Senior Cobol & Java Software Engineer

November 6, 2026

Senior

Warszawa, Poland

Indeed

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Includes on-call duty

Description

Senior software engineer needed for business-critical systems where mainframe technologies coexist with modern Java solutions. The role focuses on improving existing systems, bridging mainframe and modern application development, and supporting gradual technology modernization. Candidates go through a screening call and meetings with a talent partner, technical expert, future manager and team before signing the contract.

Responsibilities

Contribute actively to technical design and architectural discussions
Challenge existing solutions where there is a better way forward
Help bridge the gap between mainframe and modern application development
Support the modernization and gradual evolution of our technology landscape
Take responsibility from refinement and technical analysis through implementation, testing, and production
Contribute to a strong engineering culture focused on quality, collaboration, and continuous improvement

Requirements

Strong experience with COBOL and mainframe development
Solid hands-on experience with Java
Experience working with business-critical and complex systems
Ability to understand and work with existing codebases as well as develop new solutions
A structured approach to software quality, testing, maintainability, and production stability
Experience troubleshooting issues across applications and technologies
Ability to collaborate closely with developers, testers, business experts, and other stakeholders
Comfortable taking ownership and driving technical discussions and solutions
Willingness to share knowledge and support less experienced colleagues

Conditions

Professional development budget
Healthy, varied lunch and fruit in the canteen
Active staff associations: yoga, cycling, salsa dancing etc.
Flexible starting time
Health insurance
Referral bonus

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