Hi, I'm Tobi

Technical Product Owner by day, OSS software engineer by night. I like cloud computing, such as AWS and Cloudflare, DuckDB, SQL, modern data stacks, GIS tools and some sprinkles of web development.

I'm leveraging AI tools like Claude Code, Cursor and Copilot to build useful things with a product mindset, fast.

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Recent Blog Posts

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Use your favorite AI tool to read the lastest AWS News

You can use the unofficial AWS News MCP Server, which combines the news articles, blog posts and updates of more than 40 different AWS Newsfeeds to a single source. Connecting to the AWS News MCP Server You can use different protocols to access it: ...

October 14, 2025

4 min read

AWS mcp AI

Using Amazon SageMaker Lakehouse with DuckDB

Preconditions To use the Amazon SageMaker Lakehouse with DuckDB, you first have to create a S3 Table bucket, a namespace and an actual S3 Table. All those steps are described in my other blog post “Query S3 Tables with DuckDB”, so please make sure yo...

June 8, 2025

5 min read

sagemaker duckDB glue

Welcome to the age of $10/month Lakehouses

Recap: Data Warehouses, Data Lakes, Lakehouses? As a short recap, what do these mean, and how are they differentiated? Modern Data Warehouses, like Amazon Redshift, Google BigQuery, and Snowflake, offer fast, SQL-optimized performance for structured ...

May 30, 2025

18 min read

lakehouse Data-lake duckDB

Using DuckDB databases as lightweight Data Lake access layer

Data Lakes come in a broad variety and lots of different flavors. AWS, Azure, Google Cloud, Snowflake, DataBricks, etc. they all have their specialties, strong and weak sides. Common among them is that the most, if not all, of them use Object Storage...

May 17, 2025

15 min read

duckDB Data-lake analytics

Handling GTFS data with DuckDB

The General Transit Feed Specification (GTFS) is a standardized, open data format for public transportation schedules and geographic information. In practice, a GTFS feed is simply a ZIP archive of text (CSV) tables - such as stops.txt, routes.txt, a...

May 16, 2025

8 min read

gtfs duckDB data-engineering

Cost-efficient event ingestion into Iceberg S3 Tables on AWS

Amazon S3 Tables was launched on December 3rd 2024, and provides you “storage that is optimized for tabular data such as daily purchase transactions, streaming sensor data, and ad impressions in Apache Iceberg format”. While S3 Tables can be queried ...

April 10, 2025

13 min read

apache iceberg AWS cloudflare