All streams

bevzuk Apr 17 2019 at 07:37

Technical debt leading to a company crisis

16 min

5.5K

Dodo Engineering corporate blogAgile * IT-companiesProduct Management * Project management *

Accumulating technical debt may lead your company to a crisis. But it may also become a powerful driver of massive process changes and help with engineering practices adoptions. I'll tell you about it on my own example.

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asantos Apr 5 2019 at 14:19

Particle systems: a Christmas story

6 min

2.8K

Badoo corporate blogSwift * Programming * Development of mobile applications * Development for iOS *

Christmas has always been one of my favourite times of the year. For me, Christmas is a season that brings so much love, laughter, happiness, and other magical things into our lives.

I was born and raised in Spain, more specifically in Tenerife, a sunny subtropical island in the middle of the Atlantic Ocean just off the African coast. I have to say that Christmas in Tenerife is very different to my the last two Christmases I’ve spent in London since joining Badoo.

One amazing plus of living in London is that I have got to see snow for the first time in my life, real snowflakes falling from the sky. Just incredible!

Talking of snowflakes, I have an interesting story to tell you about something that happened to me one day in the office the last Christmas. It was right before I was heading home to Tenerife to spend a few days with my family.

It just so happened that last December I’d been assigned a very interesting ticket with the following description

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didoo Mar 12 2019 at 13:01

Generating multi-brand multi-platform icons with Sketch and a Node.js script — Part #2

16 min

1.6K

Badoo corporate blogNode.JS * JavaScript * .NET * *nix *

This is the second part of a post about the creation of a pipeline that can take a Sketch file and export all the icons included in the file, in different formats, for different platforms, with the possibility of AB testing each icon.

You can read the first part of the post here.

The Sketch files, with all the icons collected, styled and properly named, were ready. Now it was time to start writing the code.

Suffice to say, the process was very much a trial and error: after the important initial code core, developed by my team lead Nikhil Verma (who set the script foundations), I went through an incremental process that required at least three phases of refactoring and quite a few revisions. For this reason, I won’t go into too much detail on how the script was developed, but rather focus on how the script works today, in its final shape.

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alex4Zero Mar 1 2019 at 10:13

Why does Dodo Pizza need 250 developers?

4 min

3.9K

Dodo Engineering corporate blogPersonnel Management * Programming *

Translation

In autumn, we announced we were going to expand our IT team from 49 to 250 developers. And immediately we were buried under an avalanche of questions — mostly, people were interested why a pizza chain needs so many software engineers. How did we come up with such a number? So now I want to answer that.

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erogov Feb 27 2019 at 15:27

Indexes in PostgreSQL — 1

13 min

27K

Postgres Professional corporate blogPostgreSQL * SQL *

Translation

Introduction

This series of articles is largely concerned with indexes in PostgreSQL.

Any subject can be considered from different perspectives. We will discuss matters that should interest an application developer who uses DBMS: what indexes are available, why there are so many different types of them, and how to use them to speed up queries. The topic can probably be covered in fewer words, but in secrecy we hope for a curious developer, who is also interested in details of the internals, especially since understanding of such details allows you to not only defer to other's judgement, but also make conclusions of your own.

Development of new types of indexes is outside the scope. This requires knowledge of the C programming language and pertains to the expertise of a system programmer rather than an application developer. For the same reason we almost won't discuss programming interfaces, but will focus only on what matters for working with ready-to-use indexes.

In this article we will discuss the distribution of responsibilities between the general indexing engine related to the DBMS core and individual index access methods, which PostgreSQL enables us to add as extensions. In the next article we will discuss the interface of the access method and critical concepts such as classes and operator families. After that long but necessary introduction we will consider details of the structure and application of different types of indexes: Hash, B-tree, GiST, SP-GiST, GIN and RUM, BRIN, and Bloom.

Before we start, I would like to thank Elena Indrupskaya for translating the articles to English.
Things have changed a bit since the original publication. My comments on the current state of affairs are indicated like this.

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ptsecurity Feb 20 2019 at 13:15

Detecting Web Attacks with a Seq2Seq Autoencoder

7 min

5.7K

Positive Technologies corporate blogInformation Security * Machine learning *

Attack detection has been a part of information security for decades. The first known intrusion detection system (IDS) implementations date back to the early 1980s.

