- Contributed to the development and support of a Governance, Risk, and Compliance (GRC) product. - Engineered web applications, monitored error alerts, and facilitated product ownership transition during company acquisition. - Developed new backend microservices, migrating from Ruby on Rails to a modern stack including AWS Lambda, Serverless, TypeScript,.- Executed End of Life (EOL) upgrade of the Rails monolith (>1kk LOC), resolving dependencies, deprecations, and test issues.- Refactored over 15 database resources with implicit dependencies for the Year API Restructure Initiative.- Delivered new UI and API functionality across GRC Audit submodules, ensuring backward compatibility for multiple API versions.- Addressed production bugs, reducing SQL query latency from 40-50s to <1s and resolving critical memory overflow issues.- Conducted weekly monitoring and bi-daily production deployments using DataDog, CloudWatch, and AirBrake.- Led the CKEditor migration, updating and integrating a new custom Ruby gem with npm package.- Overhauled Rails HTML ERB module, migrating to a new React micro-frontend, enhancing UI/UX.- Implemented a lightweight DSL for optimizing lazy loading of ENV variables for Doctor rake tasks.- Improved Ruby codebase through continuous refactoring of gems and Rails monolith sections.

- Contributed to a 6-member development team at a B2B startup specializing in e-commerce price optimization.- Developed new business logic and managed the full development cycle across server and client sides, improving delivery efficiency by 60%.- Integrated partner APIs within a Ruby microservice, implementing a caching system and organizing parallel API fetching to achieve up to 200 RPS(api limit).- Optimized resource utilization (servers, databases, queues) and resolved urgent production bugs.- Refactored key server-side modules, improving code extensibility and readability.- Migrated 40% of the client application UI from Vue.js 2 to Hotwire, completing the transition by July 2021 despite Hotwire's pre-release status.

During my initial period in the Czech Republic, I actively engaged with the local Russian-speaking diaspora, contributing to the development of various projects and support services. Some notable endeavors include:- Developed multiple auxiliary Telegram bots tailored for students and applicants.Implemented a hierarchical role system using technologies such as CanCanCan and AASM.Utilized Delayed Job on Sidekiq and integrated with various APIs, including the private API of a local university.- Designed and developed a CRM system for several local commercial organizations offering support to foreigners.Created a RESTful Ruby on Rails API (leveraging ActiveAdmin and PostgreSQL).Implemented a Telegram client using Ruby for enhanced communication and coordination.- Engineered a scraper dedicated to monitoring visa statuses on the Czech Ministry of Interior's website.Implemented a RESTful Ruby on Rails API with Redis for caching, PostgreSQL as the primary database, and Sidekiq for background job processing.