Power BI Specialist

Location:

Hybrid role based in South Wales
Contract Length:
Initial 3-6 months (extension likely)
Day Rate: £400 per day (Outside IR35)

Role Overview
We are seeking an experienced Power BI Specialist contractor to own enterprise semantic modelling, advanced DAX development and reporting governance.

This is a hands‑on technical role focused on Power BI semantic models, not dashboard production. You will design, optimise and govern certified enterprise datasets built on the Gold data layer, enabling analysts to self‑serve confidently while protecting core business logic.

Key Responsibilities
Enterprise Semantic Modelling

Design, build and maintain enterprise Power BI semantic models using star schema and dimensional modelling best practice.
Develop advanced DAX measures, calculation groups and reusable logic
Ensure datasets reflect authoritative, agreed business definitions
Implement time‑aware models, surrogate keys and conformed dimensions

Performance & Optimisation

Diagnose and resolve performance issues across large and complex models
Optimise models through:
Measure refactoring
Cardinality reduction
Relationship and filter‑direction optimisation
Advise on Import, Direct Query and Composite storage strategies

Governance & Hybrid Model Operation

Certify and endorse enterprise semantic models
Enforce separation between certified datasets and exploratory/self‑service reporting
Prevent duplication of KPIs, measures and business logic
Define and embed dataset lifecycle and workspace standards

What you need to do now
If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or call us now.

If this job isn't quite right for you, but you are looking for a new position, please contact us for a confidential discussion about your career.

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