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# Mainframe Developer - ADABAS/Natural & BS2000 Job ID: JP054980

- **Company:** ITProposal
- **Location:** Brussel, Belgium
- **Contract:** Permanent contract
- **Skills:** Adaptable Database Systems, Learning Management Systems, Data Transformation, Data Mining, Data Synchronization, Linux, Job Control Language (JCL), Linux System Administration, Mainframes, Data Streaming, Database Replication, Data Objects, Legacy Systems
- **Published:** August 5, 2026
- **Apply:** https://www.careerjet.be/jobad/bee7920b34c080aeca2fa849223b91420b

## About the Role

* Strong experience with Natural for BS2000 8.2.7+.
 * Strong knowledge of ADABAS for Mainframe BS2000 8.2.
 * Experience with BS2000, SDF, JCL, EDT and LMS.
 * Knowledge of data replication, data transformation and reconciliation.
 * Strong analytical and testing mindset.
 * Ability to work with legacy systems and limited documentation.
 * Active knowledge of Dutch, French and English.
 * On-site: Minimum 2 days/week in Brussels, depending on tasks and team requirements.

## Description

We are looking for an experienced Mainframe Developer to support the controlled migration of a critical ADABAS/Natural environment on BS2000 to a Linux platform, while maintaining reliable parallel operations.
Key Responsibilities

 * Develop technical modules for data extraction, transformation and replication.
 * Analyse existing Natural/ADABAS programs, jobs, data objects and data flows.
 * Establish data synchronisation between BS2000 and Linux environments.
 * Develop and execute technical testing and data reconciliation.
 * Validate data completeness, mappings, transformations and identify missing or duplicate records.
 * Document technical solutions, mappings, test results and corrective actions.


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