Data systems for decisions — and delivery.

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Freelance servicesPortfolioData tools

From raw data to clear decisions.

Portfolio lists five ML-system builds (serving, batch scoring, RAG, feature pipelines, monitoring). Data tools lists five interactive apps (cleaning, profiling, AI reports, KPI views, forecasting). Services is different: fixed-scope work for teams and owners—mostly Sheets, Power BI, and Python—priced and delivered as business outcomes, not as public demos.

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Dashboard & KPI reporting
One place to see performance: KPIs, trends, and breakdowns in Excel, Google Sheets, or Power BI—aligned with how I think about KPI apps in Data tools, but built on your data and your stack.

Typical project range: €300 – €900

DashboardKPI definitionsdocumentationExcel
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Data cleaning, profiling & prep
Messy tables turned into something you can trust: cleaning, profiling, and documentation so the next step—dashboards, forecasts, or automation—does not collapse under bad inputs.

Typical project range: €120 – €400

Clean dataprofile summarydocumentationExcel
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Reporting & spreadsheet automation
Stop rebuilding the same report every week. Scheduled or on-demand pipelines—in Sheets, Apps Script, or Python—that mirror the discipline behind batch scoring: same inputs, same rules, reproducible outputs.

Typical project range: €200 – €700

Automated workflowsscriptsdocumentationExcel
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Analysis, forecasting & AI-assisted reporting
Marketing and ops reporting, simple time-series forecasts, and optional AI-written summaries over aggregates—without running your campaigns for you. Same spirit as the forecasting and AI analysis demos, scoped to your files and questions.

Typical project range: €150 – €550

Reportsforecasts where fitoptional AI summaryAnalytics
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Custom ML, batch scoring & APIs
When a spreadsheet is not enough: a small API, a recurring scoring job, document Q&A over your own corpus, or monitoring checks on batches—scoped engagements. Public reference implementations live under Portfolio; here the code targets your problem and your constraints.

Typical project range: €1,200 – €8,000

Codemodel or index artefactsrunbookPython
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How I Work

1. Understand the Problem
I start by understanding your current reporting, data, or workflow problem.
2. Review the Data and Tools
I look at the data sources, reporting structure, and tools currently in use.
3. Build a Practical Solution
I create a clear and usable solution, whether it is a dashboard, analysis workflow, or reporting setup.
4. Refine for Real Use
The final output should not only work technically, but also be practical for day-to-day business use.

Tools I Work With

PythonSQLExcelGoogle SheetsPower BILooker StudioAPIsCSV and spreadsheet workflows

Let's Talk About Your Reporting or Data Workflow

If you need help with dashboards, reporting, data analysis, or workflow automation, feel free to get in touch.

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© 2026 Vahdettin Karataş. All rights reserved.
ML systems, reporting & automation.
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