Ondrej T.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Nov 5, 2026.

Dashboards should do one thing above everything else: make people want to use them. After 12+ years in enterprise BI — including senior roles at Deloitte and IBM Global Consulting Services — I've learned that the difference between a dashboard that gathers dust and one that shapes decisions comes down to design precision, a well-modelled semantic layer, and an intuitive understanding of how end-users think. I specialize in Power BI and Tableau, working across the full stack: from DAX-heavy semantic model engineering and Azure/Microsoft Fabric architecture to custom visuals built with TypeScript, D3.js, and the Power BI Custom Visuals SDK. Two of my visuals — a Cash Flow Waterfall Chart and a Funnel Chart — are published on Microsoft AppSource. Client work spans pharma & life sciences (Novo Nordisk), fertility medicine, financial services, and manufacturing across Germany, the Netherlands, the UK, and Denmark. ──────────────────────────── WHAT I DELIVER ──────────────────────────── ✓ Power BI reports, dashboards & semantic models (end-to-end) ✓ Microsoft Fabric: lakehouses, Dataflows Gen2, Synapse pipelines, Real-Time Analytics ✓ Looker & LookML: data modelling, Explore design, embedded analytics ✓ AppSource-ready custom visual development (TypeScript / D3.js) ✓ DAX engineering: cohort analysis, time intelligence, dynamic parameters ✓ Azure data architecture & cloud-native BI ✓ Tableau: LOD expressions, calculated fields, server deployments ✓ BI strategy, architecture & governance ──────────────────────────── MY 4-CHECKPOINT PROCESS ──────────────────────────── 01 Kick-off with actual end-users to collect user stories 02 Each story mapped to a concrete DUX element 03 Prototype built on your data (or generated sample) within 48 hours 04 Delivery with full documentation, source files & training session ──────────────────────────── TECHNOLOGY STACK ──────────────────────────── Power BI · DAX · Power Query · Microsoft Fabric · Azure Synapse Tableau · Looker