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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 Ask HN: What is your “I don't care if this succeeds” project?
Of course! I do hang NFC tags around preselected vines and I did wrote small iOS app that after scanning the tag I am able to attach photos, labels or other metadata that are interesting from breeder perspecitve. I am also able to track lineages and compare the stability of attributes I am interested in.

Most other breeders use pen and paper and they are fine, but hey I am programmer and I am going to write software.

dejv··on Ask HN: What is your “I don't care if this succeeds” project?
There is a wine grape varietal called St. Laurent which is cousin of well known Pinot Noir varietal and it originated from Burgundy, but curently you will find it mostly only in Austria, Slovakia and Czech Republic. It is interesting grape, but there are many problems with it: it is very vigorous so it take quite a lot of work to tend and the bunches are big so they tend to squeeze, crack and rot.

Thanks to cultivation dificulties as well as bad image from previous times (thanks to big yields it use to be used for poducing cheap table wines) make this varietal slowly dying: old blocks are being replanted by other varietals.

I think it is a pitty as St. Laurent wine is very interesting and quite memorable. Luckily I've bought few blocks with old vines and I am selecting plants with loose bunches and am trying to create new clone with more favorable growing characteristic.

dejv··on Collapse OS – bootstrap post-collapse technology
Most of the machinery both industrial and in home are now computer controlled. Things like furnaces, CNC machining centers and lathes.
dejv··on France has passed a law protecting the sounds and smells of the countryside
Don't know about USA, but in Europe there are very strict laws about pesticide use (things like wind speed, droplet size and buffer zones) to make general public safe. As a certified agronomist (person who give orders to start spraying) but to some extend also tractor driver you are personally liable to follow the rules. I am sure similar legislative is in use as well.
dejv··on Raspberry Pi Pico and RP2040 Microcontroller
There are various new boards using same chip poping out everywhere (Adafruit, Sparkfun...) so availablity should not be a problem here as batch sizes of chips are huge. I am actually looking forward to see what the price of chip is going to be. This might be a great contender to STM32 familly.
dejv··on Ask HN: Working for US companies 100% remotely from Europe?
I did work as a senior/tech lead position in multiple US startups (VC backed, seed to series A) for few years while being 100% remote. I was independent contractor billing via llc equivalent company I own.

I guess it is all about positioning, there is no way to win trying to compete in budget low quality work (fixing small business websites, writing scrapers and whatever is trending on upwork these days) and hoping to climb ladder somehow.

I went through subcontracting for digital agency I've met through some of my open source work.

At the end I've made nice money, bought a house and hit glass ceiling few times. It was fun, but then kids happened and time zones together with work pace required to sustain senior roles in startups just make me quit and don't look for another opportunity.

dejv··on Ask HN: What are you working on?
I am building Duolingo for piano. Set of exercises in browser with midi support, I launched first two exercises as of now and adding another two next week. You can check it out at https://legatoforte.com
dejv··on The Rise of the Full-Stack Freelancer
I think that gig economy (in our programming world) do not care about having skill of 10 expert people, but having some skills in multiple areas. Lets be honest in here, most of the programming jobs are not really that complex. Be good in reading source code and making sense of mess other people left there, have some people skill, be on time and you are set for a life.
dejv··on Ask HN: Show me your half baked project
https://legatoforte.com

App for practicing some basic piano stuff, things like note sight reading and piano scales. Worsk best when you connect MIDI keyboard. (More exercises comming soon)

dejv··on Ask HN: Predictions for 2021?
Work habits will change: more freelancing and gig economy stuff will creep into white collar job marked. Also there will be new seminal book for new way of thinking about work or work life balance similar to 4-Hour Work Week was hitting nerve with 2008 economic crysis.
dejv··on Ask HN: What's a side project you built to make money that hasn't?
Sure, there are plans you need to adhere to, so you can get quality you need (and you need to keep records of what, when and how much you spray and calculate if you are within limit, depending on country and form of agriculture practice you adhere to). This is already in the app.

Drones for spraying is buzzword for past few years, but it isn't going to work for many different reasons both technical and legislative. At the end the act of spraying is not pain point for vineyards: the current technology is dependable, easy and proven. (Speaking as a certified farmer)

dejv··on Ask HN: What's a side project you built to make money that hasn't?
I must have finished like 15 projects that was meant to be generating money and was technically capable to do that.

Biggest failure was SAAS for organizing wineries and generating reports for carious government bodies. There are various old software from 90s that do that or you can use paper books (depending on country you are not allowed to use excel).

I've spent around 3 years of fulltime work but it turned out farmers do not care about software. They might use some old desktop software or just hope that inspection is not going to come. Software is still up and running and there are some paying customers, but it just doesn't make sense to spend much time working against the wind. Also my addressable market is not big enough to support additional development.

dejv··on Show HN: Thruhikes – A list of long distance hikes around the world
Well, it is actually bike path. I can't talk about whole road, but at the leg through the Czech republic is actually well marked on each intersection.

