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Mainframe Developer Jobs in Connecticut (NOW HIRING)

InstantServe LLC

Mainframe Systems Programmer

Hartford, CT · On-site

$55.50 - $70.50/hr

... Developer. * Strong hands-on experience with: * COBOL * JCL (Job Control Language) * IMS Database * Mainframe Development and Support * Experience performing data extraction, conversion, migration ...

New

nLeague

Mainframe Systems Programer

Hartford, CT · On-site

$55.50 - $70.50/hr

... Developer Location: Hybrid- 55 Farmington Avenue Hartford, Connecticut Client: CT DSS Duration: 06+ months * Analyse existing mainframe applications, databases, files, and batch processing workflows ...

Genome International Corp

Mainframe

East Hartford, CT

$48.75 - $62.50/hr

Seeking a highly experienced Mainframe Database Migration Specialist to support a critical, time ... Expert-level COBOL programming experience. Strong JCL development and troubleshooting skills.

eSense Incorporated

CT

Seeking a highly experienced Mainframe Database Migration Specialist to support a critical, time ... Expert-level COBOL programming experience * Strong JCL development and troubleshooting skills

Sonsoft Inc

Mainframe Performance Expert

Berlin, CT

$48.50 - $62.50/hr

At least 3 years of experience in Mainframe, RACF & ACF2 Migration Skills * At least 2 years of experience in Development/ Configuration/solutions evaluation/ Validation and deployment * Experience ...

Prophecy Technologies

Mainframe Java Architect

Hartford, CT · On-site

$63.50 - $85.75/hr

Influence platform decisions across cloud, infrastructure, and application engineering. * Ensure modernized systems meet or exceed mainframe performance SLAs. * Drive capacity planning, performance ...

ICONMA

Mainframe IT Project Manager

Hartford, CT

$99K - $117K/yr

Our Staff Members Our in-house team offers a broad range of Information Technology, Engineering ... Mainframe IT Project Manager Location: Hartford, CT Duration: 6 months with possible contract to ...

Deloitte

Automation Engineer

Stamford, CT · Hybrid

Collaborate closely with Java developers, Mainframe engineers, product managers, and project leaders to align automation strategy with business and delivery priorities. * Document automation ...

Deloitte

Automation Engineer

Hartford, CT · Hybrid

Collaborate closely with Java developers, Mainframe engineers, product managers, and project leaders to align automation strategy with business and delivery priorities. * Document automation ...

Deloitte

Senior Automation Engineer

Stamford, CT · Hybrid

$110K - $145K/yr

Collaborate closely with Java developers, Mainframe engineers, product managers, and project leaders to align automation strategy with business and delivery priorities. * Document automation ...

Deloitte

Senior Automation Engineer

Hartford, CT · Hybrid

$104K - $137K/yr

Collaborate closely with Java developers, Mainframe engineers, product managers, and project leaders to align automation strategy with business and delivery priorities. * Document automation ...

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Mainframe Developer information

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How much do mainframe developer jobs pay per hour?

As of Jun 19, 2026, the average hourly pay for mainframe developer in Connecticut is $50.78, according to ZipRecruiter salary data. Most workers in this role earn between $44.81 and $57.64 per hour, depending on experience, location, and employer.

What is the salary of a mainframe developer?

The salary of 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 security may earn higher compensation.

What is the difference between Mainframe Developer vs Mainframe Analyst?

AspectMainframe DeveloperMainframe Analyst
Primary RoleDesigning, coding, and testing mainframe applicationsAnalyzing and maintaining existing mainframe systems
Skills & CertificationsCOBOL, JCL, DB2, certifications like IBM Certified DeveloperCOBOL, JCL, system analysis, troubleshooting skills
Work EnvironmentDevelopment teams, coding in mainframe environmentsSupport teams, system analysis, user support
Industry UsageFinancial services, insurance, government agenciesFinancial institutions, healthcare, government agencies

While Mainframe Developers focus on creating and implementing mainframe applications, Mainframe Analysts primarily analyze, troubleshoot, and maintain existing systems. Both roles require similar technical skills and often work within the same industries, but their core responsibilities differ in development versus support and analysis.

Is mainframe hard to learn?

Mainframe development can be challenging for beginners due to its specialized programming languages like COBOL and its unique environment. However, with dedicated training and practice, many developers can acquire the necessary skills to work effectively on mainframe systems.

What are some common challenges Mainframe Developers face when integrating legacy systems with modern applications?

Mainframe Developers often encounter challenges such as ensuring compatibility between legacy systems and newer technologies, managing data migration without disrupting business operations, and maintaining the security of sensitive data. Effective communication with cross-functional teams, such as application developers and infrastructure engineers, is essential to address these challenges. Staying updated on both mainframe and modern programming practices helps ease integration and ensures long-term system reliability.

Is mainframe still in demand?

Mainframe developers are still in demand due to the continued reliance of many large organizations on mainframe systems for critical operations. Skills in COBOL, JCL, and mainframe security are valuable, and demand persists in industries like finance, insurance, and government. However, the overall number of roles is smaller compared to other modern development environments.

What are Mainframe Developers?

Mainframe Developers are specialized software engineers who design, develop, maintain, and troubleshoot applications on mainframe computer systems, such as IBM's z/OS. They typically work with languages like COBOL, JCL, and CICS, and are responsible for ensuring the performance, security, and reliability of mission-critical business applications. Mainframe Developers are commonly employed in industries like banking, insurance, and government, where large-scale, high-volume transaction processing is essential.

