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Hannes Mühleisen

PROFILE

Hannes Mühleisen

Hannes Muehleisen developed and maintained database extensions and deployment workflows for the duckdb/community-extensions and duckdb-odbc repositories. He released the Avro extension for DuckDB, providing metadata, documentation, and usage examples, and ensured ongoing compatibility through version management and platform-specific adjustments. Hannes stabilized cross-platform CI/CD pipelines using Docker and GitHub Actions, improving build reliability across Linux, macOS, and ARM architectures. He automated release artifact publishing with Python scripting and enhanced deployment workflows by refining AWS S3 integration. His work demonstrated depth in C++, CI/CD, and configuration management, resulting in robust, maintainable extension releases and streamlined deployment processes for downstream users.

Overall Statistics

Feature vs Bugs

86%Features

Repository Contributions

28Total
Bugs
1
Commits
28
Features
6
Lines of code
346
Activity Months3

Work History

September 2025

3 Commits • 2 Features

Sep 1, 2025

September 2025 performance summary for duckdb/community-extensions. This month focused on reliability and maintenance of deployment workflows and extension quality. Key outcomes include stabilizing deployment and archiving processes by updating GitHub Actions to use AWS_ENDPOINT_URL instead of AWS_DEFAULT_REGION and by specifying an explicit archiving endpoint to target S3-compatible storage, reducing misconfigurations and deployment failures. In addition, the quack extension was upgraded to version 0.0.2 as a non-breaking maintenance release, with updates reflected in the description file. These efforts improve automation reliability, storage targeting accuracy, and overall extension stability for downstream users.

January 2025

14 Commits • 3 Features

Jan 1, 2025

January 2025 monthly summary for DuckDB community-extensions and duckdb-odbc focused on dependency hygiene, cross-platform CI reliability, and streamlined release processes. Delivered critical feature and stability work across two repos, enabling faster, safer releases and broader platform support.

December 2024

11 Commits • 1 Features

Dec 1, 2024

Monthly summary for 2024-12: Avro extension for DuckDB released in duckdb/community-extensions with initial feature delivery, documentation, usage examples, and metadata. Ongoing maintenance includes platform exclusion for WebAssembly, reference hash updates, and version bumps to maintain compatibility and functionality.

Activity

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Quality Metrics

Correctness92.2%
Maintainability93.6%
Architecture91.4%
Performance88.6%
AI Usage20.0%

Skills & Technologies

Programming Languages

BashC++PythonShellYAML

Technical Skills

API DevelopmentAPI IntegrationAWS S3Build AutomationBuild ManagementBuild System ConfigurationBuild SystemsC++CI/CDCloud DeploymentConfiguration ManagementCross-compilationData FormatsDatabase ExtensionsDocker

Repositories Contributed To

2 repos

Overview of all repositories you've contributed to across your timeline

duckdb/community-extensions

Dec 2024 Sep 2025
3 Months active

Languages Used

YAMLC++

Technical Skills

Build ManagementBuild System ConfigurationConfiguration ManagementData FormatsDatabase ExtensionsVersion Control

duckdb/duckdb-odbc

Jan 2025 Jan 2025
1 Month active

Languages Used

BashC++PythonShellYAML

Technical Skills

API DevelopmentAPI IntegrationAWS S3Build AutomationBuild SystemsC++

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