HRIS Data Migration Specialist; Brussel

We are seeking a skilled HRIS Data Migration Specialist to lead the end-to-end migration of HR data from SAP R/3 HCM (PA/OM/Time/PY) to SAP Success Factors Employee Central and S/4

HANA Time. This role is critical to ensuring data integrity, compliance, and operational continuity during the HRIS transformation roadmap from Success.

• Define and document the data migration strategy & plan aligned with the SF EC and S/4
  
  HANA HCM rollout.
• Establish data selection principles (what moves vs. what is archived/destroyed), aligned with legal, regulatory, works council, information security, and GDPR requirements.
• Develop the data object inventory and field-level mapping specifications.
• Define archiving and defensible data destruction approaches for out-of-scope or redundant data, with audit trails and approvals.
• Set up governance: RACI, decision rights, issue/risk management, status reporting, and issue escalation.
• Collaborate with HR & IT and business stakeholders to define scope, timelines, and deliverables.

• Inventory source systems (SAP ECC HCM and non-SAP), objects, infotypes, tables, and custom fields; determine target structures in Success Factors (Employee Central, Recruiting, Onboarding) and S/4
  
  HANA (Finance-related HR data, HCM compatibility or integrations as applicable).
• Lead the data mapping and transformation logic definition, including value mapping, code translations, derived fields, joins, historical vs. current snapshots, and effective dating.
• Produce mapping specifications and governed transformation rules with version control for all in-scope data sets.

• Use data conversion tools, such as Spinifex, Data Conversion Manager or other, to set up data mapping, data comparison, and load the data from the source to target systems.
• Build repeatable, parameterized ETL/ELT pipelines for extract, cleanse, transform, and load.
• Extract legacy data from SAP R/3 HCM modules (PA, OM, Time, Payroll).
• Cleanse, transform, and map data to Success Factors EC and S/4
  
  HANA HCM structures.
• Use SAP Business Integration Builder, SAP Cloud Platform Integration, and data migration tools for replication and transformation.
• Implement data quality rules, exception handling, logging, and reconciliation checks (e.g., counts/balances, hash totals, key field completeness).

• Plan and run multiple mock loads (ML1–ML3) across environments; track defects, root causes, and trend improvements.
• Drive data cleansing at source (with HR data owners) and within transformation layers; establish golden source decisions and survivorship rules for consolidated records.
• Produce data quality scorecards and measurable KPIs (completeness, validity, uniqueness, consistency, timeliness).
• Manage cutover dry‑runs, timing simulations, and performance tuning for load windows.

• Define and execute E2E testing for migration objects: unit tests, SIT, UAT support, and parallel run/payroll impact checks where relevant.
• Support User Acceptance Testing and parallel runs to ensure data accuracy.
• Implement reconciliation and sign‑off controls with business owners: pre/post-load controls, sampled record validation, and audit evidence.
• Ensure privacy‑by‑design and security‑by‑design throughout (masking in non‑prod).
• Build and execute the Cutover Plan for go‑live, including freeze windows, sequencing, runbook, roles, checkpoints, back‑out criteria, and communications.
• Orchestrate go‑live weekend activities, triage, and rapid defect resolution with functional and technical teams.
• Deliver hyper‑care reconciliation, issue remediation, and handover to operations/support with documentation and knowledge transfer.

• Maintain comprehensive documentation of mappings, transformation logic, and data.
• Ensure compliance with GDPR and internal data governance policies.

• 7+ years in data migration (at least 3+ in HR data), delivering complex, multi‑system migrations at enterprise scale.
• Proven experience in SAP HCM data migration projects, especially involving SF EC and S/4
  
  HANA.
• Proven hands‑on expertise with data migration tools (Info porter, Spinifex, DCM), SAP BIB, CPI, IDoc, and OData services.
• SAP Certification in Success Factors EC and/or SAP Integration Suite.
• Experience in hybrid SAP HCM landscapes and phased rollouts.
• Fluency in Dutch, French, and English (minimum B2 for all three).

• Knowledge of HR master data, organizational structures, and payroll‑relevant data.
• Knowledge of data mapping and transformation logic and techniques.
• Knowledge of SAP ECC HCM (PA/OM, Time, Payroll, Benefits) and data structures (infotypes, clusters), plus exposure to custom Z‑tables.
• Knowledge of Success Factors EC Data Model, Object Types and data structures.
• Problem‑solving capabilities.