COBOL Mainframe Developer

Job Description

Insight Global is seeking a COBOL Mainframe Developer for a top enterprise client operating in a legacy-heavy environment undergoing modernization. This candidate will be responsible for maintaining and enhancing mission-critical mainframe applications while supporting integration with modern web technologies. The ideal candidate brings deep COBOL expertise along with exposure to modern front-end frameworks such as React, Angular, and HTML5, enabling seamless collaboration across legacy and digital platforms. This role offers the opportunity to work in a fully remote setting while supporting on-prem infrastructure, playing a key role in the client’s digital transformation journey.

Day-to-Day:

• Develop, maintain, and enhance COBOL-based mainframe applications

• Support integration efforts between mainframe backends and modern web UI (React/Angular)

• Write and optimize SQL queries for backend data processing

• Troubleshoot and resolve issues in production and QA environments

• Assist with modernization efforts bridging legacy and distributed systems

• Perform code reviews, testing, and technical documentation

• Collaborate with cross-functional teams supporting on-prem systems remotely

We are a company committed to creating diverse and inclusive environments where people can bring their full, authentic selves to work every day. We are an equal opportunity/affirmative action employer that believes everyone matters. Qualified candidates will receive consideration for employment regardless of their race, color, ethnicity, religion, sex (including pregnancy), sexual orientation, gender identity and expression, marital status, national origin, ancestry, genetic factors, age, disability, protected veteran status, military or uniformed service member status, or any other status or characteristic protected by applicable laws, regulations, and ordinances. If you need assistance and/or a reasonable accommodation due to a disability during the application or recruiting process, please send a request to View email address on click.appcast.io learn more about how we collect, keep, and process your private information, please review Insight Global's Workforce Privacy Policy:

Skills and Requirements

• Strong experience with Mainframe Programming (COBOL)

• Hands-on development in legacy mainframe environments

• Experience with SQL backend/database development

• Strong debugging and troubleshooting skills in production environments

• Experience with JCL, batch processing, and mainframe utilities

• Ability to support on-prem infrastructure remotely • Experience with modern front-end technologies (React, Angular, HTML5)

• Exposure to full-stack or hybrid development environments (mainframe + web apps)

• Experience integrating mainframe systems with modern UI frameworks

• Strong SQL optimization and performance tuning experience

• Familiarity with API development or middleware connecting legacy systems to web apps

• Experience supporting or contributing to legacy modernization initiatives

• Knowledge of Agile environments or DevOps practices (CI/CD for hybrid systems)

• Industry experience in financial services, insurance, or enterprise legacy environments