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dejv

2,312 karma · joined July 17, 2009

Indie software developer since 2005. Fiddling with projects, freelancing from time to time and basically trying to find a way to not ever have another proper job again.

If I am not writing software I am making wine or tend vines on my organic farm.

E-mail: davidfilip@gmail.com

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dejv··on Why hasn't prefab construction taken over?
It is local company from Czech republic called Freedomky. One example: https://www.dwell.com/home/freedomek-no.061-ce8de0e1
dejv··on Why hasn't prefab construction taken over?
We are buying house from company that is building them fully assembled: house is assembled indoor and include all electrical, plumbing, HVAC, insulation. Whole system is based on few types of modules that you can connect together and it scale from tiny house to standard house sizes and modules could be even stacked to get multiple floor levels.
dejv··on Why hasn't prefab construction taken over?
I am currently in the process of buying prefab house and after visiting couple of local factories it seems like most of them is doing just framing and competing on price only.

We are going with company that actually assemble full house inside and bring it to site fully equipped: electrical, plumbing etc.

dejv··on The Death of the Full Moon Party
After years of being against all of those visa-runners and digital nomads of all kinds I am a bit skeptical of Thai goverment actually wanting long-stay tourists.
dejv··on Show HN: Growing Wine Grapes in My Parents' Basement
So, I am actuall winemaker and wine grower myself and I am a bit sceptical about all of this.

Did you actually get any fruit already? What is the yield per plant? What are you going to do with the wood after the fruit is set: are you overwintering it or throwing away?

dejv··on Woman hatches ducks from Waitrose eggs
It works both ways, you can sometimes see weird colored ducks in flock of wild ducks. These are most probably crossbreeds with domestic animals.
dejv··on Scientists who never won a Nobel Prize
Well there are many great scientists that should won Nobel Price. My favorite was Antonin Holy [0].

Very humble guy who invented a lot of modern drugs, but who didn't like to go conference circus road which is required to get the prize (paraphrasing his words). He worked in the lab till his dead, lived in cheap house and commuted to work by public transport even after earning hundreds of millions, or more, in fees for his discoveries.

[0] https://en.m.wikipedia.org/wiki/Anton%C3%ADn_Holý

dejv··on Helping Native Bees Thrive in a Honeybee World
Genuine answer: it depends. I guess you just have to be present and observe what is going on and try to get closer to what you try to achieve.

What works all the time is to not cut the whole place at once: so insects have another places to move to. I am also trying to make sure grasses don't take over the place.

But the thing is: even on my few acres spread in diameter of few kilometers I am getting very different results.

dejv··on Helping Native Bees Thrive in a Honeybee World
Or maybe just stop cutting your lawn so often. With proper management it will get colonized by local species in a few years.
dejv··on Indian IT consultancies struggle against technological obsolescence
I've seen two type of compensation schemes during my agency years: ~60% take home, but zero during my downtime and around ~15% when I was salaried developer, which make sense as utilization of around 60% was expected.
dejv··on Indian IT consultancies struggle against technological obsolescence
20 USD/hour is not what developer earns, but what you pay for developer time. Overhead (buildings, managers, computers, toilet paper), sales commissions, taxes, and off time and eats big big part of that money.
dejv··on Your DS18B20 temperature sensor is likely a fake, counterfeit, clone
Well I guess when you invest in purchasing fab you want it utilized as much as possible, so you might want to add batch here and there when you dont have contract work.
dejv··on Ask HN: Have any of you moved back home to save money?
I did that 7 years ago. I was 28 years old and by that time spent all of my adult life chasing startups (both my own and helping others) without much to show for.

After living abroad (London, Berlin, Kuala Lumpur) I got back to small village of 1500 in the middle of nowhere, worked remotely and also bought some land to farm.

It was a big change to be back in place where I never fit in as a child (and escaped as soon as I could at the age of 15) and where I still struggle with small town mentality till this day. But it was also much needed break that gave me opportunity to not work that much, meet people whom live doesn't revolve around startups and after all I see it as a positive life event.

I've lasted there for 9 months or so and then moved to a city nearby, where I still live till this day. I am back in tech 4 days a week and then coming to my farm for two days a week. I would say my "sabbatical" helped me build new foundations of my current life.

dejv··on Wren is a small, fast, class-based concurrent scripting language
Well, it seems to be working very well, but I am still in development mode with one customer and very little scripting going on. I will know more after general public is going to use it and will try to use things I haven't think about.

I am not that concerned of Wren failing as a language, but I looking for a ways to prevent users write code that doesn't work without having to know what is going on, which is something Lua is excellent in (typo in variable name in if statement? Valid code for sure)

dejv··on Wren is a small, fast, class-based concurrent scripting language
I am building tool for generating PDFs (https://docula.app) and I am using Wren to allow user scripts: things like show/hide label on some value or maybe display number in red when the value is > 0 and green otherwise. I was thinking about using Lua, but Wren seems more approachable to me.
dejv··on What vertical farming and ag startups don't understand about agriculture, part 2
Machines like these exists in all scales you can imagine.

I had new vineyard planted two years ago. Big tractor with automatic planting station arrived and with GPS base station they were able to plan in around 2cm accuracy. There was no automatical steering, but whole machine and tractor shutted down when driver move out of mission plan. You can decide what is row spacing going to be, what space between plants are going to be and you are done.

What would take me week of manual labor took machine just 40 minutes (well kinda: one servo broke down and they had to call mechanic from Germany which took off two days of very expensive machine time in prime season).

