Oleksii Neishchenko
@oleksiineishchenko
Ruby on Rails developer focused on fast APIs, reliable processes, and seamless third‑party integrations.
What I'm looking for
I’m a Ruby on Rails developer with over 11 years of experience, involved in everything from building systems from scratch to supporting large projects with legacy code. I’ve worked across SaaS, fintech, startups, and eCommerce, consistently owning features end-to-end.
My three biggest wins are establishing processes for code reviews, bug tracking, and code ownership; optimizing Ruby on Rails API endpoints—response time dropped from 90–120 seconds to 1–2 seconds; and integrating multiple third-party APIs (Google Maps, Chargebee, WhatsApp via 360dialog, Brave search, SDB Groep, AFAS).
Recently at FastCTO, I developed and supported internal Rails projects in the fintech sector, built a system to launch and manage background tasks from the front end, and migrated pages/components from Bootstrap 3/4 to Bootstrap 5. Previously, as clevergig Tech Lead / Ruby on Rails Backend Developer, I integrated key APIs and optimized SQL queries, Rails controllers, and Ruby code while explaining trade-offs to stakeholders.
I’m comfortable working with a broad stack—Ruby, Ruby on Rails, Sinatra, multiple databases, Sidekiq/Solid Queue for background work, and modern UI tooling like Stimulus and ViewComponent. I also bring deep performance and systems thinking from building data-collection services and even earlier server administration experience.
Experience
Work history, roles, and key accomplishments
Full-stack Ruby on Rails Developer
Fitjourney.ai
Mar 2024 - Jul 2024 (4 months)
Built the backend for a Ruby on Rails application and integrated WhatsApp via 360dialog. Delivered backend features using queues and search indexing.
Crystal Backend Developer
Kagi
Nov 2023 - Mar 2024 (4 months)
Implemented Brave search engine integration and two-factor authentication. Developed backend functionality using Crystal and supporting data services.
Education
Degrees, certifications, and relevant coursework
Oleksii hasn't added their education
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Tech stack
Software and tools used professionally
Availability
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