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Machine Learning and Theory of Constraints

Reading time 3 min
Views 1.8K
Backlog prioritization requires simplification and weighting of tasks. Each one belongs to strategy like ads acquisition or CRO. We may consider turnover, operational costs, other metrics as input; profit margin, ROI — as output in case of retail. The perfect goal is to find 20/80 solution and focus resources on a single strategy at a time. Metrics tied to strategies gives the dimension of model. Sometimes unit economy relations are violated because of non-linearity. In practice it means low/insignificant correlation and poor regression. Example: it is impossible to separate acquisition and conversion — the quantity of acquisition affect its quality and vice versa. Decomposition of tasks/strategies assumes linear decomposition of nonlinear system. Besides nonlinear statistical evaluation of strategies is required when CJM can't be tracked or online/offline channels can't be separated.
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Total votes 13: ↑12 and ↓1 +11
Comments 2

Uber & Careem merger: How the emerging taxi hailing services will affect in MENA region?

Reading time 4 min
Views 2K
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Managing your competition is an important skill that you need to have as a company. The management of competition can either be done by letting go of a market because it is too much to handle. You can also consider either selling yourself to a competition in a particular local market or acquiring them. Different companies adopted varied strategies according to the moment’s and the market’s demands.

Focus on Uber

Uber needs no introduction as a corporate or as a service provider. It has become synonymous with on-demand cab services and is slowly progressing towards providing many other services in the same fashion.

The phrase ‘Let's book an Uber’ has become common. In a decade, Uber has gained the status of a monopoly and has marked a prominent presence in more than 70 countries ever since its inception in 2009. However, it hasn't always been a bed of roses for Uber.

Uber has faced a lot of legal issues, some of them because of the legislature of the country, local drivers and passengers.
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Total votes 16: ↑15 and ↓1 +14
Comments 0

15 Must-Have Tools for Product Managers in 2019

Reading time 6 min
Views 3.7K
The main objective of any product manager is to ensure the process of product management runs smoothly and flawlessly: from the concept to release. However, it's all about the ideal world.

In order to present a brilliant product to the world, it is important to learn how to use convenient and multifunctional online tools that facilitate management and open up new opportunities for managers, expanding their professional horizons. In this article, you will find 15 smart tools that contribute to the professional success of product managers in 2019.

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Total votes 12: ↑12 and ↓0 +12
Comments 0

Hell or high water: history of Russian popular science literature

Reading time 9 min
Views 2.9K
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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Total votes 22: ↑21 and ↓1 +20
Comments 6

50 Best Sources on Product Management to Read, Listen and Watch

Reading time 8 min
Views 13K
Young product managers aim to rapidly learn the fundamentals of their role and master the craft. However, there are no magic power, specific book or a class that can give you 100% of professional mastery.

You want it all, you want it now. But it will surely take some time to make you a product management guru. This post contains a set of relevant resources about product management for those who prefer to read, listen and watch.

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Total votes 12: ↑11 and ↓1 +10
Comments 2

Developers are now measured in views and subscribers — and that's wrong

Reading time 5 min
Views 6K


Recently I’ve been getting invited to a lot of interviews, and they all go pretty much the same way: I come on, we chat for a while, and then… they make me a job offer. Like I’ve already passed the technical interview stage and confirmed my skills. The thing is, I don’t even have a mega-popular GitHub page with examples of my code, and my CV is so bland it looked like I was forced to write it. The only outside indication that I’m worth something is my ability to answer technical questions, but I’m not even being asked to do that anymore.

The reason for that is simple: I wrote a couple of Habr articles and they became popular. Looks deserved and normal at first glance: since I shared my experience publicly and people have clearly appreciated it, my skills are considered “community-approved” and there’s no need for a lengthy interview.

But the articles aren’t even about my skills at all — mostly they’re there so I can whine about my depression. I mean, I’m glad I don’t have to prove anything to anyone anymore, but seriously: THAT passes for a quality developer these days? Are you out of your mind? I believe you are, and the symptoms are everywhere.
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Total votes 22: ↑17 and ↓5 +12
Comments 5

5 Robust Prioritization Techniques for IT Teams

Reading time 6 min
Views 3.4K
Is it always easy for you to prioritize the tasks of the huge project? What if five or more tasks have the main priority and urgency?

