Rails Development Directory

Spark Solutions

We are your Ruby on Rails & Spree Commerce Developers

We build great apps for heavy loads, work agile & across multiple time zones.

We're experts in building e-commerce solutions, online marketplaces and heavy load applications with great interactive interfaces.


Warsaw, Poland

Number of Employees



  • Web/Visual/Interface Design
  • API Integration/Development
  • Training/Coaching/Mentoring
  • Code Review/Audits
  • User Experience/Usability
  • Mobile/iPhone Development
  • Ruby on Rails Development



New polish marketplace – eBay/Amazon mix, with multiple external vendors/merchants.

- marketplace build on top of Spree Commerce e-shop system with multiple sellers
- over 1 million SKUs
- one checkout – one payment – multiple sellers, multiple shipments
- every partner can have multiple self-delivery points, accept automatic payments and customize his shop
- public API for partners
- Ceneo XML parser with variants support

Technology stack:
- Spree Commerce
- Ruby on Rails
- ReactJS, Flux, CoffeeScript
- HTML5, Sass, Bootstrap
- Redis
- Memcached
- Apache SOLR
- Amazon S3
- Varnish, Nginx, CloudFlare

- Przelewy 24 payment gateway
- inPost Paczkomaty API
- Facebook API
- Google Maps API
- inFakt API (invoicing)
- Zendesk
- Sendgrid

Project completed in 2015
Program Kariera Facebook Application

Contest application on top of Facebook platform with extensive use of FB Grap API (login/signup, notifications, synchronization of content, sharing open graph objects) created for Program Kariera intern program of biggest polish employers (Amica, Bakalland, mBank, PZU and more).

Technology stack:
- Ruby on Rails
- CoffeeScript
- HTML5, Sass, Bootstrap
- PostgreSQL
- Redis
- Memcached
- Amazon S3
- Heroku

Project completed in 2015

GameTrade.pl is a leader in used games market in Poland and one of the most popular gaming websites in the country. Prototype of this app (used as a private beta) was built in less than one month. GameTrade.pl won Aulery 2010 contest for best Polish startup and raised 2 rounds of financing from local Seed/VC funds.

Website now generates over 1 million visits and 10 millions of page views / month with over 250 000 registered active gamers who swapped and sold over 400 000 games through the service.

Technology stack:
Ruby on Rails
JavaScript & jQuery
HTML5, CSS3, responsive web design

Google Maps API (geolocalization of users and their offers)
Facebook Open Graph API (login/signup, notifications, open graph collections)
inFakt API (invoicing)

We’ve also built server infrastructure for GameTrade.pl with multiple layers of caching, optimization and load balancing.

Project completed in 2013