How to become an author

AARRR stand for:

• Acquisition.
• Activation.
• Retention.
• Revenue.
• Referral.

AARRR (also called the Pirate Metrics) describes the sales funnel. At the top of the funnel are visitors who only saw your application, or just downloaded it and still do not know how they will interact with it. Next, visitors are registered — of course, if it is provided by the functionality of the application.

Now they (you can start calling them users) reach the moment when they have to understand the value of the product and decide to remain its user, i.e. start buying some services, recommend the application to your friends and, in general, constantly return to the application for any purpose, or delete it from mobile device.

You will not have another chance to impress the user!

The AARRR framework forces developers to measure their sales funnel numerically. At every stage.

With the appearance of ECMAScript 2015, an avalanche of features came; some of them make you mad, and others are pleasant surprises, like meeting an old friend after a long time.

Some features are related to metaprogramming. What is that? I'm not very eloquent, so let's turn to our friend, Wikipedia.

If you use Habr, chances are, you’re conscious about privacy on the web. As governments and corporations tighten their grip on people’s online activities, the issue of keeping your browsing data to yourself becomes more and more relevant.

Numerous tech websites say VPN is no longer a geek-only thing, and regular people should use it, too (Fast Company, Mashable, PCMag). But as a tech-savvy person, you know there isn’t a service you can trust as much as the one you host and manage yourself.

With this post, you’ll deploy your own instance of Outline VPN on AWS.

Today’s taxi market is crowded with ride-sharing apps like Uber, Ola, and Lyft. They are giving serious competition for upcoming ventures. These on-demand apps have initiated the radical shift in the taxi industry enabling the smooth transition from conventional taxi hailing to booking a cab through an app. Customers are opting for hailing taxis through the app because of its reliability to get a taxi and ensuring a much better cab booking experience. Thus, the taxi market is ripe for the taking, and this is the right time for entrepreneurs to make use of the opportunity.

Statistics on the Taxi Industry

The traditional taxi industry is still stuck with inefficient phone call bookings, competitors and they stand to lose at least $20 million on an everyday basis just because customers couldn’t find a cab. Another statistics survey tells us that almost 80% of the commuter prefer Ola and Uber over regular taxis and that Uber has completed nearly 2 billion rides since its inception. The profits soared over $20 Billion in the process. What made Uber and Ola successful ventures is the sound business strategy they employed. So if you are going to establish your venture then understanding the market is imperative.

Laziness moves the world. And today we have more and more robotic vacuum cleaners that are saving our time for something more pleasant than just vacuuming.

The robots were marketed as internet/Bluetooth/smartphone connected devices with a speaker and camera to report and explore the environment. They also have different sensors to dodge barriers and such. But that’s only some ordinary stuff everyone knows about the robotic vacuum cleaners.
But the most interesting thing about them is their software. The owners can reprogram these devices and implement different settings as well as voice acting that has a huge number of options, including funny ones. And all you need to “upgrade” your vacuum cleaner is a PC, an internet connection, and a smartphone:

As a platform, many enterprises are leveraging iOS to realize the amazing benefits of cloud computing. This is one aspect of digital transformation that has been rocking the entire industry in recent times. Generally, there is only a few internet-based development and deployment service performed on the platform that is not concerned with cloud application development. Nowadays, there is a growing population of iOS developers and app development companies that are steadily adopting cloud computing.

Web application firewall

Web application firewalls (WAFs) are a type of intrusion detection and prevention system and might be either a hardware or software solution. It is specifically designed to inspect HTTP(s) and analyse the GET and POST requests using the appalling detection logic explained below. Web application firewall software is generally available as a web server plugin.

WAF has become extremely popular and various companies offer a variety of solutions in different price categories, from small businesses to large corporations. Modern WAF is popular because it has a wide range of covered tasks, so web application developers can rely on it for various security issues, but with the assumption that this solution cannot guarantee absolute protection. A basic WAF workflow is shown below.



Its main function is the detection and blocking of queries in which, according to WAF analysis, there are some anomalies, or an attacking vector is traced. Such an analysis should not make it difficult for legitimate users to interact with a web application, but, at the same time, it must accurately and timely detect any attempted attack. In order to implement this functionality, WAF developers usually use regular expressions, tokens, behavioural analysis, reputation analysis and machine learning, and, often, all these technologies are used together.



In addition, WAF can also provide other functionality: protection from DDoS, blocking of IP-addresses of attackers, tracking of suspicious IP-addresses, adding an HTTP-only flag to the cookie, or adding the functionality of CSRF-tokens. Each WAF is individual and has a unique internal arrangement, but there are some typical methods used for analysis.

