4xxi

World-class Technology partner

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We are big on creating eminently successful businesses -  🖥 products we have developed from scratch so far have raised in excess of 💰$495,000,000 in funding!

🙅‍♂️ No one failed projects

In addition, we were named as 👨‍🔬 "Best & innovative development company on the market" (c) RBC

Plus, we became🏅"Top #2 Web Development Company in the world" (c) Manifesto

Under-the-hood:

  • ⏳ 11+ years on the global markets (🇺🇸, 🇬🇧, 🇻🇬, Asia, Eastern & Western Europe)
  • 🗞 Publications in TechCrunch, Forbes, Business Insider, NY Times, Wired
  • 🏪 HQ in London and plans for 🗺 New York and San-Francisco during next year
  • 🚀 90+ unparalleled projects we are proud of
  • 🏂 80+ developers, you can leverage (most of them are seniors)
  • 🧗‍♀️ Own awesome Startup Competitions in London in partnerships with WeWork, Barclays, F6S, 11FS, Capital Enterprise, VCs
$50 - $99/hr
50 - 249
2008
Locations
United Kingdom
99A Gagarina street, London, London 430027
+79602516041
United Kingdom
8 Devonshire Square, Spitalfields, London, London EC2M 4PL
+442039174556

Focus Areas

Service Focus

40%
35%
25%
  • Web Development
  • Mobile App Development
  • Software Development

Client Focus

40%
40%
20%
  • Medium Business
  • Small Business
  • Large Business

Industry Focus

25%
20%
20%
10%
10%
10%
5%
  • Financial & Payments
  • Education
  • Healthcare & Medical

4xxi Executive Interview

Evgeny Scherbak
Evgeny Scherbak
VP of Product
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Please introduce your company and give a brief about your role within the company?
4xxi is World-class technology partner & Startup Launcher based in London with 3 international development hubs. My role as VP of Product includes business development and branding on the global market.
What was the idea behind starting this organization?
Developing high-end apps using cutting-edge technologies. Help startups to build the apps from scratch, improve the product itself, pack the product market fit for various international markets, connecting with VCs and angels for raising money. And go through this journey hand-in-hand with our startups as a partner.
What are your company’s business model–in house team or third party vendors/ outsourcing?
In-house only.
How is your business model beneficial from a value addition perspective to the clients compared to other companies' models?
We add not only “coding” value but the production value as well. Applying our unparalleled expertise of the industries we involved in (see above - we help companies to develop the apps from scratch, improve the product itself, pack the product market fit for various international markets, and also connecting with VCs and angels for raising money).
What industries do you generally cater to? Are your customers repetitive? If yes, what ratio of clients has been repetitive to you?
FinTech, EdTech (Education), MedTech (Healthcare).
95% of our customers are repetitive and recommend us to others.
Mention the objectives or the parameters critical in determining the time frame of developing a mobile app.
OS versions that need to be supported, design deviations from the given guidelines, number of effects and complex design elements, work with the server (API).
How much effort in terms of time goes into developing the front end and back end of a mobile app?
As we use native development platforms, there is no fundamental difference in the efforts.
What are the key parameters to be considered before selecting the right platform for a mobile application?
It is necessary to use those development platforms that are enormously supported by the OS manufacturer.
Which platform do you suggest your clients to begin with when they approach you with an idea (Android or iOS) and why?
Native development, of course, because it provides full access to the OS's development tools.
Android or iOS, Native or Hybrid — which platform is best to use to build your app? What are your recommendations?
We recommend the development of MVP on Android, since Android allows you to distribute test builds faster and more importantly, it also depends on what the application is used for.

