4xxi

4.95/5 (5 Reviews)

Web and mobile development

4xxi is a world-class web & mobile development company helping Startups, SMB and Enterprises to solve their business problems, accomplish goals, increase revenues and cut costs. We change industries. And even people's lives. We have a deep product exp ... Read more

$25 - $49/hr

Russia, Russia

50 - 249

2008

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4xxi

4.95/5 (5 Reviews)

Web and mobile development

Visit Website

Write a review of 4xxi

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Top development team

Reviewed on 19/9/17 by Emily Jipson

Role: General Manager & Chief Product Officer at WorthFM

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 do you like most about the company?

Excellent partnership and commitment to quality

Rating breakdown

Quality

Reliability

Ability

Overall

Services:

Web Development

Project Budget:

$10001 to $50000

Project Duration:

52 Weeks

Project Status:

In progress

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Review for 4xxi

Reviewed on 30/8/17 by Konstantin Seregin

Rating breakdown

Quality

Reliability

Ability

Overall

Services:

Mobile App Development

Project Status:

Completed

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Amazing to work with. Super smart. Super responsive.

Reviewed on 24/8/17 by Michael Sher

Role: Founder at Groupdolists

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 do you like most about the company?

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 they should improve on?

Nothing, honestly.

Rating breakdown

Quality

Reliability

Ability

Overall

Services:

Mobile App Development

Project Budget:

$200000+

Project Duration:

100+ Weeks

Project Status:

In progress

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4xxi Exceeded Expectations

Reviewed on 22/8/17 by Mara Berkman Landis

Role: Founder at NutmegAspirin.com

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 do you like most about the company?

Easy to work with, extremely reliable and delivers.

What they should improve on?

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

Rating breakdown

Quality

Reliability

Ability

Overall

Services:

Web Development

Project Budget:

$10001 to $50000

Project Duration:

8 Weeks

Project Status:

In progress

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Woolmark Prize

Reviewed on 9/8/17 by David Nadezhdin

Role: Co Founder, CEO at SIG.NUM

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 do you like most about the company?

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.

Rating breakdown

Quality

Reliability

Ability

Overall

Services:

Web Development

Project Budget:

$10001 to $50000

Project Duration:

12 Weeks

Project Status:

Completed

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Company Executive Interview

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.

Evgeny Scherbak, VP of Product, 4xxi

Read Full Interview

Services

Custom Software Development
Mobile app development
Web development

About 4xxi

4xxi is a world-class web & mobile development company helping Startups, SMB and Enterprises to solve their business problems, accomplish goals, increase revenues and cut costs.

We change industries. And even people's lives.

We have a deep product expertise in FinTech, EdTech and MedTech industry. Also we can create and like products with Big Data, Artifical Intelligence and Machine Learning. There are more than 80 excellent global projects in our portfolio, most of them regularly get publications in Forbes, TechCrunch, New York Times, Yahoo, Business Insider etc.

We are a certified partner of SensioLabs.

Our concise technology stack:
Symfony / PHP / PostgreSQL / MySQL / MongoDB / Redis / RabbitMQ / React / Redux / PostCSS / Ruby / Rails etc.

Key Clients

Trivago, Centrallo, AdvisorEngine, WorthFM, Charge.Auto, Loji, Bell, Megafon, Kinder, Gillette, Well, PayQR, NutmegAspirin, Newtonew, etc.

Focus Area

Services

Client Focus

Industry Focus

PORTFOLIO

Financial & Payments

AdvisorEngine

$500000+