Experienced project managers and product owners know that intuition is not enough in such cases. In order to avoid missing deadlines, today, managers are able to apply useful methodologies for determining priorities, as well as modern tools that help to visualize data and not miss anything in their workflows.

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Total votes 12: ↑12 and ↓0 +12
Comments 0

Citymobil — a manual for improving availability amid business growth for startups. Part 5

Reading time 8 min
Views 1K


This is the final part of the series describing how we’re increasing our service availability in Citymobil (you can read the previous part here). Now I’m going to talk about one more type of outages and the conclusions we made about them, how we modified the development process, what automation we introduced.
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Total votes 24: ↑24 and ↓0 +24
Comments 0

7 tips how to deal with remote teams

Reading time 6 min
Views 1.7K
Originally article was posted here — 7 tips & tricks on how to deal with remote teams

A number of both large corporations and small companies having almost no staff is increasing. This is the impulse of new times that many call “uberization”. The phenomenon was named after Uber — one of the largest public-transportation companies whose drivers all are independent entrepreneurs aka freelancers. Such a structure allows Uber to work all over the planet through operating remote teams of drivers in dozens of cities simultaneously.
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Total votes 10: ↑10 and ↓0 +10
Comments 0

DO-RA: Preparing for Industrial Production

Reading time 6 min
Views 1.4K
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1. Transporting prototypes

The idea of the DO-RA project originated in March 2011 after a nuclear disaster on the Fukushima Daiichi nuclear power plant in Japan. This gadget was conceived as a personal dosimeter/radiometer working with eponymous software (DO-RA.Soft) on mobile platforms (iOS, Android, WP) as well as on desktop platforms—Windows/Linux/MacOS.

At the end of 2017, a tourist from China brought in his backpack ten long-awaited prototypes from the DO-RA.Q test batch. They were manufactured in China based on our design documents and then transported from Shenzhen to Moscow. By the way, the development of design documents was assigned to the largest Design Centre in Eastern Europe—the PROMWAD company. The documents were clear and plain—prepared in IPC format and written in proper English—to enable the automated production of electronic devices in a foreign country.
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Total votes 15: ↑14 and ↓1 +13
Comments 6

Citymobil — a manual for improving availability amid business growth for startups. Part 4

Reading time 7 min
Views 1K


This is the next article of the series describing how we’re increasing our service availability in Citymobil (you can read the previous parts here: part 1, part 2, part 3). In further parts, I’ll talk about the accidents and outages in detail.

1. Bad release: database overload


Let me begin with a specific example of this type of outage. We deployed an optimization: added USE INDEX in an SQL query; during testing as well as in production, it sped up short queries, but the long ones — slowed down. The long queries slowdown was only noticed in production. As a result, a lot of long parallel queries caused the database to be down for an hour. We thoroughly studied the way USE INDEX worked; we described it in the Do’s and Dont’s file and warned the engineers against the incorrect usage. We also analyzed the query and realized that it retrieves mostly historical data and, therefore, can be run on a separate replica for historical requests. Even if this replica goes down due to an overload, the business will keep running.
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Total votes 17: ↑16 and ↓1 +15
Comments 0

What is a coding bootcamp?

Reading time 3 min
Views 2.7K
A coding bootcamp is a program of technical training teaching the programming skills that employers are looking for. Coding bootcamps allow students with low skills to concentrate on the most significant coding aspects and apply their new coding skills to solve real-world problems.

The goal of many bootcamp coding attendants is to move into a web development career. They do this by learning to build applications at a professional level – providing the foundation they need to build applications that are ready for production and demonstrating the skills they have to add real value to a potential employer.
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Total votes 10: ↑10 and ↓0 +10
Comments 2

Citymobil — a manual for improving availability amid business growth for startups. Part 3

Reading time 8 min
Views 1.1K


This is the next article of the series describing how we’re increasing our service availability in Citymobil (you can read the previous parts here and here). In further parts, I’ll talk about the accidents and outages in detail. But first let me highlight something I should’ve talked about in the first article but didn’t. I found out about it from my readers’ feedback. This article gives me a chance to fix this annoying shortcoming.
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Total votes 23: ↑23 and ↓0 +23
Comments 0

Citymobil — a manual for improving availability amid business growth for startups. Part 2

