Remote: Yes (UTC+2, flexible)

Willing to relocate: No

Technologies: Ruby on Rails, PostgreSQL, MySQL, Sidekiq, Solid Queue, Redis, HotWire, Stimulus, ViewComponent, Tailwind, RSpec, AWS, Linux. Some Crystal from contract work at Kagi. Claude Code daily.

Résumé/CV: https://www.linkedin.com/in/oleksii-neishchenko-44a23893/

GitHub: https://github.com/alexneisc

Email: oleksii@ilikegoodcode.com

Senior Ruby on Rails developer, 11+ years across fintech, SaaS, e-commerce, and startups. Open to full-time remote or contract. What I'm best at: Performance work on existing codebases. Once optimized a set of Rails API endpoints from 90-120s down to 1-2s — measuring first, raw SQL where ActiveRecord produced bad queries, indexing, restructuring background jobs. External API integrations (5+ over my career: Google Maps, Chargebee, WhatsApp via 360dialog, SDB Groep, AFAS). Comfortable with the messy parts — retries, idempotency, webhook ordering, partial failures. Working with legacy and tests-nobody-touches. Reading before writing, refactoring without breaking things. As Tech Lead at clevergig (Dutch SaaS) for 3 years, I set up code review, bug tracking, and ownership processes for a long-lived codebase.

Recent stops: FactCTO (fintech), Rail Europe, Fitjourney.ai, Kagi (Crystal backend), clevergig (Tech Lead).

For fun: building a Rails app + ESP32 device that tracks power outages at my home — the device pings the API every minute, the Rails side aggregates into hours-with-power vs. without. Started during the post-2022 outages in Kyiv and kept evolving — a good way to keep Rails fresh and combine backend with a bit of hardware.

Senior Ruby on Rails developer, 11+ years across fintech, SaaS, e-commerce, and startups. Open to full-time remote or contract. What I'm best at:

Performance work on existing codebases. Once optimized a set of Rails API endpoints from 90-120s down to 1-2s — measuring first, raw SQL where ActiveRecord produced bad queries, indexing, restructuring background jobs. External API integrations (5+ over my career: Google Maps, Chargebee, WhatsApp via 360dialog, SDB Groep, AFAS). Comfortable with the messy parts — retries, idempotency, webhook ordering, partial failures. Working with legacy and tests-nobody-touches. Reading before writing, refactoring without breaking things. As Tech Lead at clevergig (Dutch SaaS) for 3 years, I set up code review, bug tracking, and ownership processes for a long-lived codebase.

Recent stops: FactCTO (fintech), Rail Europe, Fitjourney.ai, Kagi (Crystal backend), clevergig (Tech Lead).

For fun: building a Rails app + ESP32 device that tracks power outages at my home — the device pings the API every minute, the Rails side aggregates into hours-with-power vs. without. Started during the post-2022 outages in Kyiv and kept evolving — a good way to keep Rails fresh and combine backend with a bit of hardware.

Hi! I am Oleksii from Ukraine. I am looking for a remote job as a Ruby on Rails developer. I have worked with companies from Europe and the United States.

I have nine years of experience as a Ruby on Rails developer. Among the latest jobs, I can mention Clevergig https://www.beeple.eu/en/clevergig I started working at Clevergig as a developer and ended up as a tech lead. I worked there for more than 3 years. I was involved in developing new functionality, maintaining old code, refactoring, and so on. I had great success in optimizing the application's performance. Together with the team, we have developed a lot of new complex functionality, which allowed the company to gain a good foothold in its niche: - I optimized some API endpoints. The response time decreased from 90-120 seconds to 0.5-2 seconds. - I implemented integration with external services such as SDB, AFAS, etc. - Together with DevOps, I set up a separate environment for one large client. The environment had its own separate Ruby On Rails app, separate MySQL database, separate Redis, etc.

Before that, I was involved in the development of a Ruby on Rails project with a peak load of 80,000 requests per minute.

CV: https://drive.google.com/file/d/1tW4JRoP3VuEs976mqeOta1u6V-P...

Linkedin: https://www.linkedin.com/in/oleksii-neishchenko-44a23893/

Email: oleksii@ilikegoodcode.com