Hi, I'm

Daniel Diaz

Data Quality Specialist / Madrid, Spain

I make data trustworthy: data quality, governance and observability so decisions rest on numbers that hold up.

SQL✦Python✦Power BI✦Alteryx Designer✦Data profiling✦Reconciliation✦Root cause analysis✦Quality KPIs✦SAP S/4HANA✦SAP Sales Cloud✦Reltio MDM✦Dun & Bradstreet✦Master data✦Data stewardship✦Control documentation✦GDPR✦TypeScript✦Next.js✦SQLite✦Docker✦Git✦SQL✦Python✦Power BI✦Alteryx Designer✦Data profiling✦Reconciliation✦Root cause analysis✦Quality KPIs✦SAP S/4HANA✦SAP Sales Cloud✦Reltio MDM✦Dun & Bradstreet✦Master data✦Data stewardship✦Control documentation✦GDPR✦TypeScript✦Next.js✦SQLite✦Docker✦Git✦

01About me

I'm a Data Quality Specialist at Radisson Hotel Group, making sure the customer and account data feeding SAP S/4HANA, SAP Sales Cloud and the group's MDM is complete, consistent and reliable. I joined in October 2024 as a Revenue Systems trainee and moved to the Data Quality team four months later.

Before that I spent seven years running restaurants and a leisure park in London and Madrid. It sounds far from data, but it was the opposite: every day I made decisions on sales, costs, staffing and inventory from numbers, and I learned first-hand what bad data costs. That pivot shapes how I work today: I understand the business that consumes the data because I have sat in its chair.

Outside work I build things on my own, like Beacon TCG: a Pokémon card price tracker with a daily data pipeline, quality rules and its own server. It is where I practise the same craft as at work, end to end.

Skills

Data

SQLPythonPower BIAlteryx DesignerData profilingReconciliationRoot cause analysisQuality KPIs

Enterprise systems

SAP S/4HANASAP Sales CloudReltio MDMDun & Bradstreet

Data governance

Master dataData stewardshipControl documentationGDPR

Other

TypeScriptNext.jsSQLiteDockerGit