Mainframe Application Developer - Modernization

CTG is seeking to fill a Mainframe Application Developer - Modernization position for our client.

Onsite 4 days per week in either New York, NY or Pittsburgh, PA

6 months

• Develop, enhance, maintain, and modernize mainframe applications supporting critical business functions.
• Analyze existing mainframe applications and identify opportunities for modernization, optimization, and improved performance.
• Support application modernization initiatives, including language migration and integration with non-mainframe environments.
• Develop and maintain applications using COBOL, CICS, and DB2.
• Design and implement APIs and integration solutions connecting mainframe applications with distributed and cloud-based environments.
• Collaborate with cross-functional teams, architects, business stakeholders, and technology teams to define and implement modernization solutions.
• Troubleshoot application issues, perform root‑cause analysis, and implement sustainable solutions.
• Contribute to the adoption of modern technologies such as Java and/or Python alongside existing mainframe technologies.
• Participate in code reviews, testing, deployment, and ongoing application support.
• Ensure solutions meet organisational standards for quality, security, performance, and reliability.

• Strong mainframe application development skills.
• Proficiency with COBOL, CICS, and DB2.
• Experience with application modernization and transformation initiatives.
• Knowledge of APIs and integration between mainframe and non-mainframe environments.
• Experience with application optimisation and performance improvement.
• Exposure to or experience with Java and/or Python in conjunction with mainframe technologies.
• Strong analytical, problem‑solving, and troubleshooting skills.
• Excellent verbal and written communication skills.
• Ability to work effectively with technical and business stakeholders.

• 10+ years of industry experience.
• Extensive experience developing and supporting mainframe applications.
• Demonstrated experience with CICS, COBOL, and DB2.
• Experience participating in application modernization initiatives, including one or more of the following:
  • Language migration.
  • Mainframe integration with non‑mainframe environments using APIs.
  • Application optimisation.
  • Use of Java and/or Python with mainframe technologies.
• Experience in the financial services and/or cash management industry strongly preferred.
• Experience working in collaborative, enterprise technology environments.

• Bachelor's degree in Computer Science, Information Technology, or a related field preferred, or equivalent combination of education and experience.

Excellent verbal and written English communication skills and the ability to interact professionally with a diverse group are required.

CTG, a Cegeka company, delivers IT and business solutions that enhance clients’ digital agility, empowering them to seize new opportunities and overcome any challenge. Backed by more than 60 years’ experience and a commitment to being a reliable, results‑driven partner, we work shoulder to shoulder with clients to shape digital together. Our vision is to be an indispensable partner to our clients and the preferred career destination for digital and technology experts.

With more than 9,000 team members in over 15 countries, we combine global expertise with local insight to deliver innovative solutions. We operate across the Americas, Europe, and India, working with over 3,000 clients in many of today’s highest‑growth industries.

Together, we shape what’s next—working shoulder to shoulder to deliver impactful solutions for our clients and society. Our culture is built by the people who work at CTG, the values we hold, and the actions we take. It’s a living, breathing thing…