Andrei Kaleshka

This is a website that teaches playing musical instruments. Alone, I've managed to apply a new design to the site with a completely different stack of technologies on the front end. During the transition, the old UI and new UI worked in parallel. The transition has been made gradually to prove the new site works as expected with no business risks.

Compare the new site - https://app.worshiponline.com/ and the old site - https://classic.worshiponline.com/.

• Integrated and maintained Stripe and PayPal payment systems, the Intacct accounting system with the existing billing system, an invoicing system, and an accounting system
• Refactored a monolithic application so that it's ready for microservices architecture
• Extracted the billing domain to a separate service

SaaS application (B2C) for fast food stores and everyone.

Stack: Ruby, Grape, RESTful API, AngularJS, Cucumber, Rspec, Jasmine, RabbitMQ, PostgreSQL, Design Patterns, Twilio, Rails, Wkhtmltopdf, ImageMagick, Omni Auth, Elasticsearch, E Fax, Merchant Services, Delayed Job, TaxCloud, Amazon S3, Ansible, SSE (Server Sent Events), Google Maps API

ActivePlatform is a full-service automated cloud brokerage platform that helps cloud providers, resellers, and distributors sell, provision, bill, and manage multi-vendor cloud services (SaaS, PaaS, IaaS) through a unified system with white-label stores and automation tools. It simplifies cloud delivery, billing, subscription lifecycle, and partner networks to boost efficiency and profitability.

Stack: Rails, XML, XPath, PostgreSQL, RSpec, TDD, Scrum, APS.

A personal blog where I share my experience and unusual solutions I've invented while working on my projects. This blog helped me become an author, and I wrote a book called "Rake Task Management Essentials."

The book I wrote, Rake Task Management Essentials, is a practical guide that covers the latest techniques in building, testing, and debugging Rake tasks to solve real-world automation challenges. The book starts with a basic knowledge of Rake, allowing you to solve repetitive tasks. Then it provides information on processes performed on files, which is crucial for understanding the tool's application.

SaaS eCommerce application and order management system for commercial printers. This is a B2B2C platform developed from scratch. The clients of the app could order printing products from suppliers. The suppliers could manage the orders via the system and send using delivery services such as FedEx/UPS/USPS.

Stack: Ruby, Rails, Active Merchant, FedEx/UPS/USPS, jQuery, Ajax, RSpec, MySQL.

Fisikal is a smart fitness and wellness platform focused on physical health, movement tracking, and performance improvement, helping users stay active, strong, and balanced through data-driven insights.

Stack: Ruby, Rails, jQuery, Ajax, SMS gateway, RSpec, MySQL.

This is a very basic implementation of enums in Ruby. The cornerstone of the library is safety. The library was extracted out of Mezuka project I've been worked on before. We faced tech limitations while developing Mezuka and that make us to implement this Ruby extension on our own.

This gem extends Ruby on Rails to make the development environment more comfortable. It allows you to safely write data migration code alongside standard Rails schema migrations in the same file, in a maintainable way.

I designed and developed this gem on my own to improve our team productivity when we had constant failures during database migrations. It allowed us to save tens of hours in total as a team weekly by preventing the issues with migrations.

As of now, the gem has been downloaded around 3,000,000 times.

Contributed to a variety of open-source projects across the Ruby and Rails ecosystem, including GetOrBuild, Redmine S3, LocomotiveCMS, Twitter Bootstrap Rails, Devise, InheritedResources, Rails, MultiXML, DataGrid, couchbase-ruby-model, and others. Contributions included bug fixes, feature enhancements, documentation improvements, and community support, helping to advance the functionality, stability, and adoption of these widely used libraries and frameworks.

I originally created this gem to boost my own productivity, and it now saves me up to 5 hours per week when working on Rails applications.

actual_db_schema is a Ruby gem for Rails that ensures your database schema remains consistent when switching between branches during development. It automatically detects and rolls back “phantom” migrations - those that were run in another branch but don’t belong to the current one - preventing errors and eliminating irrelevant diffs in schema.rb or structure.sql. I developed this gem entirely on my own as a unique solution with no analogues.

To date, it has been downloaded around 500,000 times.