I'm David Llewellyn-Jones and this is my homepage. I'm a software engineer at Jolla, who's also interested in programming, security, privacy and graphics. I occasionally crave adventure and a good thunderstorm. You might be interested in my software, my research or my random musings.

Want to know more about me? Here's a personality sketch written by a psychologist when I was in school.

“David is of high intelligence, although lacking in true creativity. He has a need for order and clarity, and for neat and tidy systems in which every detail finds its appropriate place. His writing is rather dull and mechanical, occasionally enlivened by somewhat corny puns and by flashes of imagination of the sci-fi type. He has a strong drive for competence. He seems to have little feel and little sympathy for other people and does not enjoy interacting with others. Self-centered, he nonetheless has a deep moral sense.”

Wow. Harsh. But disturbingly accurate.

Control panel:
Site style Disable background shader

RSS feed Constantia server Deviant Art Shapeways LinkedIn Twitter Launchpad SourceForge GitLab GitHub PGP Public Key Email



4 Apr 2020 : Waste data dump #
I was expecting a terrible result for this fortnight's waste output, given my increased coffee, snack and food consumption working from home. And my compost really has gone up a lot again (even more of those coffee granuals), but happily a reduction in paper waste makes up for it. My daily average this fortnight was 133g/day, slightly down on last week, which I'm pretty proud of.
21 Mar 2020 : Waste data dump #
More waste data on the waste page. The new data covers a fortnight, which is a good sign (a longer gap usually means less waste). More than a week of that I spent working from home, which I'd expect to cause an increase in waste output. That's partly true: my compost output is higher because I've been throwing away more used coffee granules! But a decrease in glass (to zero!) has compensated and my overall output of 139g/day is well below my 300g/day target. It might be hard to keep this up if I'm spending more time at home. Time will tell.
17 Mar 2020 : The site has moved from IIS to LAMP #
Today the site finished its 80-day journey travelling from IIS to Linux. Hopefully there won't be too many visible changes to the site, apart from the fact that everything is now TLS-secured. There's a sort blog post about the move on my blog.
8 Mar 2020 : Waste data dump #
Last weekend I was in Helsinki and this last week has seen unusual events at work keeping me away from home, so my waste output is low again. So low that I skipped a week of going to the bins. Overall, my daily average for the last fortnight has been 146g per day, less than half my 300g target, which is great. That's pretty similar to the week before, but with an increase in glass balanced out by a decrease in compostables. That's not a comparable switch, but probably a one-off given that I finally polished off the last bottle intended for Christmas consumption! That sets my daily average so far for 2020 at 233g of waste per day.
22 Feb 2020 : Waste data dump #
More waste data is up on my waste page. I averaged 159g per day this week, pretty similar to the week before (more compost balanced by less paper). This is good by my historical standards and still well below my 300g target. I've been trying quite hard, so it's nice it seems to be working, now I just have to keep this up!