Denis G. — Ruby on Rails Engineer / Architect

Experience

Senior Software Developer / Team Lead / Architect

JULY 2018 - PRESENT

• Developed and maintained a hospital schedule management platform for UKG.
• Designed and built an e-commerce platform from scratch, serving as the Team Lead, managing a cross-functional team, and overseeing the architecture, development, and deployment processes.
• Implemented a goods recommendation system based on customer survey responses.
• Integrated Stripe and multiple third-party platforms for logistics, email campaigns, and gift cards.
• Connected an Elixir-based microservice with a Rails app to handle ElasticSearch data.
• Worked with IoT devices, including CCTV, security systems, and GPS trackers for bikes and pets.
• Optimized live camera streaming, improving resolution & latency.
• Worked on algorithms and logic for detecting motion in camera feeds.

Senior Ruby Developer, Excelerators

DECEMBER 2017 - JUNE 2018

• Identified and resolved service performance issues to enhance efficiency and scalability.
• Designed and implemented search functionality supporting multiple parameters for accurate and efficient results.
• Developed and optimized a sophisticated booking process to improve user experience and reliability.
• Collaborated with the product owner to gather requirements, provide updates, and ensure alignment with business goals.

Middle/Senior Ruby Developer, Svitla Systems

FEBRUARY 2014 - DECEMBER 2017

• Developed integration modules for Slack, Salesforce (worked with Apex), SharePoint, and various internal services.
• Forked the sharepoint-ruby gem, adding support for webhooks and Office 365 Video Hub.
• Implemented face detection, recognition, photo cropping, and social media sharing (Facebook, Twitter, Instagram).
• Developed scripts for migrating data from MS SQL to PostgreSQL and optimized search functionality using ElasticSearch.
• Migrated frontend design from Foundation and custom styles to Bootstrap.

Junior Ruby Developer, Interlink LLC

SEPTEMBER 2010 - FEBRUARY 2014

• Implemented design features, including sticky notes, checklists, WYSIWYG editing, canvas splitting, workspace switching, and image uploading in MeteorJS-based system.
• Integrated PayPal payment gateway.
• Developed a system for employee screening, testing, and hiring, allowing companies to create vacancies and custom questionnaires (text, multiple choice, video, and file-based questions).
• Designed and implemented a system where each company had a dedicated site (subdomain or personal domain) fetching data from a central hub via REST API.
• Built a Ruby-based server using sockets to manage Linux Apache and BIND configurations dynamically.
• Implemented functionality to sync data between multiple sites for consistency and reliability.

Education 

Cherkasy State Technological University

B.S. Software Engineering (2009 - 2011)