Decommissioning Consultant

Keystone Solutions; Brussel; Remote; EUR 92,000 - 148,000; Full time

Job summary

Keystone Solutions seeks a skilled consultant for a four-month mission at a client site to transform a legacy ADABAS/Natural/BS2000 setup to Linux while keeping operations uninterrupted.

You will build modules for data extraction, transformation, and replication, and establish a parallel run mechanism to ensure smooth coexistence of both environments, with thorough testing and documentation.

Qualifications

• Strong knowledge of ADABAS mainframe environment, Natural and BS2000.
• Ability to analyze and understand poorly documented legacy applications.
• Proficiency in documenting analyses, modules, mappings, test results, and decisions clearly.

Responsibilities

• Analyze existing legacy processes and interpret data objects.
• Develop modules for data extraction, transformation, replication, and validation to Linux.
• Ensure BS2000 and Linux run in parallel with minimal disruption to feeding processes.
• Conduct testing, source-target data comparisons, reconciliation checks, and document results and corrective actions.

Skills

ADABAS

Natural

BS2000

Data reconciliation

Data replication

Data transformation

Office 365

Tools

SDF

JCL

EDT

LMS

Job description

Mission Overview:

Keystone Solutions is seeking a skilled consultant for a critical mission at a client site focused on digital transformation. The project involves transitioning a legacy ADABAS/Natural database environment from BS2000 to a new Linux platform while ensuring existing operations remain uninterrupted. As a consultant, you will be representing Keystone Solutions and will be engaged in building technical modules for data extraction and transformation, as well as establishing a replication mechanism for parallel operation of both environments.

Key Responsibilities:

• Analyze existing legacy processes and interpret data objects accurately.
• Develop technical modules that facilitate data extraction, transformation, replication, and validation towards the Linux platform.
• Work on mechanisms to ensure the BS2000 and Linux environments function in parallel without immediate adjustments to existing feeding processes.
• Conduct testing and validation, including technical test scenarios, source-target data comparisons, reconciliation checks, and documentation of test results and corrective actions.

Requirements:

• Strong knowledge of the BS2000 mainframe environment, particularly Natural and ADABAS.
• Ability to analyze and understand poorly documented legacy applications.
• Proficiency in documenting analyses, developed modules, mappings, test results, and technical decisions clearly and systematically.
• Proactive approach to identifying missing information, signaling risks, and proposing solutions.
• Capability to prioritize tasks within a complex environment with multiple databases and technical dependencies.
• Test-oriented mindset to ensure data is transferred correctly, completely, timely, and reliably.

Soft Skills:

• Attention to detail and accuracy due to the critical nature of the data.
• Ability to work independently and analyze existing programs, jobs, objects, and data streams.
• Strong communication skills for effective documentation and team collaboration.

Why Join Keystone Solutions:

As a consultant at Keystone Solutions, you will engage in dynamic projects that offer diverse challenges across various client environments. You will experience turbo-charged learning opportunities and have the chance to skyrocket your ambition within a framework that values professional growth. Being a 'K-Stone' means bringing our core values to every engagement, ensuring a meaningful impact in your work.

Duration:

15/09/2026 - 31/12/2026 4 months (full time)

Skills required:

• ADABAS for Mainframe BS2000 version 8.2. - Level: Confirmed - Most recent: Any time
• BS2000 : SDF, JCL, EDT, LMS - Level: Confirmed - Most recent: Any time
• Data reconcilliatie - Level: Junior - Most recent: Any time
• Data replicatie, Data transformatie - Level: Junior - Most recent: Any time
• Natural for Mainframes BS2000 version 8.2.7 (ou plus haut) - Level: Confirmed - Most recent: Any time
• Office 365 - Level: Confirmed - Most recent: Any time

Language requirements:

• Dutch - Level Active knowledge
• English - Level Active knowledge
• French - Level Active knowledge