Here is a map I found: https://en.eurovelo.com/ev9 This route actually didn't end at Venice as it suppose to end (and didn't pass through the Baltic states), but it is nice overview.

dejv··on Show HN: Thruhikes – A list of long distance hikes around the world
Not the best known, but still beautiful and very varied is Amber Road that goes from Russia through Baltics, Poland, Czech Republic, Austria, Hungary and down to the Venice or even Rome. 2000km in total. Bonus point you will cross my vineyard on the way.
dejv··on EU countries team up for semiconductor push
Antivirus software is quite strong in EU: Avast and AVG (acquired by Avast) come to mind.
dejv··on EU countries team up for semiconductor push
EU power is in niches. There are many companies specialised equipment, are worth billions and if you are not in that niche you probably never hear pf them. For example most of electron microscopes are developed and manufactured in EU. (Actually more than 60% of world supply is manufactured in my home town of 350k)
dejv··on 1% of farms operate 70% of world's farmland
There is a niche for small scale farms, but those had to be run like a business. And let me tell you it is tough business to run with high capital costs and low margins.

Huge companies have many advantages in certain production areas, but there are many others like intensive vegetable production, wine grapes, poultry, rabbits (just to name some animal production) and some speciality crops that favor small producers. Farms just need to invest in building their own supply chain.

dejv··on Misfit Tractors a Money Saver for Arkansas Farmer
Well, the time window in which you should do certain farming operation without product degradation is often quite short and having smaller tractor doing it autonomously might not cut it. Once you need to buy few of those to replace one you are buying into bigger chance to failure, more maintenance duties etc and it might result in higher cost per unit.
dejv··on Misfit Tractors a Money Saver for Arkansas Farmer
As a farmer I am interested buying one, especially as I am using tractors for light work: spraying, towing and light field work. There are few hacked tractors already available, but it will take some time before supply chain mature enough.

I am pessimistic about having heavy duty industrial scale tractors with current battery technology. Those machines are monsters and when you interpolate consumption from light workloads to those monsters it just doesn't compute. Another angle in economics is that those machines have to work for many hours a day (combines in heavy seasons run for 12+, 7 days a week) which is also hard with current batteries.

dejv··on Have Fruits and Vegetables Become Less Nutritious? (2011)
Unfortunately lots of them were lost back in 50s and 60s with advent of seed companies. Also in Europe selling seeds of non approved varietals is not possible. Legislation is changing slowly, but a lot of diversity is lost forever.

What you can see a lot on current market are "heirloom" varietals made by entrepreneurs that take industrial variatel, cross them to create new completely new varietals. But just because something doesn't look like modern tomato it doesn't mean it taste good.

You can still find old varietals in seed banks and around seed savers, but hip breeders are much more noisy in the market. I am not saying those new breeds are worthless, but they are kinda hit and miss and I would not consider them heirloom.

dejv··on Have Fruits and Vegetables Become Less Nutritious? (2011)
Well, even growing your own tomatoes might not help that much. Modern hybrid varietals are breeded for color uniformity which removed the taste. Let me tell you it is quite hard to source real heirloom varietals: there are tons of new "heirloom" varietals, but those are basically just modern varietals with some mutations that makes them not look like industrial ones.
dejv··on Vt52-FPGA
Any recommendations on good books that cover FPGA programming?
dejv··on Ask HN: Consultants and freelancers, how do you handle invoicing?
I used to work more randomly when I was starting, but I am now having strict routine with set working hours. That makes it easy to bill by man-days.

Decision is usually by customer, I am trying to go with having man-days as billable unit as much as possible, but it is not battle worth winning every time. At the end what customer want is having clear idea how much is project going cost and trust that quality would be (at least) good enough.

dejv··on So you want to buy a farm?
Organic farmer here: I haven't seen country that allow herbicides for use in organic farming. Speaking of different pesticides you are basically left with nonsystematic fungicides (a lot of them as sulfur or copper based) and biological control against living pest.
dejv··on Ask HN: Consultants and freelancers, how do you handle invoicing?
I am soon going to be freelancing for 20 years and I must say it is still per client basis. There are projects billed hourly, there are fixed scoped projects and retainers with some time budgets.

I would stay away trying to be super detailed about what you did in small time increments, unless required by customer. Nobody really cares about it, it is much better to say "Feature A development. 30hrs" than "Feature A research 15 mins, Emails 1hr. Rework screen A 4hrs... and so forth in long letter that looks like AWS bill.

I do track my time per project (usually break down to dev and admin category) but give out just half-day or maybe hour increments.

dejv··on Jetson Nano Developer Kit
It is more like email or two to get what you need. No need to employ fulltime person to handle it.
dejv··on Jetson Nano Developer Kit
I can't remember the name of vendor, but they were from some niche manufacturer of professional machine vision cameras from Germany. Each of those cost few 1000s euros.

Almost anything for industrial use cost you a leg and then some. If you want to experiment with CV at home I would take a look at that high quality camera module from RPi.

dejv··on Jetson Nano Developer Kit
I worked on optical sorting project that use cameras to scan many 1000s of small berries a second and you had around 10ms to extract each berry from video stream, calculate the center of object, decide if quality is good enough and schedule air stream to shoot in particular time to so it gets shoot out in exact time. Good luck trying to do that on Arduino type of board.

Industrial and industrial IoT is one of the use case for these kind of boards. These machines are not produced in high quantities so finding existing modules saves a tons of R&D budget.

dejv··on Jetson Nano Developer Kit
You don’t want to buy via distributor as a non-hobby person anyway. NVIDIA have a strong partner programs that hook you up with boards you need and with different pricing.
dejv··on Why hasn't prefab construction taken over?
Transportation should be around 5-8%.
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