Nowadays, an entire attack detection industry exists. There are a number of kinds of products—such as IDS, IPS, WAF, and firewall solutions—most of which offer rule-based attack detection. The idea of using some kind of statistical anomaly detection to identify attacks in production doesn’t seem as realistic as it used to. But is that assumption justified?

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sahsAGU Feb 15 2019 at 09:00

C++ Binary Compatibility and Pain-Free Upgrades to Visual Studio 2019

4 min

3.8K

Microsoft corporate blogC++ * Visual Studio * Programming *

Visual Studio 2019 pushes the boundaries of individual and team productivity. We hope that you will find these new capabilities compelling and start your upgrade to Visual Studio 2019 soon.

As you are considering this upgrade, rest assured that Visual Studio 2019 makes it distinctively easy to move your codebase from previous versions of Visual Studio. This post captures the reasons why your upgrade to Visual Studio 2019 will be pain-free.

You can install the latest IDE side-by-side with any older VS versions
You can continue building your C++ code with the MSVC v140 (VS 2015.3) or v141 (VS 2017) toolsets
You can upgrade to the latest MSVC v142 (VS 2019) and maintain binary compatibility with any of your 3rd party libraries that haven’t migrated yet
Regardless of the toolset you’re on, you get access to the full collection of OSS libraries available in Vcpkg

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arielf Feb 10 2019 at 19:15

On higher education, programmers and blue-collar job

13 min

9.2K

Studying in ITIT careerGTD *

“Sometimes it happens that a man’s circle of horizon becomes smaller and smaller, and as the radius approaches zero it concentrates on one point. And then that becomes his point of view.”

David Hilbert

“When I thought I had hit rock bottom, someone knocked from below.”

Stanisław Jerzy Lec

Preface

Does a programmer need a higher education? The flow of opinions on this undoubtedly urgent topic has not dried up, so I have decided to express my view. It seems to me the general disappointment in education is due to the numerous processes and changes in the profession and it needs serious study. Below I will discuss the most common misconceptions, myths, and underlying causes of the phenomenon.

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derSmoll Feb 3 2019 at 21:35

Frontend Weekly Digest (28 Jan – 3 Feb 2019)

2 min

1.8K

Website development * JavaScript * HTML * CSS *

This week we issue a really huge selection of all the essential news you might have missed on Front-end development. Make sure to check the latest updates on CSS, HTML, and JavaScript.

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dmitrykabanov Jan 27 2019 at 15:41

How Brands Can Break Through the Tech Media Bubble

7 min

1.3K

vscextv corporate blogInternet marketing * Content-marketing * Project management * Community management *

Good luck getting people to read your branded tech story. Now, before you get mad, I’m sure you’ve got something great to share. I’m sure you found an exciting new solution to some sort of problem. All you want is for others to be as excited about it as you are. Sadly, the odds are not in your favour.

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khdavid Jan 15 2019 at 22:10

Kalman Filter

9 min

6.5K

Algorithms * Mathematics *

Tutorial

Translation

There are a lot of different articles on Kalman filter, but it is difficult to find the one which contains an explanation, where all filtering formulas come from. I think that without understanding of that this science becomes completely non understandable. In this article I will try to explain everything in a simple way.

Kalman filter is very powerful tool for filtering of different kinds of data. The main idea behind this that one should use an information about the physical process. For example, if you are filtering data from a car’s speedometer then its inertia give you a right to treat a big speed deviation as a measuring error. Kalman filter is also interesting by the fact that in some way it is the best filter. We will discuss precisely what does it mean. In the end of the article I will show how it is possible to simplify the formulas.

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marks Jan 15 2019 at 09:38

Info Desk: «Internet Archive» — history, mission and subsidiary projects

6 min

History of IT

Translation

Probably, there are not so many users on Habr who have never heard about the «Internet Archive», a service that searches and stores the digital data that is important for all mankind, whether it be the Internet pages, books, videos or other type of information.

Who manages the Internet archive, when it appeared and what is its mission? Read about it in the today's «Inquiry».

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Shapelez Apr 14 2021 at 15:40

Qrator Labs' Value Partnership Programs

3 min

1.1K

Qrator Labs corporate blogBusiness Models * Sales management * Information Security *

Why is it valuable to get into the Qrator Labs partnership program?

In Qrator Labs, we firmly believe that working together brings a better result. Which is the reason why, for years, we were trying to find meaningful partnerships with all kinds of companies. They either seek to provide their existing customers with the top-notch DDoS mitigation technology developed at Qrator Labs with many additional ecosystem solutions or want to succeed the other way around. By getting their product available for Qrator Labs' customers by integrating into the Qrator anycast filtering network.

