ZipRecruiter

Log In

1

Senior Mainframe Programmer Jobs in Connecticut (NOW HIRING)

InstantServe LLC

Mainframe Systems Programmer

Hartford, CT · On-site

$55.50 - $70.50/hr

Mainframe Systems Programmer - Hybrid (Connecticut) Location: Hybrid - Connecticut (Local ... This role requires a senior-level professional with extensive hands-on experience in mainframe ...

Chubb

Head of Data Engineering, PRS

Simsbury, CT · On-site

... as a senior Data Leader here at Chubb. You will be entrusted to apply your leadership and ... You'll leverage your Mainframe and Data modernization, AI, engineering, technical, business and ...

Chubb

Head of Data Engineering, PRS

Simsbury, CT · On-site

$224K - $314K/yr

... as a senior Data Leader here at Chubb. You will be entrusted to apply your leadership and ... You'll leverage your Mainframe and Data modernization, AI, engineering, technical, business and ...

NBT Bank

Project Manager

Lakeville, CT

$84K - $112K/yr

Prior experience in design specifications and coding in a mainframe and client/server environment ... Understanding of programming requirements and file structures Tasks Performed: * 25% Develops and ...

All JobsMainframe Programmer JobsSenior Mainframe Programmer JobsSenior Mainframe Programmer Jobs in Connecticut

Senior Mainframe Programmer information

What is the difference between Senior Mainframe Programmer vs Mainframe Developer?

AspectSenior Mainframe ProgrammerMainframe Developer
CredentialsTypically requires a mainframe programming certification and several years of experienceOften requires similar certifications and experience, focusing on coding and development
Work EnvironmentWorks primarily on legacy mainframe systems within financial, insurance, or government sectorsDevelops and maintains mainframe applications, often in similar industries
Employer & Industry UsageCommonly employed by large corporations with mainframe infrastructureUsed interchangeably with mainframe programmer, focusing on application development

The main difference between a Senior Mainframe Programmer and a Mainframe Developer is primarily experience level and scope. Senior Mainframe Programmers often have more responsibilities, including overseeing projects and mentoring junior staff, while Mainframe Developers focus on coding and application creation. Both roles require similar credentials and are vital in industries relying on legacy mainframe systems.

What are popular job titles related to Senior Mainframe Programmer jobs in Connecticut? For Senior Mainframe Programmer jobs in Connecticut, the most frequently searched job titles are:
What job categories do people searching Senior Mainframe Programmer jobs in Connecticut look for? The top searched job categories for Senior Mainframe Programmer jobs in Connecticut are:
Senior Mainframe Programmer jobs near you
Infographic showing various Senior Mainframe Programmer job openings in Connecticut as of July 2026, with employment types broken down into 2% Locum Tenens, 82% Full Time, 5% Part Time, 1% Temporary, 9% Contract, and 1% Summer. Highlights an 84% Physical, 5% Hybrid, and 11% Remote job distribution.
Mainframe Systems Programmer

Mainframe Systems Programmer

InstantServe LLC

Hartford, CT • On-site

$55.50 - $70.50/hr

Full-time

Posted 8 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.
InstantServe logo

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

FacebookTwitter

View All InstantServe Jobs

Apply