe Developer ,you will have the ability to share new ideas and collaborate on projects as a consultant without the extensive demands of travel. The Project Delivery Talent ...

TEKsystems

Mainframe Developer

Saint Louis, MO · On-site

$50 - $58/hr

Our customer is seeking highly motivated and experienced Mainframe Developers to join our dynamic teams. These roles are critical in addressing technical debt, enhancing existing systems, and ...

TEKsystems

Mainframe Developer

Saint Louis, MO · On-site

$50 - $58/hr

Our customer is seeking highly motivated and experienced Mainframe Developers to join our dynamic teams. These roles are critical in addressing technical debt, enhancing existing systems, and ...

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 ...

Georgia IT Inc

Lead Mainframe

O Fallon, MO · On-site

$45.75 - $59/hr

Lead Mainframe Location: O'Fallon, MO OnSite Full Time Permanent & Contract Product: Hogan suite ... DEVOPS tools. 5. Ability to prioritise and work on multiple tasks/incidents. 6. Possess self ...

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Mainframes Developer information

What does a mainframe developer do?

A mainframe developer designs, codes, tests, and maintains applications running on mainframe computers, often using languages like COBOL, PL/I, or Assembler. They work in environments that require high reliability and security, and may also handle system updates, performance tuning, and integration with other systems.

What is mainframe developer salary?

The salary for a mainframe developer typically ranges from $70,000 to $120,000 annually, depending on experience, location, and certifications. Senior roles or those with specialized skills in COBOL, JCL, or mainframe environments may earn higher compensation. Many positions also offer benefits such as health insurance and retirement plans.

Can mainframe be replaced by AI?

Mainframes are large-scale computing systems used for critical enterprise applications, and while AI can automate certain tasks and improve efficiency, it does not replace the core functions of mainframes. Mainframe developers often work with legacy systems, COBOL programming, and security protocols, which require specialized skills that are not fully replaced by AI technologies.

Is mainframe still in demand?

Mainframes remain in demand for large enterprises such as banks, insurance companies, and government agencies that rely on their reliability, security, and processing power. Mainframe developers with skills in COBOL, JCL, and mainframe environments are sought after to maintain and upgrade legacy systems, though the overall demand has decreased as organizations adopt cloud and distributed computing. Certification and experience with mainframe tools can enhance job prospects in this specialized field.

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
Mainframe Developer

Mainframe Developer

Apolis

Saint Louis, MO • On-site

$47.75 - $61.25/hr

Other

Posted 18 days ago

Job description

Role: Mainframe Developer
Duration: 12+ Months
Location: Remote
Only W2
We are seeking a Mainframe Developer to develop, enhance, and support mission-critical applications on IBM z/OS. This role includes batch and/or online transaction processing, database work (DB2/IMS), testing, and production support.
Roles & Responsibilites
  • Design, develop, and maintain mainframe applications using COBOL (and/or PL/I), JCL, and related technologies.
  • Develop and support batch processing jobs (job streams, scheduling coordination, restarts, abend handling).
  • Build and maintain online applications using CICS and/or IMS TM, including transaction and screen/program changes.
  • Develop and optimize data access using DB2 (SQL) and/or IMS DB; perform basic performance tuning as needed.
  • Conduct impact analysis, estimate effort, and deliver enhancements/defect fixes through the SDLC (Software Development Life Cycle).
  • Perform debugging, root-cause analysis, and resolution of production issues; participate in on-call/support rotations as required.
  • Create and maintain technical documentation (program specs, job flows, runbooks, release notes).
  • Collaborate with cross-functional teams (business, QA, operations, infrastructure) to ensure stable releases and successful deployments.
  • Follow secure coding practices and comply with audit, access control, and data handling requirements.
Skills:
  • Hands-on experience with IBM z/OS mainframe development.
  • Strong proficiency in COBOL (or PL/I)
  • Strong proficiency in JCL and batch job processing concepts
  • Working experience with DB2 (SQL development and data handling) and/or IMS
  • Experience with ISPF/TSO and ability to navigate datasets, job logs, and execution outputs
  • Debugging and troubleshooting skills (including abend analysis)
  • Understanding of SDLC practices, testing, and release/change processes
  • Strong communication and documentation skills

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