Technology and markets are going hand in hand today. It's going so close that any whiff of a tech headway and social media is going up in a frenzy about it. Writers are filling pages after pages as if it's already here. Shares ride bull or bear, and newspapers print a string of capital letters.

As Senior Software Engineer at company building messaging platform for healthcare industry I am responsible, including other duties, for performance of our application. We develop pretty standard web-service using Ruby on Rails application for business logic and API, React + Redux for users' facing single page application, as database we use PostgreSQL. Common reasons for performance problems in similar stacks are heavy queries to database and I would like to tell the story how we applied non-standard but fairly simple optimisations to improve performance.

Our business operates in US, so we have to be HIPAA compliant and follow certain security policies, security audit is something that we are always prepared for. To reduce risks and costs we rely on a special cloud provider to run our applications and databases, very similar to what Heroku does. On one hand it allows us to focus on building our platform but on the other hand it adds an additional limitation to our infrastructure. Talking shortly — we cannot scale up infinitely. As a successful startup we double number of users every few month and one day our monitoring told us that we were exceeding disk IO quota on the database server. Underlying AWS started throttling which was resulting in a significant performance degradation. Ruby application was not capable to serve all incoming traffic because Unicorn workers were spending too much time awaiting for database's response, customers were unhappy.

At my agency we work a lot with international candidates and German companies. So, I wanted to write a small essay about the visa issues because often they will influence your chances of landing a job heavily. Since I work mostly with German market, I will talk about the processes in Germany, the processes may and probably are different in other EU countries. Hopefully the information will be helpful and will give you some clarity.

As all of you know, nowadays there is a big demand for experienced IT professionals in almost all EU countries. When I say experienced I mean 3+ years of experience. Companies are adjusting their teams to accept English speaking colleagues from around the globe, coming up with different perks to smooth up the relocation process and in general the IT world is becoming predominantly English speaking. Germany government understanding the demand by the industry has made the process quite fast and straightforward. I expect even easier process to be implemented in the upcoming year or two.

Visa sponsorship

Companies in Germany do not sponsor visas like in other countries, there is no such a term here. Companies either hire non-EU candidates or not. The decision is strictly an internal decision and is not influenced by any quotas, permissions etc. If you get a job contract from a German company (be it a big conglomerate or a small startup) you have a right to apply for the work visa.

Do I need a university degree?

How often do you get to 404 pages? Usually, they are not styled and stay default. Recently I’ve found test.do.am which interactive character attracts attention and livens up the error page.

Probably, there was just a cat picture, then they thought up eyes movement and developer implemented the idea.Now user visits the page and checks out the effect. It’s cool and pleasant small feature, it catches, then user discusses it with colleagues or friends and even repeats the feature. It could be this easy, if not:

I am Shalitha Suranga from Sri Lanka. I started Neutralinojs project with other two members as our research project at university.

Cross-platform application development is extremely useful among software development organizations because a large end-user audience can be targeted. Earlier there were several approaches, such as writing multiple codebases per each platform, writing a single codebase using conditionals for platform selection, or using a programming language which has a cross-platform virtual machine at run-time. There were drawbacks of each like complexity of design, limited low-level accessibility and slow learning rate. Cross-platform application development with web technologies came [1] after. Electron and NW.js are most popular frameworks which allow developers to make cross-platform applications using Javascript. Basically, these popular frameworks combine embedded chromium browser and node run-time [2], [3].

These frameworks are being used to create numerous cross-platform applications. Whereas the community pointed out several unseen drawbacks of these frameworks. Large bundled application size, high memory consumption and long development workflow are the key things which were criticized through internet forums and websites [4], [5], [6], [7], [8]. Table 1.1 shows the advantages and disadvantages of Electron/NW.js.

Table 1.1: Advantages and Disadvantages of Electron/NW,js

Advantages of Electron and NW.js	Disadvantages of Electron and NW.js
Development is very easy since Javascript is used	Application bundle is considered as bloatware (High disk space usage)
Access native functions via node runtimeSingle codebase for all supported platforms Linux, Windows and macOS	High memory consumption and slowness
	Many Node modules need to be installed

This week, NSA (National Security Agency) all of a sudden made a gift to humanity, opening sources of their software reverse engineering framework. Community of the reverse engineers and security experts with great enthusiasm started to explore the new toy. According to the feedback, it’s really amazing tool, able to compete with existing solutions, such as IDA Pro, R2 and JEB. The tool is called Ghidra and professional resources are full of impressions from researchers. Actually, they had a good reason: not every day government organizations provide access to their internal tools. Myself as a professional reverse engineer and malware analyst couldn’t pass by as well. I decided to spend a weekend or two and get a first impression of the tool. I had played a bit with disassembly and decided to check extensibility of the tool. In this series of articles, I'll explain the development of Ghidra add-on, which loads custom format, used to solve CTF task. As it’s a large framework and I've chosen quite complicated task, I’ll break the article into several parts.

