About me

Hello! I am Petri Lehtinen, a Finnish software developer who mostly hacks in Python, Javascript and C. In the Internet, I'm sometimes also known as “akheron” or “akhern”. To contact me, drop an email to my first name at this domain (address obfuscated to avoid spam).

I have a few projects and I also used to update my blog every now and then. Less so nowadays.

I use Arch Linux, Emacs and Git.

My PGP public key is available here. Its fingerprint is B5D6 953E 6D50 59ED 7ADA 0F2F D365 7D24 D058 434C. I use the key mainly to sign tarballs that I create for the releases of my projects.

In the past, releases were signed with my old key. It's still available here.

Me around the web:

• GitHub
• Twitter
• Keybase

Projects

All the projects here are free open source software.

Projects I've started and am the main author of:

• Jansson — C library for working with JSON data
• Multipy — Install multiple Python versions locally
• Sala — Simple encrypted password storage
• Sinap — IRC bot built on top of asyncio
• Stango — Static website generator for Python programmers

Python is one of my favourite programming languages, and I used to be one of its core developers.

Some other significant projects I've contributed to, more or less:

• Linux — The most awesome operating system kernel on Earth
• ElasticSearch — A distributed real-time search and analytics engine
• OpenEmbedded — Build framework for embedded Linux
• Tornado — Scalable, non-blocking web server and tools
• U-Boot — The universal bootloader
• Ubuntu — My old favourite Linux distro

Publications

I worked for the Department of Software Systems in Tampere University of Technology for a few years. This is a list of research papers I worked on during that period:

• A. Valmari, P. Lehtinen. Efficient Minimization of DFAs with Partial Transition Functions. 25th International Symposium on Theoretical Aspects of Computer Science (STACS). Bordeaux, France, February 21-23, 2008. At the time of publication, this paper presented the fastest known minimization algorithm for Deterministic Finite Automata (and AFAIK, it still does). The paper is available online.
• T. Elomaa, P. Lehtinen. Maintaining Optimal Multi-way Splits for Numerical Attributes in Data Streams. 12th Pacific Asia Conference on Knowledge Discovery and Data Mining (PAKDD). Osaka, Japan, May 20-23, 2008.
• T. Elomaa, P. Lehtinen, M. Saarela. Obtaining Low Arity Discretizations from Online Data Streams. 17th International Symposium on Methodologies for Intelligent Systems (ISMIS). Toronto, Canada, May 20-23, 2008.

In real life...

I have a wife and four kids, and that's why I don't have much time to work on my hobby projects. And, to make things clear, I'm completely happy with this situation :-)