Oleksii Neishchenko

Over 11 years of experience as a Ruby on Rails developer. I was involved in all development activities from building from scratch to supporting large projects with legacy code. I've worked in various industries, such as SaaS, fintech, startups, eCommerce, etc.

Full-stack Ruby on Rails Developer at Dominion Capital (2025-05 – Present)

• Developed and supported internal RoR projects in the Fintech sector
• Developed a system for launching and managing background tasks from the front end (via a browser)
• Migrated lots of pages and components from Bootstrap 3/4 to Bootstrap 5

Software Engineer (contractor) at Rail Europe (2024-11 – 2025-01)

• Developed new functionality and supported the existing one

Full-stack Ruby on Rails Developer (contractor) at Fitjourney.ai (2024-03 – 2024-07)

• Developed the backend part of the Ruby on Rails application
• Implemented integration with WhatsApp via 360dialog

Crystal Backend Developer (contractor) at Kagi (2023-11 – 2024-03)

• Implemented integration with Brave search engine and Two-factor authentication

Tech Lead / Ruby on Rails Backend Developer at clevergig (2020-08 – 2023-10)

• Developed new functionality and supported the existing one
• Integrated third-party APIs (Google Maps API, SDB Groep, AFAS, Chargebee)
• Optimized SQL queries, RoR controllers and other Ruby code to speed up the application
• Explained technical trade-offs of different approaches to stakeholders

Ruby on Rails Backend Developer at SidelineSwap (2019-05 – 2020-07)

• Developed and maintained the backend part of the Ruby on Rails application

Ruby/RoR Backend Developer at DataCraft (2017-04 – 2019-04)

Developed and supported data collection and analysis service (detection of the queue in the store by screenshots, registration of care and arrival of employees to work, simple CCTV system). Usual load is 20k rpm. Peak load 80k rpm

Ruby on Rails Backend Developer at WeAreBrain (2015-07 – 2017-03)

• Mainly developed new Ruby on Rails functionality
• I also worked on some small temporary projects. I can mention a project on the Yii framework and MongoDB