Jonasfj.dk/Blog
A blog by Jonas Finnemann Jensen


January 1, 2025
Hello Oliver
Filed under: English,Personal by jonasfj at 11:21 pm

Say hello to Oliver, the stork dropped him off on the 13 December 2024. It was bit of a hard landing, but as first time parents we didn’t expect it to be easy.

So far he is extremely cute, especially when he sleeps 😀



June 23, 2024
3D printing a worthy taskmaster trophy
Filed under: 3D Print,English,Personal by jonasfj at 5:16 pm

For New Years we had a couple of friends over for a small celebration. Just a causal dinner party, a tiny and amount of fireworks and some champagne. To pass the time waiting for midnight we broke out a board game.
My friend had a board game based on the TV show TaskMaster (or “Stor Mester” as the Danish edition is called). Fundamentally, the game is simple: there is a TaskMaster, the other players draft tasks and the TaskMaster ranks players based on how well they do the tasks.

My friend served as TaskMaster, and through ingenuity (if I may say so myself) and plausibly a bit of luck: I somehow won! In the TV show there is a trophy, which is a golden sculpture of the TaskMasters head. In the board game there is also a trophy, however it’s just a tiny cardboard cutout of the TV show trophy. The rules of the board game states that the winner should keep the trophy until next time the game is played. However, as they live a few hours away, and they might be playing the board game other people next time, this seemed a bit impractical. So they brought the game, including the paper trophy, home.

Naturally, I felt that I was owed a worthy trophy! So I found a picture of my friend, and paid an artist on fiverr.com to create a 3D rendering of his head. With a bit of scaling and a few tweaks I was able to slice the head and print it on my 3D printer.
I painted the printed head with primer and gold spray paint. Then I designed my own stand with appropriate inscription in Tinkercad, printed and glued the two parts together. Finally, a trophy with winning!

Given all the work I had for through getting the design for this trophy ready, I ended up printing 7 trophies all together. I gave myself one, which I deem to have won fair and square! The rest I gifted to my friend, such that he can give out a decent trophy next time he serves as TaskMaster. After all, who wouldn’t want to have a golden bust of my friend’s head!



November 24, 2023
Traveling New Zealand
Filed under: English,Personal by jonasfj at 11:16 pm

Having traveled 4270 km through most of New Zealand by campervan — we are getting ready for a long flight home.

We landed in Auckland about 4 weeks ago. It took a little while to adjust to gravity being upside down and driving on the left side of the road. But with earth being above us the whole gravity issue wasn’t much of an issue. Driving on the wrong side of the road took some getting used to, but we’ve only passed an oncoming car on the right twice — and one of those oncoming cars were definitely turists driving on the right (well, “wrong”) side of the road!

On the North Island we dug for hot springs on hot water beach, river rafted the Tongariro river, snug into the secret hot tub spot (for a hot tub in the forest), and hiked the Tongariro alpine crossing. We did initially have to reschedule the Tongariro alpine crossing due to weather, which gave us time to do a few other hikes and a visit to waitomo caves to spot glow worms.

In the end we had fantastic weather on the Tongariro alpine crossing, partly because we got up very early — which wasn’t much of a problem as there is little to do in a campervan after sun down (which kept our jetlag going for the first 2 weeks).

On the South Island we finally got a proper dose of sunshine in Abel Tasman. Here we could open the campervan doors towards the ocean and enjoy the golden beaches — pretty much without getting out of bed — this also made getting out of bed rather difficult!

When we finally did make it out of bed the sunshine had turned to light rain, and we had the pleasure of hiking around for a day, spending the following day kayaking off the coast passing a few seals and spotting a few lively dolphins from the water taxi!

Heading on we passed pancake rocks before hitting Franz Josef glacier — unfortunately our helihike got cancelled due to weather, so we had to settle for a short scenic helicopter flight without landing or exploring the glacier.

On our way from Franz Josef we made an unscheduled stop at Puzzle World and walked 2.5 km in a maze we thought would only two “smart” adults like us 10 minutes to complete. Arriving in Queenstown we started to take things a bit “slow”, by jetboating or just relaxing a bit with a movie in the campervan. Used the better part of a day driving to Milford Sound, where we spent two hours top side on a cruise enjoying the fantastic waterfalls. It was two hours spent in partial rain and damp weather, so when we got back to the campervan we snuggled up under blankets in the back and had the best nap ever, before heading back to Queenstown.

After a bit of civilization in Queenstown we headed to Mount Cook where we did a few hikes, enjoying the view after going up a 2200 step stairway to Searly Tarns. A view that was greatly enhanced by some homemade tuna salad 🙂

Finally, we’re now sitting in Christchurch Airport waiting to head home — having enjoyed a few well deserved “slow” days in Christchurch: just relaxing in the Adrenaline Forest or taking a private surfing lesson (along the only part of the beach covered in clouds).