What are the key skills and qualifications needed to thrive as a Mainframe Developer, and why are they important?

To thrive as a Mainframe Developer, you need expertise in programming languages such as COBOL, JCL, and SQL, along with a strong understanding of mainframe operating systems and batch processing concepts. Familiarity with tools like IBM z/OS, DB2, CICS, and version control systems is typically required, and certifications from IBM or related organizations can be beneficial. Strong problem-solving abilities, attention to detail, and effective communication skills help Mainframe Developers excel in troubleshooting and collaborating with cross-functional teams. These skills are crucial for maintaining, optimizing, and modernizing legacy systems that are vital to many large organizations’ operations.

Can mainframe be replaced by AI?

Mainframe developers work with large-scale, legacy systems that require specialized knowledge of mainframe environments, programming languages, and security protocols. While AI can automate certain tasks like code analysis and testing, it is unlikely to fully replace mainframe developers due to the complexity and critical nature of mainframe systems. Instead, AI tools are used to augment their work and improve efficiency.
What are popular job titles related to Mainframe Developer jobs in Connecticut? For Mainframe Developer jobs in Connecticut, the most frequently searched job titles are:
What job categories do people searching Mainframe Developer jobs in Connecticut look for? The top searched job categories for Mainframe Developer jobs in Connecticut are:
What are popular job titles related to Mainframe Developer jobs in CT? For Mainframe Developer jobs in CT, the most frequently searched job titles are:
Mainframe Developer jobs near you
Infographic showing various Mainframe Developer job openings in Connecticut as of June 2026, with employment types broken down into 68% Full Time, 21% Part Time, 4% Temporary, and 7% Contract. Highlights an 83% Physical, 7% Hybrid, and 10% Remote job distribution, with an average salary of $105,618 per year, or $50.8 per hour.
Mainframe Systems Programmer

Mainframe Systems Programmer

InstantServe LLC

Hartford, CT • On-site

$55.50 - $70.50/hr

Full-time

Posted 2 days ago

Job description

Job Title: Mainframe Systems Programmer - Hybrid (Connecticut)
Location: Hybrid - Connecticut (Local Candidates Only)
Duration: Long-Term Contract
Job Overview
The Connecticut Department of Social Services (DSS) is seeking an experienced Mainframe Systems Programmer to support a large-scale enterprise data migration and legacy modernization initiative. This role requires a senior-level professional with extensive hands-on experience in mainframe technologies, data conversion, system analysis, and batch processing environments. The selected candidate will play a key role in analyzing legacy applications, extracting and converting data, and supporting migration efforts from IMS-based systems to modern target platforms.
Key Responsibilities
  • Analyze and document existing legacy mainframe applications and business processes.
  • Design, develop, and execute data extraction, conversion, and migration solutions.
  • Modify, maintain, and enhance COBOL programs and JCL scripts to support migration activities.
  • Work extensively with IMS databases, including data analysis, validation, and reconciliation.
  • Develop and execute batch processing solutions and troubleshoot production issues.
  • Utilize FTP/SFTP processes for secure file transfers and data movement.
  • Perform data validation, quality assurance, and reconciliation between source and target systems.
  • Support testing activities, including unit, integration, system, and user acceptance testing.
  • Create technical documentation, migration procedures, and operational support materials.
  • Collaborate with business stakeholders, technical teams, and project management throughout the migration lifecycle.
  • Identify and resolve complex system and data-related issues independently.
Required Qualifications
  • 10+ years of experience as a Mainframe Systems Programmer or Mainframe Developer.
  • Strong hands-on experience with:
    • COBOL
    • JCL (Job Control Language)
    • IMS Database
    • Mainframe Development and Support
  • Experience performing data extraction, conversion, migration, and reconciliation activities.
  • Strong knowledge of batch processing environments and scheduling.
  • Experience with FTP/SFTP file transfer processes.
  • Proven ability to analyze and troubleshoot complex legacy systems.
  • Strong documentation, communication, and problem-solving skills.
  • Ability to work independently in a fast-paced project environment.
Preferred Qualifications
  • Experience with BMC Utilities for IMS.
  • Experience using File-AID, EZtrieve, CLIST, and REXX.
  • Prior involvement in legacy modernization or large-scale data migration projects.
  • Experience in government, healthcare, insurance, or financial services environments.
  • Familiarity with enterprise data integration and modernization initiatives.
Additional Information
  • Hybrid work arrangement within Connecticut.
  • Candidates must currently reside in Connecticut.
  • Strong preference for candidates with prior state government or public sector experience.
  • Immediate interviews for qualified local candidates.
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About InstantServe

Sourced by ZipRecruiter

InstantServe provides a one-stop solution to all Healthcare, IT/Non-IT Staffing needs. Established in 2016, InstantServe is a strong workforce of over 100+ go-getters with a demonstrated background in IT/Non-IT service. We are a nationally certified SBE from the Department of Administration (State of PA). As a proud Minority Woman Owned Small Business Enterprise (M/WBE), InstantServe boasts of a strong team of professionals who have extensive experience catering to several Federal, Public, Commercial, and Healthcare Clients which includes 26 States and 46 government agencies. InstantServe is a client-centric organization that offers cost-effective and reliable solutions. Client satisfaction is sacrosanct! Our team strives to provide the best staffing and IT solutions to take your business to the next level.

Industry

Recruiting and staffing services

Company size

11 - 50 Employees

Headquarters location

Wayne, PA, US

Year founded

2016

Social media

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