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Mainframe Developer With Cobol Jobs in Colorado (NOW HIRING)

US Bank

z/OS Systems Engineer

Denver, CO · 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 ...

Accenture

Enterprise Technology Architect

Denver, CO · On-site

$94K - $266K/yr

... Software Engineering, Agentic AI, DevSecOps, Cloud platforms, Integration platforms, enterprise ... Cobol and mainframe. You are interested in solving some of the hardest problems in enterprise ...

Stem Xpert

LAN Engineer

Golden, CO · On-site

SAN engineer Requirement: Golden, CO Duration: 12 months Face to Face Interview Required. Local ... with the other service towers such as server support, mainframe, circuit vendors, desktop and ...

US Bank

Principal Network Engineer z/OS

Denver, CO · On-site

Participate in the design and management of IP addressing, network architecture, and mainframe integration with enterprise infrastructure. * Support software implementation, maintenance, and upgrades ...

krg technology inc

Test Engineer

Denver, CO · On-site

Company Description Sevagan M sevagan at krgtech com ph-661-367-8000 Extn-513 Manual Testing of Web Service using REST / SOAP Telecom domain with TIBCO, SQL, Mainframe JavaScript / Java / Python - to ...

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Mainframe Developer With Cobol information

What is a mainframe developer with COBOL?

Mainframe Developers with COBOL are IT professionals who specialize in developing, maintaining, and supporting applications that run on mainframe computers using the COBOL programming language. They work with legacy systems, often in industries like banking, insurance, or government, where mainframes are still prevalent due to their reliability and processing power. Their responsibilities include coding, debugging, testing, and optimizing COBOL programs, as well as integrating mainframe applications with newer technologies. Mainframe Developers also ensure the performance and security of mission-critical systems that handle large volumes of data.

What are the key skills and qualifications needed to thrive as a mainframe developer with COBOL?

To thrive as a Mainframe Developer with COBOL, you need expertise in COBOL programming, mainframe systems (such as IBM z/OS), JCL, and database management, typically supported by a degree in computer science or a related field. Familiarity with tools like TSO/ISPF, DB2, CICS, and source control systems is commonly required, and certifications in mainframe technologies can be advantageous. Strong problem-solving, attention to detail, and effective communication skills help you manage complex legacy systems and collaborate with cross-functional teams. These skills and qualifications are vital for maintaining, enhancing, and supporting critical business applications that rely on mainframe environments.

What are some common challenges faced by mainframe developers working with COBOL, and how can they be overcome?

Mainframe Developers working with COBOL often encounter challenges such as maintaining legacy code, integrating mainframe systems with modern technologies, and adapting to evolving business requirements. Legacy systems may lack proper documentation, making it crucial to develop strong debugging and reverse-engineering skills. Collaborating closely with business analysts and other IT teams helps ensure a clear understanding of requirements and smoother integration projects. Staying up-to-date with mainframe modernization tools and participating in knowledge-sharing sessions within your team can also help overcome these challenges and support career growth.

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Mainframe Developer With Cobol jobs near you
Infographic showing various Mainframe Developer With Cobol job openings in Colorado as of June 2026, with employment types broken down into 12% As Needed, 56% Full Time, 12% Part Time, 8% Temporary, 8% Contract, and 4% Nights. Highlights an 85% Physical, 5% Hybrid, and 10% Remote job distribution.

SME Software Developer, Applications

Essnova Solutions, Inc.

Littleton, CO • On-site

Full-time

Re-posted 19 hours ago

Job description

Essnova Solutions, Inc., an Inc. 500 federal contractor and SBA 8(a)/HUBZone-certified small business, is seeking a highly competent Capture Manager with the strategic acumen and execution horsepower to drive high-value wins across our federal portfolio. With access to powerful contract vehicles including GSA OASIS+, Seaport NxG, FAA eFAST, GSA MAS, and 8(a) STARS III and deep capabilities in IT, Cybersecurity, Healthcare, Geospatial, and Environmental services, we are uniquely positioned for explosive growth. Essnova possesses necessary clearances and ISO, and CMMI Level 3 certification and exceptional past performance.

*This role is contingent upon contract award.

The SME Software Developer serves as a subject matter expert in the design, development, and modernization of HRD’s enterprise applications. This role provides technical leadership, advanced coding expertise, and oversight of complex migrations and integrations across mainframe and web-based environments. 

  • Lead development of large-scale applications in Natural, SQL, Java, and JavaScript. 
  • Design and implement solutions for modernizing legacy systems. 
  • Provide technical guidance and mentorship to senior and journeyman developers. 
  • Ensure secure, scalable, and efficient code across platforms. 
  • Support system conversion, integration, and interoperability verification. 
  • Collaborate with government stakeholders on architecture and system requirements. 

Requirements

  • 10+ years of software development experience. 
  • Ability to obtain and maintain a Federal government background investigation (NACI). 

Desired Qualifications

    • Deep expertise in Natural/ADABAS, IBM z/OS, Oracle, and Postgres SQL. 
    • Experience with system conversion, cloud migration, and web-based technologies. 
    • Knowledge of Agile/SAFe and DevSecOps methodologies. 
    • Recognized certifications in software architecture or enterprise development.