The Client
Denner AG is the leading food discounter in Switzerland with an annual revenue of 3.9 billion CHF and over 870 retail stores.
The Challenge
Ensuring absolutely stable, high-performance, and error-free dbt pipelines within a complex Data Mesh and Medallion architecture inside the Microsoft Fabric ecosystem. Elimination of critical performance bottlenecks (e.g., 'Resource Limit Exceeded' errors and unpredictable deadlocks).
Our Solution
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Analytics Engineering
Assuming full architectural responsibility for over 1,200 dbt models. Systematic refactoring of complex SQL transformation logic.
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Process Automation
Design and development of an innovative, reusable Python library (lib_pegasus) for the complete automation of recurring data engineering tasks.
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Observability
Introduction of seamless and context-rich logging mechanisms as well as dbt tests for maximum transparency and improved failure diagnosis in production.
Results
Measurable Results
- Maintainability
- Substantial increase in development velocity across the entire internal team through standard libraries.
- Security & Stability
- Complete stabilization of mission-critical ETL processes and elimination of all runtime-critical performance bottlenecks under massive data volumes.