We advice leveraging only on native development (for high-end products). Hybrid development does not allow using all the features of the OS, and requires native development for the functionalities that the hybrid platform does not provide.
What are the key factors that you consider before deciding the cost of a mobile application?
OS versions that need to be supported, design deviations from guidelines, number of effects and complex design elements, working with the server (API).
What kind of payment structure do you follow to bill your clients? Is it Pay per Feature, Fixed Cost, Pay per Milestone (could be in phases, months, versions etc.)
We are quite flexible here, and payment structure can be agreed depending on the client`s vision or product form. For instance, if we are talking about MVP / Prototype development we usually suggest the scheme with 30% prepayment only and 70% after we develop everything, deploy, release and being accepted by the client. Otherwise, the client pays nothing (but it had never happened).
The payment structure could be presented as Time & Material, Team-Based, Phases-based with monthly invoicing and so on. To be honest, it doesn`t matter a lot.
Do you take in projects which meet your basic budget requirement? If yes, what is the minimum requirement? If no, on what minimum budget you have worked for?
$10,000 is the minimum budget of the project we take.
What is the price range (min and max) of the projects that you catered to in 2018?
The price range we catered in 2018 was from $10,000 to $450,000.
Which business model do you suggest to your clients enabling them to generate revenue from mobile applications? Why?
There is no monosyllabic answer here. It greatly depends on the product goal(s), country and countless other aspects. It could be Advertising - e.g., VICE
Commerce and Retail - e.g., Warby Parker
Transactional Services - e.g., Uber
Subscriptions - e.g. Salesforce
Marketplace - e.g., Etsy
Usage Fee - e.g., T-Mobile pre-paid
Service fee per unit - e.g., most of the Development agencies
Rental or leasing - e.g., Zipcar Licensing
Auctions - e.g. eBay
Data - e.g., Duedil
Transaction processing - e.g., Stripe
App downloads - e.g., Minecraft
In-app purchases - e.g., Clash of Clans, etc
We can work with every mobile apps` revenue model.

4xxi Clients & Portfolios

AdvisorEngine
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AdvisorEngine
  • AdvisorEngine screenshot 1
$500000+
100 weeks
Financial & Payments

Service for financial advisers that enables total automation of their work, from opening an account for a client and signing documents, to creating a portfolio and working on it by using mathematical and economic modeling. The service has a high level of integration with leading financial organizations.

FinTech, StartUp

What we did: Website, Backend, Frontend

To see more, click here: https://4xxi.com/en/project/advisorengine

Trivago
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Trivago
  • Trivago screenshot 1
$50001 to $100000
69 weeks
Other Industries

Service for holding automated video interviews at Trivago. Candidates fill out the form step by step and reply to questions (in written form or video), and then the result is sent to the corporate HR system.

HR

What we did: Website, Backend, Frontend

To see more, click here: https://4xxi.com/en/project/trivago 

Loji
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Loji
  • Loji screenshot 1
$10001 to $50000
70 weeks
Consumer Products

LOJI is an iMessage extension which lets users search and forward different places with complete information (address, telephone, website) direct to iMessage in the form of interactive icons.

StartUp, Entertaiment

What we did: Backend, iOS App

To see more, click here: https://4xxi.com/en/project/loji

Charge.Auto
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Charge.Auto
  • Charge.Auto screenshot 1
$50001 to $100000
72 weeks
Business Services

In-house production of electric trucks with modular assembly that allows for bespoke construction for each client. We have developed a companion app for use on Android for the Charge.Auto project. The app is used by truck drivers to check the vehicle's systems, and for submitting reports about technical performance tests at the start and end of each working day. The automated system for data retrieval from monitors allows the driver to stay abreast of potential problems with the vehicle. The companion app has an important feature, which is a smart system for automatic authorization of the app and the vehicle by means of an exchange of encrypted keys with no human input. When working normally, the app tracks the status of orders and the route, thus making it operationally possible to update on any changes in orders, either from the system or the driver.

Tech, Electric Cars

What we did: Android App

To see more, click here: https://4xxi.com/en/project/charge-auto

Centrallo
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Centrallo
  • Centrallo screenshot 1
$100001 to $500000
100 weeks
Utilities

Centrallo is an app to create notes and lists for organized individuals. It enables intelligent organization of information, as well as sharing of info with others and joint work. Any content can be added to Centrallo - from photos and video to hyperlinks for Dropbox, Google Drive & OneDrive. The service works on leading mobile platforms, on Apple Watch and Android Wear.

