About this role
Oliver James is partnering with a leading enterprise organization migrating its core legacy systems from Adabas (Mainframe) to PostgreSQL. We are seeking a Data Functional Analyst to bridge the gap between legacy business logic and modern database architecture.
- Working directly alongside Data Engineers and DBAs, you will define data mappings and ensure a seamless, high-integrity migration.
Key responsibilities
Legacy Data Analysis & Mapping: Deep-dive into Mainframe data structures and define accurate functional target mappings to PostgreSQL relational schemaq Technical & Functional Guidance: Act as the primary functional advisor for Data Engineers and DBAs, writing clear functional specifications to guide ETL/ELT pipeline development and schema design Data Quality & Reconciliation: Design data validation strategies, define test scenarios, and execute cross-database reconciliation checks (Mainframe legacy vs. PostgreSQL) to guarantee 100% data integrity and consistency Data Lineage & Documentation: Maintain comprehensive data dictionaries, mapping rulebooks, and lineage documentation throughout the migration lifecycle Cross-Functional Collaboration: Serve as the functional point of contact for resolving legacy data ambiguities and translating complex business rules for the technical delivery team Functional Data Expertise: 3 years of experience as a Data Functional Analyst, Business Data Analyst, or Data Consultant on large-scale data transformation projects Database & SQL Skills: Strong, mandatory expertise in PostgreSQL and advanced proficiency in SQL and relational data modelling concepts Mainframe Experience: Solid functional understanding of Mainframe database environments (knowledge of Adabas is nice to have, but not mandatory) Migration Track Record: Hands-on experience working on complex legacy-to-relational data migration projects Language skills Fluent English (written and spoken) Professional fluency in French and/or Dutch (essential for local team and business stakeholder collaboration) Communication & Mindset: Excellent analytical skills, rigorous attention to detail, and the ability to articulate complex functional rules clearly to technical teams