We're Proud of Our
Many High Quality Apps

Over the years, we have created a number of high-quality apps using Ruby on Rails, React, Angular, Node, and other technologies.
Our team has worked on and contributed to various mobile and web development projects.


Client: Squire Our role: Project lead, front-end development in ReactJS Technologies: NodeJS, ReactJS, iOS native Location: San Francisco, New York Y combinator

Squire helps users discover barber shops based on their location. It checks the availability and helps the user to reserve a timeslot. Paying for the service is pretty easy and done in the app.

The biggest challenge with creating Squire was to build the project in three different technologies and combine them in one meaningful, production-ready product. We have managed to overcome this challenge and the results were amazing - the app ended up featuring over 1,000 shop owners. The success has not gone unnoticed, the app is featured in Techcrunch magazine.

GetSquire screenshot 1
GetSquire screenshot 2


Client: O.School Our role: Development team Technologies: Ruby on Rails, Ruby, API Location: San Francisco Raised A series

A vrtual classroom app, based on live streaming technology and moderated chat. O.school is a one of a kind software that touches a slightly sensitive topic.

We always remember creating O.school with great joy, especially the collaboration with Andrea, the CEO. After development, 800 000$ was raised to help achieve its goal. The success was also feautred in Techcrunch magazine.

BagIQ screenshot
BagIQ mobile screenshot


Client: Boardspan Our role: Interim CTO, Full tech team Technologies: Ruby/Rails, JavaScript, 3rd party integrations Location: San Francisco 98% test coverage, high reliability

This is a Ruby on Rails application that brings everything your board needs in one place. It has a number of 3rd party integrations, document synchronization and company feeds integrated in. Company feeds integrated in close collaboration with IBM and Intel.

The groundbreaking Online Board Search and High Service Consulting are the two most time- and cost-efficient ways to build your board. It’s not only easier…it’s smarter. Nowadays, many companies use Boardspan, including the USA Olympic team.

BagIQ screenshot
BagIQ mobile screenshot


Client: Displet Our role: Development of the app Technologies: Ruby, Amazon AWS Location: Dallas, Texas

Real Estate search API built in Ruby on Rails along with administration console. API provides search results for whole Texas state and bayond.

DB has 70 Milion records in database of rental properties, properties for sale and sold apartments. Each month it imports 2 million new records of data, and everything is handeled with Amazon multi server enviroment along with read replicas of the DB.

Displet screenshot
Displet code


Client: Wrap Our role: Extension of the team in San Francisco Technologies: AngularJS, Ruby, Ruby on Rails, Android Location:San Francisco Raised B round

Mobile engagement technology for deepening relationships, improving loyalty and driving commerce. Tell your story, provide service, or sell products right in the messaging feed. All with no programming, no waiting, and no apps to download.

Working on Wrap was inspiring, to say at least. The Wrap was a big startup that raised Series B funding. At the time we were working together, Kolosek team had a chance to partner up with around 100 people from the San Francisco office.

Wrap screenshot 1


Client: NBC News channel Our role: Extension of the NewYork based team Technologies: AngularJS, Ruby, Ruby on Rails, Android Location:San Francisco

An NBC News channel app for live streaming/recoding from smart phone. Stream your world real-time with live video from anywhere to audiences everywhere. It is built to support millions of users.

Just like in the case of astrology.com, Kolosek team was an extension of the team in New York. Our partnership was even better than the first time.

In the end, StringWire has proved to be a huge success! Actually, it was used until the Periscope from Twitter took the lead, in the same field.

StringWire screenshot 1


Client: NBC News Our role: Extension of the NewYork team Technologies:Ruby, Ruby on Rails, API Location:San Francisco In production for 10+ years, acquired

AAstrology is an NBC News Channel app that has been in the production for 10+ years. It’s unique design and fail-safe feature got this product to be sold after 3 years of our collaboration with the team in New York.

Working as an extension of a New York-based team was a great experience! Cooperating with the team was easy and both team’s creativity came to life.

Astrology was a huge step forward for Kolosek. After the successful acquisition of the app, we have partnered with NBC News channel to work on next big project - StringWire.

StringWire screenshot 1
StringWire screenshot 2


Client: GrandConsulting Our role: Tech lead, 100% development Technologies:Ruby, Ruby on Rails, Sockets, API Location:San Francisco Rapid development principle

Teletale is a private, enterprise application for in-house handling incoming calls from customers. It has numerous features that can help the business: integrated payment tracking, integrated payment billing, live call recording and many others.

Creating Teletale was a bit challenging. However, we managed to develop full-blown production ready app in 1 month. How? Thanks to Rapid Development approach. We clearly remember that the client's response was just "Well damn, I didn't expect that!". It has been in production since the very first day it was sent to the client.

Private app

StringWire screenshot 1
StringWire screenshot 2

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