StartUp, Productivity

What we did: Website, Backend, Frontend, iOS App, Android App, Watch App, Android Wear

To see more, click here: https://4xxi.com/en/project/centrallo

Nutmeg Aspirin
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Nutmeg Aspirin
  • Nutmeg Aspirin screenshot 1
$10001 to $50000
48 weeks
Healthcare & Medical

Nutmeg Aspirin - is a media portal where people discuss their stories of healing, share natural remedy recipes that they have tested themselves, simply ask each other for help or give advice to others unable to deal with their own health problems themselves, or for people who just want to look and feel better. A unique design was developed for the site, as well as a user interface which enables simple creation, comment and review of articles and questions.

Мedia, Healthcare, StartUp

What we did: website, backend, frontend

To see more, click here: https://4xxi.com/en/project/nutmeg-aspirin

Industry Index
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Industry Index
  • Industry Index screenshot 1
$50001 to $100000
100 weeks
Advertising & Marketing

Industry Index is a catalogue of companies with current evaluations from leading marketing experts. Combining expert and consumer evaluations, this project makes it possible to pinpoint someone to implement practical marketing or IT challenges.

AdTech, StartUp

What we did: Backend, Frontend

To see more, click here: https://4xxi.com/en/project/industryindex

Auditarium
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Auditarium
  • Auditarium screenshot 1
$50001 to $100000
24 weeks
Business Services

Online auditor marketplace. Helps audit companies and auditors find each other with ease. There is a system of tenders in place for the publication of contracts and the possibility of selecting the best practitioners. Integration with the website of the Russian Finance Ministry makes it possible automatically to identify and confirm the experience and skills of the auditors.

StartUp, Marketplace

What we did: Website, Backend, Frontend

To see more, click here: https://4xxi.com/en/project/auditarium

PayQR
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PayQR
  • PayQR screenshot 1
$10001 to $50000
16 weeks
Financial & Payments

PayQR is an app that enables payment of bills, purchases and invoices with the use of QR codes. Once the app has been downloaded and the user's bank card has been added, it only takes one click to pay utility bills or buy a cup of coffee in a cafe.

FinTech, StartUp

What we did: Android App

To see more, click here: https://4xxi.com/en/project/payqr

Woolmark Prize
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Woolmark Prize
  • Woolmark Prize screenshot 1
$10001 to $50000
10 weeks
Media

Promo site for the International Woolmark Prize competition. With the help of a unique visual algorithm, developed specifically for this project, users create and promote derivative works based on 12 pieces by leading designers.

Promo

What we did: Website, Backend, Frontend

To see more, click here: https://4xxi.com/en/project/woolmark-prize

Onefit
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Onefit
  • Onefit screenshot 1
$50001 to $100000
40 weeks
Consumer Products

Onefit is a subscription membership of thousands of fitness clubs. The user purchases a monthly subscription, after which he or she is able to become a member of any of the clubs that belong to Onefit with no additional payment. The service operates in Moscow and St Petersburg.

StartUp, Fitness

What we did: Website, Backend, Frontend

To see more, click here: https://4xxi.com/en/project/onefit

Well
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Well
  • Well screenshot 1
$0 to $10000
12 weeks
Healthcare & Medical

Well is Uber for doctors. The service allows for the automation of the system for putting together a doctor's schedule, with appointments, payments and reports.

MedTech, StartUp

What we did: Website, Frontend, iOS App

Newtonew
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Newtonew
  • Newtonew screenshot 1
$100001 to $500000
100 weeks
Media

Newtonew is an information media project about education, and addressing the most relevant and useful concepts, theories and methodologies as well as techniques and research, goods and services. We talk about how education and science are developing and changing today, and what they may become in the near future. Only the most important and interesting.

EdTech, StartUp

What we did: Website, Backend, Frontend, iOS App

To see more, click here: https://4xxi.com/en/project/newtonew

Sprut
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Sprut
  • Sprut screenshot 1
$10001 to $50000
32 weeks
Advertising & Marketing

Management system for pools of commercial posts on the My World social network from Mail.ru. Integration between api mail.ru and CPA ad1 system allows to create ad posts and send them to the advertising slots in the social network, targeted according to audience and an intellectual algorithm to determine the number of displays for the optimum financial return.

