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DSI

Mainframe Developer – Public Sector

DSI

. Support a major public-sector client with the maintenance and enhancement of its applications in a mainframe environment .

Posted 10/19/2026full-timeFontenay-sous-Bois • FranceMid-LevelSeniorWebsite

Core Competencies

Role fit
Core Competencies

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Demonstrates expertise in Mainframe application development and enhancement, with strong skills in COBOL, JCL, and DB2. Proficient in analyzing business needs, performing testing, and resolving defects within a complex application portfolio.

Highest-signal resume keywords
Mainframe DevelopmentCOBOL DevelopmentJCL KnowledgeDB2 KnowledgeDefect Diagnosis

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills
Mainframe DevelopmentCOBOL DevelopmentJCL KnowledgeDB2 KnowledgeJava KnowledgeApplication EnhancementDefect ResolutionUnit TestingTechnical DocumentationBusiness Analysis
Soft Skills
Collaborative WorkIndependent WorkProblem Solving
Tools & Technologies
Z/OS EnvironmentMainframe Applications
Industry Keywords
Public SectorLarge-Systems DevelopmentTransactional Environments

Tech Stack

Tools & technologies
Java

About the role

Key responsibilities & impact
  • Support a major public-sector client with the maintenance and enhancement of its applications in a mainframe environment
  • Analyze business needs and enhancement requests
  • Review the existing environment and contribute to the design of technical solutions
  • Develop and enhance Mainframe applications
  • Perform unit testing and participate in the various acceptance-testing phases
  • Analyze, diagnose, and resolve defects
  • Contribute to the ongoing enhancement and maintenance of applications
  • Ensure the quality and maintainability of delivered developments
  • Contribute to technical documentation
  • Work collaboratively with developers, analysts, and project managers
  • Share expertise and contribute to the team’s best practices
  • Gradually develop an understanding of the client’s functional context and application portfolio

Requirements

What you’ll need
  • Proven experience in Mainframe / large-systems development
  • Ability to work independently on an existing application portfolio
  • Strong command of COBOL development in a Mainframe environment
  • Good knowledge of the z/OS environment
  • Strong command of, or good knowledge of, JCL
  • Knowledge of DB2
  • Java knowledge is a plus
  • Knowledge of Mainframe transactional environments is a plus
  • Ability to analyze and understand existing programs
  • Experience in application enhancement and corrective maintenance
  • Proficiency in testing, defect diagnosis, and defect resolution practices
  • Ability to work on a complex application portfolio
  • Screen-based work
  • 35 hours per week
  • In accordance with applicable employment obligations, equally qualified applicants with disabilities and other beneficiaries of the employment obligation will be given priority

Benefits

Comp & perks
  • Meal vouchers
  • Health insurance
  • 50% public transport reimbursement
  • Gift vouchers
  • Vacation bonus
  • Disability and life insurance
  • Work–life balance support (working hours, workstation adjustments, remote work, etc.), subject to the requirements of the position
  • Works Council benefits