All in all we’ve greatly enjoyed our journey through New Zealand!



April 5, 2023
Just Married
Filed under: English,Personal by jonasfj at 10:28 pm

We got married in Tranbjerg Church. Originally built towards the end of 12th century the Church is fairly small, which made it easy to fill the church to the brim. The ceremony was quite short, but that didn’t prevent it from feeling like an eternity.

Cover photo by Claude David; Adopted by Jonas F. Jensen; Creative Commons BY-SA 4.0

We had a cozy wedding reception and dinner, mostly close friends and family (which easily grew the guest list past 70 entries). For music we had kortlang.dk play, and I’d strongly recommend them, they had a wonderful vibe. In some sense, doing a classic wedding party makes you feel old, but tradition is not without merit.

Instead of doing a boring speech, at the dinner, my siblings opted to do a fun bid. Supposedly, they had reached out the HR department at work, who kindly informed them that plans were in motion to replace all employees with chat bots. Naturally, the HR department had shared a beta version of chat bot meant to replaced me. So my siblings fired up a presentation and proceeded to pretend to test the chat bot. Checking to see if it would give answers similar to what they’d expect from me.

Apparently, when prompted about bread slice size and topping size mismatches, their “chat bot” proceeded to propose that one 3D prints a mold to cut bread in such sizes that it fits the topping perfectly. To which my siblings had to agree, that this was in line with what I would do. They had a bunch of other fun prompts for their fake “chat bot”.

All in all it was a very fun (and contemporary) story vehicle. I’ll freely admit that when topping doesn’t neatly fit a slice of bread it is a problem. I have yet to bake round ryebread that would fit a salami slice. But I wouldn’t put it past me to do something like that. Ofcourse, it would be much easier to just 3D print a mold matching the salami slice and use to stamp out a matching slice of bread.

In any case, my siblings found it necessary to gift me a 3D printer. So I’ll guess I’ll have to 3D print a mold too. Maybe the cutoff can be used for ĂžllebrĂžd 😀



October 31, 2021
Bought a Home
Filed under: English,Personal by jonasfj at 9:19 pm

This summer Dorrit and I bought our first house. The house is 165mÂČ plus a 50mÂČ built-in garage suitable for all sorts of hobbies, workout equipment, parties, etc. I don’t imagine we’ll use the garage for parking, the garage is much to nice for that — or rather I care too little for cars!

We got the keys October 1st and moved into the garage, while we got the house ready. There weren’t much to get ready, mostly just hanging up lights, giving the walls a fresh coat of paint, cleaning the insides of cabinets, finding old snacks hidden behind drawers and such. I’m sure there’ll also be old biscuits behind one of the drawers when we move out, it’s not exactly a place you look often 🙂

We owe huge credits to friends and family for helping out with moving and painting the interior. Turns out that when 10 people show up, a lot can get done in a days work.

So far the life as homeowner is pretty sweet. Living two adults in a one bedroom apartment during covid-19 lockdowns did get a little cramped — especially when both of us were working from home. Having a more space certainly isn’t overrated.



December 30, 2018
From Mozilla, San Francisco to Google, Aarhus Denmark
Filed under: Computer,English,Google,Personal by jonasfj at 5:47 pm

Standing at the end of 2018 and having written no blog posts all year, I figure now would be a good time to give a brief personal note on what changed in my life in 2018.

Having realized that I didn’t want to make my life in America permanent, I relocated from San Francisco to Aarhus (Denmark) in April. I had a lot of great experiences in the Bay Area, both personally and professionsally. But I also missed friends and family, so moving back wasn’t a hard decision. In some ways it’s surprising it took this long. I like to joke that Trump made me want to move back to Denmark, but truth is that a run in with one of the many homeless people in San Francisco is enough to make me long for the welfare state I grew up in.

Leaving Mozilla, however, was not an easy decision — I wish to stress that I left Mozilla after relocating (not because of my decision to relocate). After 5 years at Mozilla I needed new challenges. I spent almost all my time at Mozilla building TaskCluster, the task-graph execution framework powering continuous integration and release processes at Mozilla. Having been part of this project from the very start and allowed to take major design decisions, it was hard to leave this project behind. Yet, I have absolute confidence that my co-workers will be able to take this project into the future.

In August I joined the Dart team at Google in Aarhus, to work on Dart related matters. Not being able to talk about everything I do is new to me, but as things become public I might try to write a technical note from time to time. Most of my work will still be open source, and if you stalk me on GitHub you’ll already have seen me involved in the package hosting service dart. So far working at Google have been a joy — the food is pretty good!

