User-friendly Google Tag Manager wrapper. Improved CI/CD pipeline, did some backend/frontend improvements, security patches, feature enhancements, wrote a lot of tests, consulted colleagues.

Automotive B2C for car inspection/repair Bumped Rails version, some backend optimisation, integration with DMS APIs (poorly documented and old ones, supporting only XML)

Canadian e-commerce solution for jewelry & accessories Made reverse compatibility for an API wrapper of Tax Calculating Service (Avalara Avatax).

A publishing platform for Instagram business. Contains a browser web-version and an iOS-application The users can create the lookbooks, attach the affiliate links to the goods from the internet shop. The traffic is monetized via affiliate links purchases. The catalogs are collected as data feeds - several dozen gigabytes of text files. The necessary goods are parsed from the data feeds and are inserted into Elasticsearch. The API for ElasticSearch was developed on Phoenix. The inserting was realized by Ruby / Sidekiq, later we started using Elixir/flow.

CPA (cost-per-action) platform for monetization of mobile traffic via installing the applications from Google Play Store and App Store. The application contains a partnership platform (a browser single-page app), admin panel, payout, and referral system. There is an option to output the real-time statistics of clicks and conversions. There were no upper boundaries of the traffic, and the system was designed in order to be able to handle the growth of the traffic hundreds of times at a moment.