Blog

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Jun 22, 2019, 10:13 AM
Problem: we want queries to our entities to eagerly fetch only the fields that we need in the given context (for example to show in a specific UI data table). Requirement: our solution must be able to accept dynamic filter compositions. Possible solutions: Named Entity Graphs from the JPA standard or Projections mechanism from Spring Data. Lets research them!
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Feb 8, 2018, 12:12 PM
In the past months we could hear many controversies surrounding an upcoming coin developed by FutureNet called FuturoCoin. FutureNet is a social network and Multi Level Marketing (MLM) platform. Most of the cryto-community didn't take them seriously and ware expecting another DasCoin - a coin which had little do to with the term 'cryptocurrency' but was heavily marketed as such using MLM. Both FutureNet and the creators of DasCoin (Netleaders) are under investigation by the Polish government under the suspicion of being a ponzi-scheme. The fact that FutureNet promoted their FuturoCoin without even publishing a whitepaper also didn't help. Now that they finally have one and also published their source code we can see what this coin really is.
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Nov 1, 2017, 10:00 AM
If you're interested in Bitcoin, Ethereum, etc. then you're probably tempted by ads with mining equipment or cloud mining contracts. Many of them promise you substantial passive profits and a fast return of investment under one year. Can it really be this easy? Here at WALCZAK.IT we experiment heavily with cryptocurrencies and we've also build our behemoth of a rig which mines three totally different coins at once. We've experienced firsthand that cryptocurrency mining is not trivial, nor is it passive or risk-free. Here are some cons you should consider before investing into it.
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Oct 4, 2017, 10:13 PM
For the past few moths we've been developing our own simulation and notification system that aids us in cryptocurrency trading. As a byproduct of this enterprise we maintain a huge database of trades, exchange rates and OHLC data imported from many exchanges. We decided that it would be a shame to just keep this in-house so we're lunching a new polish website - kryptowalutownia.pl - on which you can view aggregated price charts and compare exchange rates from multiple exchanges.
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Sep 15, 2017, 7:06 PM
If you own Ethereum mining rigs with RX 470 / 480 / 570 / 580 AMD graphic cards you might have noticed that your hashrates have been slightly going down. In our RX 470 rig we went down from 27-28 MH/s per card to 25-26 MH/s. This drop will continue if you do nothing about it as the DAG file is slowly overwhelming your cards capabilities. Luckily AMD has been working on this problem.
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Aug 14, 2017, 2:47 PM
WordPress, Joomla and Drupal are still the most popular content management systems on the web but should you use them for your next project? All of them claim to have a good visual WYSIWYG page editor but once you see Concrete5 in action you'll realize how website editing should really look like. Lets compare.
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Nov 26, 2013, 6:53 PM
The first copies of our book "OPEN SOURCE projects – how are they organized and financed" saw daylight in the year 2011. It’s hard to believe that so many time has passed since its first release.
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Nov 18, 2013, 6:27 PM
In the last article we described why the division of responsibilities between ERP-MES systems from the IEC/ISO-62264 standard cannot be directly applied to small and medium enterprises. Now we’ll show you how we devised our own integration scheme for systems used in SME based on the conclusions from the previous analysis.
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Oct 22, 2013, 7:30 PM
At the beginning of the year we began preparations to design our own IT system for industrial production management targeted towards small and medium-sized enterprises. As part of this stage we analyzed standards related to such solutions. Our attention has been particularly caught by IEC/ISO-62264 (based on ISA-95), which attempts to construct an unified model of concepts, data structures and activities that occur at the interface between Enterprise Resource Planning systems and Manufacturing Execution Systems. Now came the time to share with you our insights and design sketches. This is our first article from a hole series that show you our efforts aimed at transferring the standards adopted for large ERP and MES systems to the SME scale of things.
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Apr 2, 2013, 12:34 PM
In the past year we took part in two startups and also got to know how many others work from the inside. Because of this we think its a good time to codify our 8 startup commandments. They are simple as a screw driver, every one believes in them, but few actually follow…