This was also the year where I finally got an apartment with more than one room! And I bought real non-IKEA furniture like a grown-up would do, hehe. I also bought my first car (Blue, Toyota Yaris H2), and slowly getting good at not driving into bus-only lanes! Between my employment at Mozilla and Google, I spent a week of my summer attending YMCA-YWCA children summer camp again — lots of fun, pirate boat sailing and water fights. Overall I’m greatly enjoying the changes I’ve made, and looking forward to 2019.



July 3, 2010
Hjemme fra bĂžrnesommerlejr 2010
Filed under: Dansk,Personal by jonasfj at 8:46 am

SĂ„ har jeg endeligt fĂ„et sovet ud efter endnu en hĂ„rd og fantastisk bĂžrnesommerlejr… Den sidste uge har jeg vĂŠret leder for nogle 5-6 klasses piger pĂ„ Kfum-Kfuk distrikt Midtjyllands bĂžrnesommerlejr 2010. Og igen var der tale om en fed lejr masser af sjov, vand og sol (mĂ„ske i virkeligheden for meget for en nĂžrd som mig). I Ă„r mĂ„tte jeg sĂ„ ogsĂ„ se bĂžrn der var mine unger for 3 Ă„r siden komme med som ungledere, den slags er faktisk lidt foruroligende. Men efter grundig opgĂžrelse, for ja jeg kunne faktisk ikke huske det, sĂ„ har jeg vĂŠret med pĂ„ bĂžrnesommerlejr som leder 5 (+1 en gang som ungleder). NĂ„r, men jeg har ikke tid til at reflektere over at blive gammel, det kan jeg gĂžre nĂ„r jeg bliver pensioneret :).

Temaet for Ärets bÞrnesommerlejr var cirkus. Dette skulle selvfÞlgelige reflekteres i hiken, hvor vi bl.a. havde kaplÞb i klovne sko, flÞdeskums kast (pÄ leder) og tiger tÊmning som poster. Anders og jeg var posteret ved tiger tÊmnings posten, her skiftedes vi til at kravle rundt, skÊrer tÊnder og skrige os hÊse, mens ungerne skulle pacificeres os med pakketape. Nedenunder ses, en farlig tiger (mig), indfanget af 8 friske tiger tÊmnings aspiranter :).

Til trods for et par drĂ„ber regn forlĂžb hiken helt godt… Vi overlevede alle sammen, selvom vi savnede vores har-alt-mulig-i-traileren-mand Jens Christian, det forlyder dog at han kommer igen nĂŠste Ă„r :). Udover et par drĂ„ber pĂ„ hiken fik vi ikke noget regn pĂ„ bĂžrnesommerlejr. Men det betyder jo ikke at man kan forblive tĂžr, nĂ„r ungerne fĂ„r lov at give en leder vand til lejrbĂ„l hvis de har det pĂŠneste telt. SĂ„ledes gik det altsĂ„ til at jeg ikke kunne komme til lejrbĂ„l uden at blive vĂ„d…



January 31, 2009
Ny laptop, Lenovo Thinkpad R500
Filed under: Computer,Dansk,Personal by jonasfj at 3:11 pm

SĂ„ blev det endelig tid til at fĂ„ en ny bĂŠrbar, jeg har lĂŠnge gĂ„et og truet min Toshiba med at den skulle ud… Til sidst holdt batteriet ogsĂ„ op med at virke, men efter 3,5 Ă„r som min primĂŠre desktop mĂ„ man ogsĂ„ indrĂžmme at det er godt klaret at den overhovedet er i live endnu…

Derfor har jeg fornyeligt anskaffet mig en Lenovo Thinkpad R500, med 2 GiB ram, 250GB harddisk, dualcore 2 processor og 1600×1050 i skĂŠrmoplĂžsning, sidste nĂŠvnte skal man vende sig lidt til… Verden er jo blevet nĂŠsten 4 gange sĂ„ stor 🙂

Da jeg fik den, havde den en fin Windows Xp installation der fyldte hele harddisken og havde de omkring 70 fuldstĂŠndigt totalt uundvĂŠrlige baggrundsprocessor kĂžrerende. Jeg formoder at ironien er tydeligt, det tog mig i hvertfald ikke ret langtid at fĂ„ lukke ned for det skidt. SĂ„ prĂžvede jeg om jeg kunne fĂ„ system gendannelses partitionen til at lave partitioner og gendanne, men fandt ikke uden videre ud af hvordan man skulle gĂžre det… Hvis man da kan det…

Det lykkedes mig dog, uden stĂžrrer problemer at installere Ubuntu 8.10 pĂ„ PC ved at formatere fuldstĂŠndigt. Jeg var dog sĂ„ betĂŠnksom at efterlade en lidt plads til en Windows partition, hvilket jeg nu har installeret fra VirtualBox 🙂 Jeg har ikke prĂžvet at boote den uden for VirtualBox, og tvivler ogsĂ„ lidt pĂ„ at den vil samarbejde…



