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DataTideHH/README.md

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Tobias Wietelmann | DataTideHH

Data & Process Analytics → Analytics Engineering · Agentic AI & Automation (focus) · SQL · Python · Power BI · Microsoft Fabric · Hamburg

GitHub Pages deployment status Seeking a mandatory internship in Hamburg

Power BI: Data Visualization Microsoft Fabric: Data Platform SQL: Data Modelling Python: Data Analysis Hamburg, Germany

Portfolio overview · Personal website · LinkedIn

I am retraining as a Fachinformatiker für Daten- und Prozessanalyse (IHK, planned completion 12/2027), focusing on Analytics Engineering, Agentic AI & Automation, and the Microsoft Data Platform.

My primary interest is in connecting reliable data engineering with intelligent business process automation — turning data into actionable insights and building AI-assisted workflows that are transparent, testable and maintainable.

I work with SQL, Python, data modelling, APIs, data quality and reproducible analytical pipelines. My portfolio includes hands-on projects in data engineering and process analytics, alongside a Java / Spring AI project implementing governed tool calling, validated analytics data and deterministic testing. I am continuing to develop my skills in Power BI, Microsoft Fabric and AI integration.

I am currently seeking a mandatory internship in Hamburg as part of my IHK retraining, with a flexible start date. I am particularly interested in data engineering, business intelligence, process intelligence and AI-driven automation. My goal is to contribute to meaningful projects, gain practical industry experience and ideally develop a long-term professional relationship.

My background combines university studies in German Studies, American Studies, Journalism and Media & Communication Studies with extensive professional experience in B2B communications, corporate PR, marketing and project work in Germany and the United States.

From 2017 to 2020, I spent more than two years living and working professionally in the United States, primarily in New York City and Miami. I also hold U.S. permanent resident status (Green Card).

This combination of technical training, business experience and international perspective helps me understand requirements, communicate across disciplines and bridge the gap between technology, business processes and the people who rely on them.


Current Focus

Area Practical focus
Analytics Engineering SQL and Python transformations, relational data modelling, data contracts, reproducible pipelines and automated data-quality checks
Agentic AI & Automation Java / Spring AI, governed tool calling, schema validation, deterministic testing and evaluation workflows
Data & Process Intelligence Business KPIs, process performance, SLA analysis, bottleneck identification and evidence-based decision support
Microsoft Data Platform SQL Server and developing expertise in Power BI, semantic modelling, Microsoft Fabric and Azure
Python & API Integration pandas, REST APIs, data ingestion, validation and reproducible analytical workflows
Business & Stakeholder Communication Translating business requirements into technical solutions, communicating across teams and connecting analytics with business value
IT Foundations Linux, Cisco networking fundamentals, Java, automated testing, Git and CI/CD

Selected Portfolio Projects

External Portfolio Notebooks

Notebook Platform Focus
Delivery Delay KPI Analysis / GitHub mirror Kaggle / GitHub Python/pandas analysis of delivery performance, including KPI calculations, business-rule checks and data-quality validation. The notebook is also available on GitHub without a Kaggle login.

Data / BI / Microsoft-oriented projects

The first two projects form a connected workflow: a validated analytics pipeline provides the data foundation for a controlled Spring AI tool layer.

Project What it demonstrates
Service Operations AI Orchestration Java 21 / Spring AI application exposing SLA metrics from a validated, versioned analytics snapshot through two read-only tools. Includes schema validation, numerical reconciliation and a reproducible evaluation framework. Live LLM evaluation remains pending.
Fabric Service Operations Analytics Local Python/SQL pipeline processing synthetic service-operations data through Bronze/Silver/Gold Parquet layers and DuckDB. Includes SLA reporting, metric contracts and derived process-event analysis. Microsoft Fabric deployment and Power BI reporting remain planned.
Excel to SQL Data Workflows Explores how the same business questions can be answered in Excel, Power Query M, SQL Server T-SQL and Power BI DAX, including differences in calculation semantics and 19 automated tests.
Music Production Data Lab Relational model of music-production equipment and workflows, with Python/SQLite processing, SQL reporting and documented Power BI analysis, including DAX measures and a reviewed overview export.
Flask Country Data API World Bank data ingestion into SQLite, with source validation, transactional updates, versioned Flask endpoints, OpenAPI documentation and SQL-based data-quality checks.
SQL Server Docker Basics SQL Server lab covering relational constraints, star-schema modelling and automated verification in CI.
Hamburg District Data Basics Analysis of official Hamburg district data using pandas, documented dataset rules and validation checks, with a proposed Power BI reporting design.
Network Operations Data Lab Turns sanitized Cisco infrastructure records into a SQLite data model, SQL analysis views and quality reports. Demonstrates how operational IT data can support structured reporting.
Python Data Basics CSV processing workflow with input validation, traceable rejected records, KPI calculations and reporting tests.

