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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Introducing polyglot - A Rust/Wasm SQL transpilation library

What if you could take a SQL query written for PostgreSQL and transpile it to BigQuery, Snowflake, or any of 33 database dialects — entirely in the browser, with no server round-trip? That's what polyglot does. SQL dialect fragmentation is a real pro...

February 14, 2026

6 min read

Rust SQL transpiler

Custom DuckDB Wasm builds for Cloudflare Workers

What if you could run full SQL queries, including JOINs, aggregations, and even remote Parquet file reads, directly inside a Cloudflare Worker? No database server, no connection pool, no cold-start latency from external services. Just DuckDB, compile...

January 27, 2026

8 min read

duckDB cloudflare-worker wasm

Using Iceberg Catalogs in the Browser with DuckDB-Wasm

With recent updates of DuckDB itself, DuckDB-Wasm and the Iceberg extension it is now possible to query Iceberg catalog directly from the browser, with no backends. involved. Example clients that work: SQL Workbench SQL Workbench Embedded DuckDB T...

December 16, 2025

5 min read

duckDB iceberg wasm

TypeScript scripts as DuckDB Table Functions

What if you could query any REST API, GraphQL endpoint, or web page directly from DuckDB using SQL? No ETL pipelines, no intermediate files, no complex setup - just write a TypeScript script and use it as a table function. In this post, I'll show you...

December 10, 2025

7 min read

duckDB TypeScript arrow

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