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DataTideHH/README.md

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Tobias Wietelmann | DataTideHH

IHK retraining program in Data and Process Analysis · Data/BI Analyst track · SQL · Power BI · Python · Microsoft Fabric/Azure · Hamburg

GitHub Pages deployment status Seeking a mandatory internship in Hamburg from September 2026

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

Portfolio overview · Personal website · LinkedIn

I am currently retraining as a Fachinformatiker für Daten- und Prozessanalyse (IHK, expected completion 06/2027) and building a practical Data/BI portfolio around SQL, Power BI, Python, data quality, process analysis and the Microsoft Data Stack.

Currently seeking a mandatory internship in Hamburg beginning on 9 September 2026, ideally in Data/BI, process analysis, reporting or a Microsoft-oriented data environment.

My target direction is Data/BI Analyst with a strong interest in Power BI, Microsoft Fabric, Azure fundamentals, relational data modelling, reporting workflows and process-oriented analytics.

My previous background in PR, communication, international business contexts, documentation and project-oriented stakeholder work helps me connect technical data work with business needs, decision-making and clear communication.


Current Focus

Area Practical focus
Data & BI Power BI, dashboards, KPIs, reporting logic, business questions
SQL & Data Modelling Relational databases, clean table structures, joins, aggregation, data quality
Python Data Workflows pandas, API data collection, CSV/JSON workflows, reproducible analysis
Microsoft Data Stack Power BI, Microsoft SQL Server, Microsoft Fabric perspective, Azure fundamentals
Process Analysis Turning operational processes into data models, reports and documented insights
Business Communication Translating technical findings into clear explanations for stakeholders
IT Foundations Linux fundamentals, Cisco/CCNA-oriented networking, Java and C++, API basics, automated testing and CI

Selected Portfolio Projects

External Portfolio Notebooks

Notebook Platform Focus
Delivery Delay KPI Analysis / GitHub mirror Kaggle / GitHub Public Python/pandas EDA with business-rule validation, data-quality checks and BI-style KPI aggregation. Kaggle login may be required for the Kaggle-rendered version.

Data / BI / Microsoft-oriented projects

Project What it demonstrates
sql-server-docker-basics Reproducible SQL Server 2022 analytics lab with PowerShell provisioning, enforced relational integrity, a verified star schema and end-to-end GitHub Actions
Network Operations Data Lab Infrastructure operations data lab connecting a verified Cisco baseline with Python, SQL, data quality and BI-style reporting
hamburg-district-data-basics Public Hamburg district data, exploratory analysis, data documentation and Power BI dashboard preparation
open-meteo-germany-weather-ranking Python/API workflow using Open-Meteo data, JSON processing, scoring logic, CSV output and tests
Flask Country Data API Reproducible World Bank ingestion workflow with source validation, constrained SQLite persistence, SQL data-quality checks, versioned Flask endpoints, OpenAPI documentation and cross-platform CI
Music Production Data Lab Public-safe relational data model with a reproducible Python/SQLite workflow, SQL reporting views, automated data-quality checks, and a documented Power BI semantic model with version-controlled DAX measures
python-data-basics Python 3.12 data environment for pandas, NumPy, Jupyter, API/JSON basics, OAuth2 notes and reproducible data workflows

Supporting IT foundations

Project What it demonstrates
Cisco Switching Lab Physical Catalyst 3560CX lab documenting secure management, IOS maintenance, NTP, verification and CCNA-oriented switching work
IPv4 Subnet Calculator Multilang One IPv4/CIDR specification implemented in Java 21, C++20 and Python 3.12 with shared contract cases and GitHub Actions
Spring Boot Process API Basics Small Java 21 / Spring Boot REST API with layered structure, validation and basic persistence for process-check data
remote-access-network-lab Public-safe Tailscale remote-access lab documenting native SSH over a private mesh VPN, least-privilege access modelling, temporary device trust, offboarding and CI-based safety checks

These repositories are intentionally focused and practical. They are not meant to simulate enterprise-scale systems, but to document a clear learning path, reproducible workflows and steadily growing professional competence.


Technical Learning Progression

Three supporting projects form a deliberate progression:

  1. Cisco Switching Lab — physical infrastructure, Cisco CLI, secure administration and IPv4/CCNA context.
  2. IPv4 Subnet Calculator Multilang — one bounded domain problem implemented in three languages, with explicit validation, shared domain test cases and CI.
  3. Spring Boot Process API Basics — progression from compact Java logic toward a layered HTTP API with validation and persistence.

This is supporting breadth around the main Data/BI direction, not a claim of separate network-engineering or backend specialization.


How I Work

I focus on small, understandable and documented Data/BI workflows:

  • define the business or process question first
  • document data sources and assumptions
  • keep data models explainable
  • validate data before interpretation
  • use readable SQL and Python
  • prefer reproducible steps over one-off manual work
  • connect data work with business context and stakeholder needs
  • explain results for business and technical audiences
  • use AI-assisted tools responsibly as support, not as a substitute for understanding

Certifications & Training

Area Credential / Focus Status
Data & Process Analysis Fachinformatiker für Daten- und Prozessanalyse (IHK) In retraining, completion 06/2027
Cloud Fundamentals Microsoft Azure Fundamentals (AZ-900) Exam scheduled 29 July 2026
Data Fundamentals Microsoft Azure Data Fundamentals (DP-900) Exam planned 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 8 September 2026
Python PCEP – Certified Entry-Level Python Programmer Exam scheduled 08/2026
Python PCAP – Certified Associate Python Programmer Exam scheduled 08/2026
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 01/2027
Communication IHK certificate in PR- und Medienarbeit Completed

Current Portfolio Direction

I am currently strengthening this portfolio toward:

  • SQL-based data modelling and reporting queries
  • Power BI dashboards with clear KPIs and clean data models
  • Python-based data collection, cleaning and exploratory analysis
  • Microsoft Fabric and Azure fundamentals as the next platform layer
  • process-oriented analytics for real business questions
  • clear documentation for recruiters, internship providers and technical reviewers
  • stronger links between technical implementation, business interpretation and communication

Contact

Pinned Loading

  1. 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

  2. network-operations-data-lab network-operations-data-lab Public

    Network operations data lab combining Cisco networking, Python, SQL and BI-style reporting.

    Python

  3. hamburg-district-data-basics hamburg-district-data-basics Public

    Altona-focused Hamburg district data analysis with Python, pandas, public data and Power BI preparation.

    Python

  4. music-production-data-lab music-production-data-lab Public

    Public-safe data model with SQLite schema, SQL queries, Python build workflow, data-quality checks and Power BI overview.

    Python

  5. open-meteo-germany-weather-ranking open-meteo-germany-weather-ranking Public

    Python/API data workflow using Open-Meteo data, pandas, scoring logic, CSV output and BI-style reporting preparation.

    Python

  6. cisco-switching-lab cisco-switching-lab Public

    Physical Cisco Catalyst 3560CX lab documenting IOS maintenance, secure management, VLAN design and CCNA-oriented switching practice.