Supporting IT foundations

Project What it demonstrates
Cisco Switching Lab Hands-on configuration and verification of a physical Cisco Catalyst 3560CX switch, including secure management, IOS maintenance, NTP and CCNA-related networking tasks.
IPv4 Subnet Calculator Multilang The same IPv4/CIDR calculation logic implemented in Java 21, C++20 and Python 3.12, using shared test cases to compare behaviour across languages.
Spring Boot Process API Basics Small Java 21 / Spring Boot REST API demonstrating request validation, layered application design and basic data persistence.
Remote Access Network Lab Tailscale and SSH lab documenting private remote access, trust boundaries, least-privilege access and device offboarding.

Each repository documents its implementation, tests and current scope.


Selected Writing


How I Work

I start with the business or operational question, then work backwards to the data, transformations and checks needed to answer it reliably.

  • Understand the problem: Identify the business process, the decision to be supported and the requirements behind it.
  • Define the metrics: Establish KPI definitions, data sources, assumptions and validation rules before building reports or automation.
  • Build and validate: Use SQL, Python and APIs to transform data, reconcile results and handle data-quality issues.
  • Apply AI where it adds value: Connect AI-assisted workflows to validated data through controlled tool access, explicit contracts and defined interpretation boundaries.
  • Test and document: Use automated tests, Git and CI to make implementations reproducible and reviewable.
  • Communicate the findings: Explain results, limitations and trade-offs in terms that technical and business stakeholders can understand.

AI-assisted development tools are part of my workflow. I review their output against source data, documented requirements and automated tests.


Certifications & Training

Area Credential / Focus Status
Data & Process Analysis Fachinformatiker für Daten- und Prozessanalyse (IHK) In retraining, planned completion 12/2027
Cloud Fundamentals Microsoft Azure Fundamentals (AZ-900) Exam scheduled 30 December 2026
Data Fundamentals Microsoft Azure Data Fundamentals (DP-900) Exam planned 02/2027
Business Intelligence Microsoft Power BI Data Analyst (PL-300) Exam planned 2027
Office Productivity Microsoft Office Specialist: Excel Associate – Microsoft 365 Apps (MO-210) Exam planned 2027
Networking Cisco CCNA (200-301) Exam scheduled 27 January 2027
Python PCEP – Certified Entry-Level Python Programmer Exam planned 12/2026
Python PCAP – Certified Associate Python Programmer Exam planned 01/2027
Linux Linux Essentials Completed
Agile / Scrum EXIN Agile Scrum Master Completed
Product Ownership EXIN Agile Product Owner Bridge Completed
Instructor Qualification AEVO / AdA – Ausbildereignungsprüfung (IHK / Hamburg Chamber of Commerce) Exam planned 07/2027
Communication IHK certificate in PR- und Medienarbeit Completed

Current Portfolio Direction

My next priorities are:

  • solid SQL models, transformations, data contracts and automated quality checks
  • a documented Power BI semantic model and report layer with unambiguous KPIs
  • reproducible Python pipelines, APIs and process-oriented analytics
  • practical Microsoft Fabric and Azure experience built on validated fundamentals
  • small, explainable agentic AI and automation workflows that keep business logic outside the model
  • documentation that makes implementation and limitations clear to employers and technical reviewers

Contact

Pinned Loading

  1. fabric-service-operations-analytics fabric-service-operations-analytics Public

    Tested local pipeline on deterministic synthetic service-operations data: Bronze/Silver/Gold Parquet, DuckDB SQL marts, metric contracts, SLA breach analysis. Microsoft Fabric and Power BI mapping …

    Python

  2. sql-server-docker-basics sql-server-docker-basics Public

    Reproducible SQL Server 2022 analytics lab with PowerShell provisioning, data integrity, a verified star schema and GitHub Actions.

    TSQL

  3. network-operations-data-lab network-operations-data-lab Public

    Public-safe operations analytics over a sanitized Cisco baseline using Python, SQLite, SQL validation views, automated tests and BI-style reporting.

    Python

  4. flask-country-data-api flask-country-data-api Public

    Reproducible World Bank data service with validated ingestion, constrained SQLite persistence, versioned Flask endpoints, SQL data-quality checks, OpenAPI 3.1 and cross-platform CI.

    Python

  5. music-production-data-lab music-production-data-lab Public

    Public-safe relational analytics model with SQLite, reproducible Python builds, SQL reporting views, automated data-quality checks and documented Power BI semantic modelling with DAX evidence.

    Python

  6. hamburg-district-data-basics hamburg-district-data-basics Public

    Tested Altona district-data workflow using official Hamburg data, pandas, dataset contracts, automated validation, descriptive analysis and Power BI design.

    Python