Welcome

Father - Ultrarunner - Builder

I'm a proud father and an ultrarunner, with an extensive background in catering & events. I'm enthusiastic about programming, AI, Linux, investing and art.

This site is hosted and developed by me, mostly by AI engineering nowdays.

Currently working as a full stack developer and coach at Sitowise and finishing a master's degree in AI & Data Engineering.

Kalle Tolonen mugshot

CONTACT & REFS

Recent Articles

Gandi.net DNS-propagation issue resolved

2026-09-08

I needed to change email backend to Resend. I could not get it to work, even as I diligently pasted their console output to Gandi's DNS-records.

Agents as productivity leverage (24 tested PR's to production during naptimes)

2026-09-08

Agents, and especially great harnesses, like Cursor, have taken the drudgery out of coding. I like solving problems, and the level of abstraction for problems does not matter. Some programmers struggle with the change, since a big part of their identity has been chiseling out the code.

At the same time, I'm grateful for the fact that I can code, so I can appreciate the tools we now have. It's not unlike music - you can appreciate it more, if you understand the complexity and skills required to produce it.

FFMPEG to the rescue, again

2026-09-07

LinkedIn is going to be one of my direct integrations, if it's possible, so that I can write an article once and publish it on my own platform and do external distribution. Who has a non-svg logo available in 2026? I don't so I need to fix it.

Lets dictate

2026-09-07

Why should one bother with writing text manually when you can just dictate stuff?

Harry Potter moment

2026-09-07

Went shopping for bananas, shipped 3 new features on the 30 min walk.

Public Refs

kalletolonen.com reference photo

Maritime

Fullstack (Rust, Python, PostgreSQL, Svelte). GIS-data mining, analytics and visualizations. (2026)

  • Live AIS vessel tracking for the Baltic Sea and coastal Finland
  • Tap a ship for metadata, speed/heading, and its recent track on the map
  • Forms automated GIS-based analysis of vessel data
Superlatiivit.com reference photo

Superlatiivit.com

Data mining & processing (2024)

  • Mines Finnish Wikipedia for superlatives and handles suffix exceptions
  • Publishes three randomized adjectives each day
paiste.fi reference photo

Paiste.fi

Front-End with Bootstrap (2021)

deftle reference photo

Deftle

Python Wordle clone with word definitions (2022)

  • Wordle-style guessing with hand-built word data and logic
  • Shows the definition right after a successful guess