CRM, CPA Systems

What we did: Website, Backend, Frontend

To see more, click here: https://4xxi.com/en/project/sprut

IFMO — Game of light
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IFMO — Game of light
  • IFMO — Game of light screenshot 1
$0 to $10000
12 weeks
Education

Interactive Physics Olympiad that gives winners privileges when applying to ITMO University

EdTech

What we did: website, backend, frontend

To see more, click here: https://4xxi.com/en/project/ifmo-game-of-light

WorthFM
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WorthFM
  • WorthFM screenshot 1
$100001 to $500000
72 weeks
Financial & Payments

WorthFM is a platform for normal users to save and invest financial resources. Through a simple set of steps, WorthFM makes it possible to open a bank account, transfer money, select the optimum portfolio and receive investment revenue. The service also enables pension tax rebates. The whole process is automated from start to finish.

FinTech, StartUp

What we did: Website, Backend, Frontend

To see more, click here: https://4xxi.com/en/project/worthfm

4xxi Reviews

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Emily Jipson

Top development team

Rating Breakdown

  • Quality
  • Schedule & Timing
  • Communication
  • Overall Rating

Project Detail

$10001 to $50000

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Review Summary

4xxi has been a great partner to WorthFM. I appreciate how they've grown with us, providing services ranging from in-depth architectural support to design. The project manager is the best I've ever worked with, understanding our business needs and helping craft technical specs that allowed for a seamless product development execution.

What service was provided as part of the project?

Web Development

What is it about the company that you appreciate the most?

Excellent partnership and commitment to quality

Konstantin Seregin

Review for 4xxi

Rating Breakdown

  • Quality
  • Schedule & Timing
  • Communication
  • Overall Rating

Project Detail

Completed

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Review Summary

What was the project name that you have worked with 4xxi?

App Development Project

What service was provided as part of the project?

Mobile App Development

Michael Sher

Amazing to work with. Super smart. Super responsive.

Rating Breakdown

  • Quality
  • Schedule & Timing
  • Communication
  • Overall Rating

Project Detail

$200000+

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Review Summary

Blessed that I found them almost 5 years ago! Just paid my 47th invoice and happy to pay them. Quality work. Quality people. Quality everything. We are NYC based and the time difference works perfectly for us.

What service was provided as part of the project?

Mobile App Development, Software Development

What is it about the company that you appreciate the most?

Speed. Quality of product. Responsiveness. Energy. Passion. Brains. Ability to quickly find quality candidates to fill various positions when we need to expand the development team.

What was it about the company that you didn't like which they should do better?

Nothing, honestly.

Mara Berkman Landis

4xxi Exceeded Expectations

Rating Breakdown

  • Quality
  • Schedule & Timing
  • Communication
  • Overall Rating

Project Detail

$10001 to $50000

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Review Summary

A friend recommended 4xxi to build a business website. Working with them was extremely professional. They are honest and deliver a great product. They custom built a high functioning, fantastic site. They came in on budget and on time. And they are always available for any tweaks or fixing glitches. Response time is almost immediate. They also brought many ideas to the table that we implemented. They offered their opinions based on experience rather than just implementing what we wanted. Their advice was greatly appreciated.

What service was provided as part of the project?

Web Development

What is it about the company that you appreciate the most?

Easy to work with, extremely reliable and delivers.

What was it about the company that you didn't like which they should do better?

They are Russian. THey speak English but may not catch typos!

David Nadezhdin

Woolmark Prize

Rating Breakdown

  • Quality
  • Schedule & Timing
  • Communication
  • Overall Rating

Project Detail

$10001 to $50000

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Review Summary

We wanted to create a promotional site for the international competition Woolmark Prize with a unique visual algorithm by which our users could create and promote derivative works based on 12 pieces by leading designers. The challenge was to launch the website in very limited time.
The project started in December 2015 and was completed in 1 month. The project was delivered on time!

What service was provided as part of the project?

Web Development

What is it about the company that you appreciate the most?

We just provided 4xxi the concept of the project and the designs. We needed: a website (backend and frontend) + server infrastructure setup & support. Due to the limited time we had a lot of calls to finalize the scope.