Senior Mainframe Developer — COBOL/DB2, Flexible Location

Accenture Poland; Warszawa; Hybrid; PLN 180,000 - 280,000; Full time

Benefits offered by this job

Permanent contract

Private medical care

Life insurance

Employee Assistance Program

Training & certifications

Coaching support

Job summary

Accenture Poland is seeking a skilled IBM Mainframe developer to maintain and modernize critical banking applications. You will work with COBOL, JCL, CICS, z/OS and DB2 across international teams, focusing on performance improvements and enabling AI-assisted upgrades.

Expect a mix of remote and onsite collaboration with opportunities for mentoring junior staff and continuous professional growth in a global delivery environment.

Qualifications

• Minimum 5 years of commercial experience in development and maintenance of IBM Mainframe applications.
• Strong knowledge of COBOL, JCL, CICS, and z/OS.
• Practical experience with DB2 databases, SQL development, query optimization, and data analysis.
• Ability to analyze business requirements and independently design and implement technical solutions.
• Experience troubleshooting production issues and optimizing existing applications.
• English proficiency at minimum B2 level.

Responsibilities

• Develop and maintain IBM Mainframe applications supporting key banking processes.
• Analyze requirements and design scalable Mainframe solutions using COBOL, JCL, CICS, z/OS and DB2.
• Diagnose and resolve production issues and optimize performance.
• Collaborate with international project teams on modernization initiatives including automation and AI.
• Mentor less experienced developers and promote knowledge sharing.

Skills

English proficiency (B2)

Analytical thinking

Team collaboration

Proactive/self-driven

Mentoring juniors

Problem solving

Tools

COBOL

JCL

CICS

z/OS

DB2

Git

Bitbucket

CI/CD

Job description

Accenture Poland is seeking a skilled IBM Mainframe developer to maintain and modernize critical banking applications. You will work with COBOL, JCL, CICS, z/OS and DB2 across international teams, focusing on performance improvements and enabling AI-assisted upgrades.

Expect a mix of remote and onsite collaboration with opportunities for mentoring junior staff and continuous professional growth in a global delivery environment.