peleshenko

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Blockchain and quantum computers

Blockchain and quantum computers

Finally I have been involved into blockchain madness. “Finally” because it seems that hype around blockchain is decreasing and “madness” because I feel like Vavilen Tatarsky from Generation P by Victor Pelevin and Ijon Tichy from The Futurological Congress by Stanislav Lem. And fact that the project is related to quantum computers adds makes everything more futuristic.

What actually blockchain…

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Why do I like fixed-price projects? We have been delivering software development services at Tesseris Pro for more than 8 years. During this time, I’ve learned one interesting thing.

[peleshenko]

WPF vs ElectronJS

Several days ago we got final results of comparison of WPF and ElectronJS performance for one of our projects. The applications should load quite big files with data series and show all the data on the same line chart. Of course application is doing much more functions and we were working on it for 4+ years but this is some of most important features from point of view of performance. During…

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Stream voice recognition in browser Modern web application are full of rich features. What about stream voice recognition. Not there is no "HTMLvnext" feature for voice recognition but there are different services like AWS Transcribe, IBM Watson and Google Speech to text.

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Kiosk applications with HTML/JavaScript

Kiosk applications with HTML/JavaScript

Recently one of our client asked me about possibility to build a kiosk application with Mac mini and huge display with touch support. Display is really big about 2 meters wide. Why Mac mini, I asked, it’s expensive and makes no sense? The client answered – “we just have one and our admin like Apple”.

I’ve investigated a little and asked our devs to make a proof of concept. And we found that it’s…

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Need to build a video chat or an online classroom. It's simpler that you thought.

Need to build a video chat or an online classroom. It’s simpler that you thought.

The technologies I’m going to describe here are several years old, but taking into account our client questions I decided to write this post. Imagine you need to build an online classroom solution. The core functionality will be online video, online whiteboard, online presentation, and other features that allow teacher to share materials in real time. Let’s first take a look on video streaming. We…

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How to create PDF editor with NodeJS and React in 6 weeks

How to create PDF editor with NodeJS and React in 6 weeks

One of our clients asked me about possibility to create a tool for sales people to help them to create brochures catalogs and other printed materials. The idea was quite simple. Create a template with placeholders and allow users to fill placeholders by images, texts logos etc. Solution was required to be implemented as Web application accessible from tablets and desktops.

My first estimate was…

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How to copy required node modules to target dir with gulp?

How to copy required node modules to target dir with gulp?

One of the common tasks related to node.js development is building production ready package. Sometimes you just need to clean and install production only scripts but sometimes you need something more complicated like preparing files for electron package. And one of important part is to copy correct node modules to target locations. By correct node modules I mean production dependencies without…

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Node.js C/C++ module is actually simple

Node.js C/C++ module is actually simple

Node.js is one of most unexpected technology for me JavaScript on server side was unbelievable thing for me 5 years ago. And to be honest JavaScript was not very straight forward technology with main goal to handle HTML/CSS based UI. But now we have several successful Node.js projects in Tesseris Proand is seems like everything will be done with JavaScript soon. And JavaScript itself become much…

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Electron. Asynchrony, Modules and C/C++

Electron. Asynchrony, Modules and C/C++

There are a lot of posts about NodeJS describing innovative solutions about JavaScript on server side. However there is another place where JavaScript, V8 and Chrome HTML engine can be applied. That place is your desktop and Electronis a technology that makes possible to create desktop applications with JavaScript/HTML. I’m sure most of us already have experience in Electron. I’m sure that…

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Some python fun for presentations

The post contains ultimate off-topic, so source code is here :) : https://bitbucket.org/dpeleshenko/mdshow

Except managing managing my company Tesseris Pro and working as a developer I am working with student in one of Kharkiv university. That is a good way to find young talents and prepare them to work in our company.

So I am very often preparing some technical presentations. I have a huge…

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Hello World in Visual Studio Code on Linux

Hello World in Visual Studio Code on Linux

This post adds a sample as addition to my post about VS Code previous post

Setup

Install latest mono as described at http://www.mono-project.com/docs/getting-started/install/linux/#debian-ubuntu-and-derivatives.

Install Visual Studio Code from https://code.visualstudio.com Just unpack and start.

Simple Scenario (no debug and no IntelliSense) Code ./program.cs

public static class Programm {…

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Visual Studio Code on Linux

How to use Visual Studio Code for mono development with Linux.

Microsoft declares that new version of .Net and new alternative dev tool Visual Studio Code will be available for multiple platforms, including Linux.

In this post I will try to describe my Visual Studio Code usage experience. I will not describe .Net Code or DNX or Mono in details and focus on Visual Studio. I will use mono because .Net Core/DNX currently is incomplete and debugging using it is…

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DNX, .Net Core, ASP.Net vNext, who is who?

DNX, .Net Core, ASP.Net vNext, who is who? Understanding the place of every technology...

I’m writing this blog after we have done several projects (some of them was commercial, some internal) with these technologies in Tesseris Pro and discovered a lot of things that are not covered by documentation.

Let’s try do understand place of every project in global picture

Many of us already know about new version of .Net. There are a lot of resource saying that it will be open source, will…

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WPF vs. GDI+ Some additional notes.

In one of my previous posts WPF vs. GDI+ I wrote about performance of WPF and how to solve this problem. After some experiments in Tesseris Prowe’ve found more improvements to solution described in previous post. The main idea is that when you are converting GDI bitmap to WPF bitmap it requires memory allocation and deceases performance. And fortunately there is solution that allows to map WPF…

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Editing code dirrectly in browser (WebKit)

Editing code dirrectly in browser

May be some people already know this feature, but I was discovered it only today. A lot of JS debugging bring some benefits and today I found possibility to edit code and save it on disk with Google Chrome (or any other WebKit based browser). Hope this will simplify some debugging tasks for you. See how to enable this feature bellow:

Add folders(s) with your source code to browser’s workspace

A…

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JavaScript and different ***Script

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h3>Today I’ll just share my opinion so, no useful information bellow :)

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h3> There are a lot of discussions around TypeScript, CoffeeScript and other languages translated to JS. Let me add several words to this “holly war”:) I was codding for a couple of months with TypeScript. It was complex UI with Knockout.js and Durandal. Yesterday I switched to pure JavaScript task. I have to help on other…