Here you can see simmilar machine: https://www.youtube.com/watch?v=cC32JgiDxo4

dejv··on What vertical farming and ag startups don't understand about agriculture
decide what kind of agriculture you want to do and check what is time and money requirements and seasonality is. Next step could be doing internship to see what it it feels like. There are many options from wwoofing to more job like situations.

Well and then you are ready to decide. Being small farmer is tough: not a lot of money and a lot of work, but it is rewarding by many means.

I personally decided to be in more play farm: few acres of vineyards, small wine production. It is still professional operation but I don't expect to be making full living off it.

dejv··on Ask HN: What did you make during lockdown?
I've written SAAS called Docula (document generator that doesn't suck).

I've been programming professionaly for close to 20 years and no matter what I always ended up writing PDF generator for one case or another. This time I've had to write another PDF export again and I've decided to do it right this time.

Having some unexpected extra time I've decided to create WYSIWYG editor in similar fashion to Figma or Zeplin where you set your components and then you just call API endpoint with json data (variables, collections...) and you've got your pdf file

Stack is quite simple: Rails app for all the book keeping, visual editor is written in vanila JS and the generator itself which takes variables and template data (both json) is written in Go.

I am just getting ready to launch it, so if you are interested you can sign up at http://docula.app and I will send first batch of invites in month or so.

dejv··on Do I need to go to university?
I was born in post-communist country to the familly of blue collar workers, where nobody around me didn't even finished high school (fun fact, those more distant family members who actually had university degree or even hold profesorship position spent many years mining for uranus in political prison and then decades sweeping streets).

Anyway, I already had fulltime position working as software developer since the age of 17 (it was a bit of necessity, but I also like it very much) and after finishing my highschool diploma I decided to not apply and continue working.

I went to study CS at the age of 23, while still working fulltime. Being a bit older and more experienced, but also time constrained changed my perspective a bit. I was in there just to get knowledge that I decided are relevant for me, there was close to zero time to be spent on social time or taking some filler classes that might be interesting.

I spent three years in university, taking all the classes that sound interesting to me in areas of math, compilers, machine learning and computational logic. At that point I depleted the pool for both bachelor and masters classes and for the rest of the time I would have to go through fillers and decided to quit without graduating.

I am glad about both of my choices: both having break between high school and university and quiting early. I feel like spending time in university is very valuable for both professional and personal growth and everybody should probably took it if they can afford it, but I don't think that this is your only valid choice.

It should be ok to spend few years wandering around to find what you want to do with your life instead of spending rest of your life paying for debt you acquired just because you can't see any other viable path.

dejv··on Pulling apart a £339 anti-5G USB stick
Reminds me adapter plugs that filter out electricity generated by nuclear power plants.
dejv··on Ask HN: Do you still use MongoDB?
I am still using it for few legacy apps. I don't really love it but it it is rock solid for that payload: mostly just storing simple events. For new projects I just use Postgres, especially after they've introduced json datatype I don't have need for noSQL database for type of projects I am doing.
dejv··on Teensy 4.1 Development Board
For me it is rock solid USB and known quality. I use them as a bridge between analog/ADC board and USB, doing some buffering and signal processing for my spectroscopy projects.
dejv··on Vanilla Production in Geodesic Domes
Good luck importing any animal species to Australia. Also keeping bees alive and prosper would add another layer of complexity.
dejv··on Vanilla Production in Geodesic Domes
Cool concept, trellis system seems interesting, but getting one tonne out of 200 vines sounds quite optimistic, also as far as I know each flower had to be hand pollinated and window to do that is very short.

I am a farmer and there is one saying to never count the beans until you have them in the barn.

dejv··on Jetson AGX Xavier
For things like industrial robots or UAVs latency is biggest problem.

I've worked on fruit sorting machine and there was about 20ms to make decision if the object passed or not + there was continuous streams of 10000s of objects per second to classify. The computer vision/classifier had to be both fast and reliable about spitting the answers, which was actually more important than precission of classifier itself.

dejv··on Nvidia Releases Low-Cost, Open-Source Ventilator Design
Check out Corovent, its somehow open source (they have to hide their exact BOM for now, because of companies buying full stock of those parts). It is build by university team that actually design ventilators for 25 years and is certified to be used in case when there are no proper ventilators available. They are currently using industrial version of medical parts (due to limited availability of those parts) but full certification is in pipeline. They are just starting mass production now.
dejv··on Dvořák in Iowa
Proper Czech spelling is "Koláč" and it is universal word for round type of pastry with some filling in it. There are hundreds of variants depending on area and even familly.
dejv··on Psilocybin Produced in Yeast
Sorry but it is not allowed to make spirits at home in Czech Republic.

You can use certified distillery to make spirit from home grown fruit and pay taxes (although not as much as for commercial alcohol). This spirit is used for personal use only and could not be sold.

dejv··on Iranian teen shocks Magnus Carlsen to win $14k prize
I am really curious if we are going too see players adopting AlphaZero tactics. Games I saw goes so against current intuition and it would be interesting to see chess evolving.

Current crop of GMs benefited greatly from short feedback loops by using computers, but they still operate in explored problem space.

dejv··on What is the Strategic Petroleum Reserve?
The village I was born in sits on caverns like than which are used to store year worth of gas supply for whole country. Back in 70s one of the tower blow up resulting in huge huge gas burner/candle (100 meters tall). No damage or lives were lost but it took army two weeks to handle it (blew it by jet engine). This fire actually happened on my grandma backyard, but no evacuation was needed. In case oil behave the same like gas I would say it is relatively safe.
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