August 31, 2008
SĂ„ er jeg flyttet hjemmefra

Filed under: Dansk,Personal by jonasfj at 10:14 am

SĂ„ er sommeren ved at vĂŠre slut og studiestart lige om hjĂžrnet. I gĂ„r flyttede jeg sĂ„ til Aalborg, og nu er jeg sĂ„ altsĂ„ flyttet hjemmefra… Som siturationen er har jeg 3 kg kylling, 22 pĂžlser, en pose boller, og en fryse pizza i fryseren; derudover har jeg 4 skriver rugbrĂžd og pose havregryn… sĂ„ med alt held gĂ„r der i hvert fald mindst en uge inden jeg flytter hjem igen… 🙂

NyLejlighed
Ellers gĂ„r det faktisk fint, jeg har fĂ„et indrettet mig praktisk i min 34mÂČ lejlighed og i gĂ„r fik jeg, med hjĂŠlp fra mine forĂŠldre, kĂžbt det meste af alle de mĂŠrkelige smĂ„ ting man gĂ„r og mangler. F.eks. bradepande, karry, tĂžrrestativ og meget andet… samt 2, pĂ„ anden dagen, stadigt levende potteplanter…



July 8, 2008
BĂžllebob – BĂžrnesommelejr 2008
Filed under: Dansk,Personal by jonasfj at 9:54 pm

SĂ„ blev det mandag og jeg har nĂŠsten fĂ„et sovet ud fra sidste uge bĂžrnesommerlejr. Jeg var nemlig med pĂ„ kfum-kfuk distrikt midtjyllands bĂžrnesommerlejr igen, faktisk for fjerde Ă„r i trĂŠk – et tal der begynder at virke skrĂŠmmende. Vi havde en fed lejr, og man mĂ„ nok tilstĂ„ at jeg var en smule trĂŠt da jeg kom hjem…

Jeg var i Ă„r igen, leder for nogle 5-6 klasses unger, vi startede i Ă„r ud med et handicap lĂžb, sĂ„dan for at ryste ungerne sammen. LĂžbet gik ud pĂ„ at vi delte ungerne ind i 4 hold og derefter pĂ„fĂžrte dem nogle fysiske handicaps med malertape til pigerne, pakketape til drengene og gaffatape til dem der snyder 🙂 Efter opdeling og pĂ„fĂžrelse af handicaps skulle de ud til 4 poster. FĂžrste post var et forhindringslĂžb, opsat i en gymnastik sal, sĂ„ forholdende var jo ideelle til den slags. En anden post gik ud pĂ„ at hoppe i sjip, derudover havde vi ogsĂ„ en post hvor holdet skulle folde en presning sammen mens de stod oven pĂ„ den. Sidst men ikke mindst var der video maraton, her havde jeg nogle video bĂ„nd, som de skulle rulle ud, mens de gik maraton oven pĂ„ dem. Det vidste sig at vĂŠre en ret hurtig mĂ„de at fĂ„ set et helt bĂ„nd pĂ„. Det kommer vel ikke som nogen overraskelse (pas pĂ„, sort humor) at “My Little Pony” bĂ„ndet vandt stort. Dette resulterede i at jeg kom til at fortĂŠlle en godnat historie om My Little Pony, der involverede bĂ„de den specielle relativitets teori og newtons tredje lov. Noget der vidste sig at vĂŠre en meget underholdende oplevelse……

Senere var vi pĂ„ hike, det startede for mit vedkommende ved at jeg faldt i sĂžvn i en grĂžft pĂ„ en post pĂ„ vej til overnatningen, der sov jeg sĂ„ under middags solen og blev godt solbrĂŠndt. Ved min post legede vi kims leg med kikkert, hvilket faktisk var vĂŠldigt underholdende. Den mĂŠrkeligste post i Ă„r, som dog ikke var nĂŠr sĂ„ sej som den vi havde sidste Ă„r, gik ud pĂ„ at ungerne skulle lĂžbe stafet og spise flĂždeboller undervejs. FlĂždeboller os ledere havde brugt natten forinden til at fylde med majonĂŠse. Vi serverede selvfĂžlge de overskydende flĂždeboller sammen med kĂžkken tanternes lagkage til lederhygge den efterfĂžlgende aften; hvilket bestemt var hele besvĂŠret med at fylde flĂždebollerne vĂŠrd! Sidst men ikke mindst, skal det da med hensyn til hiken siges at der blev fĂždt en kalv pĂ„ gĂ„rden hvor vi overnattede. Jeg var heldigvis ikke med til at overvĂŠre det, men da ungerne fik lov at navngive kalven kom den efter sigende til at hedder Jonas, da det var det vĂŠrste navn ungerne kunne komme i tanke om 🙂 Personligt har jeg ogsĂ„ lidt ondt af kalven, specielt fordi det var en hun-kalv…



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