By the end of this part I hope to setup development environment and build minimal module, which will be able to recognize format of the WebAssembly file and will suggest the right disassembler to process it.

Navigation in developing Android apps is quite important and you should think twice what library suits (or your own solution) most and how it will be convenient to use when the app becomes bigger. Also, it might be good to think about how easy it will be to change your implementation to another one.

Google and Facebook are the computerized behemoths who dependably contend. Their answers for designers Angular and React appear matches as well. Demand helps look at both. The article was initially posted here

Toward the start of its advancement, SPA web stages did not have an adaptable however basic framework for making the ventures that could revise and, now and again, supplant both portable and work area applications. Around then, a client whose issue was very basic needed to discover an application equipped for tackling the issue. Over the span of time, the advancements continued pushing ahead making web administrations gain ubiquity since the last had no should be introduced. What was required is simply to visit a site for getting to some administration. Already, such errands could be tackled through sites written in either ActionScript or Java. Nonetheless, those frameworks required to introduce either Flash or Java being in the meantime a long way from the speed expected by the clients.@Angular

By then, JavaScript advanced adequately to desert its adversaries because of a fast, improvement straightforwardness, and ceaseless help of the programs' engineers. The period of JavaScript began inciting such definition as SPA (Single Page Application) which gave another way to deal with the advancement of web stages. Not at all like its precursor MPA (Multi-Page Application), SPA permitted a web administration to work a lot quicker just as to give it an increasingly refined usefulness fit for changing progressively as per clients' needs. The greatest disadvantage was in unadulterated JavaScript which couldn't give a quick improvement when even a crude SPA web administration required a ton of time to be made. That is the reason Google chosen to help the methodology with a system that could enable different organizations to create muddled web administrations without investing a lot of energy for it.

If someone of you has tried create angular libraries, he may face the issue with lazy loading Feature Module from node_modules. Let's dive deeper and go thru the dark water.

Creating library tools

In today’s world, Kazakhstan carries out significant improvement work for the economic situation of the country. As part of a commission from Head of State, National Bank of Kazakhstan has revoked licenses of three commercial bank pursued high-risk policy (NBK, 2017). Furthermore, over the past 10 years, 7 second-tier banks have gone into liquidation as well as the liabilities of the commercial banks as a whole have increased by 70 per cent or 5.5 trillion Tenge (Hereinafter — KZT). NBK plans to continue treatment the real economy sector, withdrawal of financial institution, restructuring its assets to well-balanced entities.

On the other side of the world, the digital and mobile banks namely, Starling bank, Monzo, N26 are becoming increasingly popular among society in the United Kingdom. As a vivid illustration, Starling Bank has increased considerably the number of customers for 8 times (up to 400 000 people) at the end of the 2018 year (Starling Bank, 2019). At the same time, one million clients have joined and used Monzo’s services (Monzo). Such tendency establishes substantial competition for all players including high-street banks in the payments market.

In consequences, the main object of the paper is identification the advantages of digital bank and illumination capabilities to deploy analogous mobile bank in Kazakhstani real financial sector.

Introduction

In the modern world, new technologies become important factors of the development of financial sphere of world economy. Emergency of such cryptocurrency as Bitcoin is connected with both great opportunities and certain risks for the users of this cryptocurrency. The aim of the present work is to determine the main factors which affect the price of Bitcoin.

It’s More Than You Imagine…

The possibility of acquiring more profit through a chat app solution is gaining popularity than adopting to monthly plans based chat platforms

With the rise of instant conversation among the users, it's not surprising that the global mobile messaging app is estimated to reach around 2.1 billion active users by 2020. When the communication lies as the significant action in nature, then in fact the underlying tool “messaging application” also acquires the same importance. Thus, every chat platforms like WhatsApp demand a great market value according to the features and functionalities listed. Most of the business professionals and enterprises are urged to rely on subscription-based plans to avail such messaging platform.

Ten years ago, companies who wanted to create cross-platform projects would have to cooperate with different development teams and experts. However, 2009 has changed the game, because the developers from Nitobi (later purchased by Apache) presented Cordova – a fresh framework that was able to convert web applications into mobile systems. Linking the devices’ APIs via plugins, developers could access smartphones and tablets. Cordova is a JavaScript-based tech compatible with various platforms.

In this guide, we will review three more JS-driven systems, look at their unique features and compare them.