Reading time 8 min
Views 963


This is a second article out of a series «Citymobil — a manual for improving availability amid business growth for startups». You can read the first part here. Let’s continue to talk about the way we managed to improve the availability of Citymobil services. In the first article, we learned how to count the lost trips. Ok, we are counting them. What now? Now that we are equipped with an understandable tool to measure the lost trips, we can move to the most interesting part — how do we decrease losses? Without slowing down our current growth! Since it seemed to us that the lion’s share of technical problems causing the trips loss had something to do with the backend, we decided to turn our attention to the backend development process first. Jumping ahead of myself, I’m going to say that we were right — the backend became the main site of the battle for the lost trips.
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Total votes 23: ↑22 and ↓1 +21
Comments 0

Citymobil — a manual for improving availability amid business growth for startups. Part 1

Reading time 4 min
Views 1.3K


In this first part of an article series «Citymobil — a manual for improving availability amid business growth for startups» I’m going to break down the way we managed to dramatically scale up the availability of Citymobil services. The article opens with the story about our business, our task, the reason for this task to increase the availability emerged and limitations. Citymobil is a rapid-growing taxi aggregator. In 2018, it increased by more than 15 times in terms of number of successfully completed trips. Some months showed 50% increase compared with the previous month.

The business grew like a weed in every direction (it still does): there was an increase in server load, team size and number of deployments. At the same time the new threats to service availability emerged. The company faced a task of the most importance — how to increase availability without compromising company growth. In this article, I’ll talk about the way we managed to solve this task in a relatively short time.
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Total votes 24: ↑24 and ↓0 +24
Comments 0

Estimation of VaR and ConVaR for the stock price of the Kazakhstani company

Reading time 8 min
Views 1.5K

The last decades the world economy regularly falls into this vortex of financial crises that have affected each country. It almost led to the collapse of the existing financial system, due to this fact, experts in mathematical and economic modelling have become to use methods for controlling the losses of the asset and portfolio in the financial world (Lechner, L. A., and Ovaert, T. C. (2010). There is an increasing trend towards mathematical modelling of an economic process to predict the market behaviour and an assessment of its sustainability (ibid). Having without necessary attention to control and assess properly threats, everybody understands that it is able to trigger tremendous cost in the development of the organisation or even go bankrupt.


Value at Risk (VaR) has eventually been a regular approach to catch the risk among institutions in the finance sector and its regulator (Engle, R., and Manganelli S., 2004). The model is originally applied to estimate the loss value in the investment portfolio within a given period of time as well as at a given probability of occurrence. Besides the fact of using VaR in the financial sector, there are a lot of examples of estimation of value at risk in different area such as anticipating the medical staff to develop the healthcare resource management Zinouri, N. (2016). Despite its applied primitiveness in a real experiment, the model consists of drawbacks in evaluation, (ibid).


The goal of the report is a description of the existing VaR model including one of its upgrade versions, namely, Conditional Value at Risk (CVaR). In the next section and section 3, the evaluation algorithm and testing of the model are explained. For a vivid illustration, the expected loss is estimated on the asset of one of the Kazakhstani company trading in the financial stock exchange market in a long time period. The final sections 4 and 5 discuss and demonstrate the findings of the research work.

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Total votes 13: ↑13 and ↓0 +13
Comments 0

Ambient music and its effects on writing code

Reading time 6 min
Views 2.6K
In this post I’d like to talk about our background music choices for writing code. The developer soundtrack, if you will. To narrow it down, I’m going to discuss one specific genre, ambient music.


Homo laborans and music


Today the effect music has on all living creatures, humans included, is a fairly well-researched topic. It’s been common knowledge for a while that classic music helps people to calm down and relieves stress, while high-energy tunes of various genres can make your workout results way more impressive.

Plenty of scientific papers have been published that explore this phenomenon, especially by medical researchers and psychologists (use of music as a part of treatment plan, the way different organs respond to it, etc.). Naturally, many of those you gotta take with a grain of salt as there’s always the risk of crossing the line into pseudoscience, but there’s no shortage of reliable sources that confirm that link.

You don’t need to go further than Habr to find plenty of insightful articles that talk about the influence music has on a working environment and attention span of the workers. But this particular one has a slightly different intent.
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Total votes 20: ↑19 and ↓1 +18
Comments 0