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VlK Jul 28 2020 at 10:51

C2x: the future C standard

8 min

17K

Badoo corporate blogSystem Programming * Programming * C++ * C *

I strain to make the far-off echo yield
A cue to the events that may come in my day.
(‘Doctor Zhivago’, Boris Pasternak)

I’ll be honest: I don’t write in pure C that often anymore and I haven’t been following the language’s development for a long time. However, two unexpected things happened recently: С won back the title of the most popular programming language according to TIOBE, and the first truly interesting book in years on this language was published. So, I decided to spend a few evenings studying material on C2x, the future version of C.

Here I will share with you what I consider to be its most interesting new features.

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baragol Dec 16 2019 at 13:46

Chronicle of Rambler Group and Nginx confrontation (updated on 23 Dec, 12 p.m.)

3 min

6.6K

Nginx * Legislation in ITFinance in IT

Translation

On December 12, it became known from Nginx's employee Twitter that the company's office was searched due to the criminal case under Article 146 of the Criminal Code of the Russian Federation 'Violation of Author's and Neighboring Rights'. The claim belong to Rambler Group was, although formally the complaintant is Lynwood Investments CY Ltd, to which the rights were transferred. The last-mentioned is related to the co-owner of Rambler Group, Alexander Mamut.

The point of the claim: Igor started working on Nginx as an employee of Rambler and only after the tool became popular he founded a separate company and attracted investments.

Here is how the events unfolded.

+20

Andrey2008 Aug 20 2019 at 13:19

PVS-Studio: Engine of Progress

3 min

660

PVS-Studio corporate blog

A PVS-Studio team and our product make a great contribution to upgrading of software quality. Moreover, in addition to detecting errors in closed and open source projects, there is an indirect contribution to the development of compilers and other tools of code analysis. We are pleased that in some cases we are trendsetters and we decided to dedicate a small note to this in our blog.

+20

pushtaev Aug 7 2019 at 12:34

Tips and tricks from my Telegram-channel @pythonetc, July 2019

4 min

1.4K

VK corporate blogPython * Programming *

It is a new selection of tips and tricks about Python and programming from my Telegram-channel @pythonetc.

← Previous publications

You can’t mutate closure variables by simply assigning them. Python treats assignment as a definition inside a function body and doesn’t make closure at all.

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Mimizavr Aug 5 2019 at 08:05

Hell or high water: history of Russian popular science literature

9 min

3.1K

Reading roomPopular science

Translation

And our homeland's pushing us For reaching knowledge higher heights.

The available and interesting literature on science is a magic wand that helps the progress not to slow down and move forward. Thanks to interesting science literature, children begin to study voluntarily and with interest, while adults expand their horizons and do not allow the brain to relax. Biology, astronomy and mathematics supplant the saga about the elves and intergalactic ships. But while Western countries' nonfiction was always in smooth progress from Jules Verne to Eliezer S. Yudkowsky, then opposite it experienced both ups and downs in Russia.

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SvyatoslavMC Jul 29 2019 at 06:29

Almost Perfect Libraries by Electronic Arts

4 min

5.7K

PVS-Studio corporate blogC * C++ * Open source * Game development *

Our attention was recently attracted by the Electronic Arts repository on GitHub. It's tiny, and of the twenty-three projects available there, only a few C++ libraries seemed interesting: EASTL, EAStdC, EABase, EAThread, EATest, EAMain, and EAAssert. The projects themselves are tiny too (about 10 files each), so bugs were found only in the «largest» project of 20 files :D But we did find them, and they do look interesting! As I was writing this post, we were also having a lively discussion of EA games and the company's policy :D

+20

GGribkov Jul 15 2019 at 13:30

Errors that static code analysis does not find because it is not used

5 min

PVS-Studio corporate blogC * C++ * GitHub *

Readers of our articles occasionally note that the PVS-Studio static code analyzer detects a large number of errors that are insignificant and don't affect the application. It is really so. For the most part, important bugs have already been fixed due to manual testing, user feedback, and other expensive methods. At the same time, many of these errors could have been found at the code writing stage and corrected with minimal loss of time, reputation and money. This article will provide several examples of real errors, which could have been immediately fixed, if project authors had used static code analysis.

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