Senior Ruby on Rails Developer
Role summary by JobGrid
Senior Ruby on Rails Developer at OnTheGoSystems: Remote, Poland; Full time; Senior; IT; Back End Engineer. JobGrid adds normalized role facts, source context, and a path to the employer application page so candidates can compare the listing before applying.
- Location and workplace: Remote, Poland
- Role classification: IT, Back End Engineer, Full time, Senior
- Source freshness: checked by JobGrid on 2026-05-28.
- Application path: candidates continue to the employer application page with non-personal referral tags.
We are looking for a senior Ruby on Rails developer to help us build reliable, scalable products and apply AI/LLM technologies where they create real value.
This is a hands-on engineering role for someone who can own complex features end to end, make strong technical decisions, and work across backend architecture, production systems, testing, and AI-assisted product development.
You should be excited about AI, but pragmatic enough to know when a simple, deterministic solution is better than an LLM call.
What you’ll be working on:
- Owning features from technical design to production
- Building and maintaining Ruby on Rails systems used at scale
- Designing AI/LLM-assisted features and workflows where they improve product quality or user experience
- Working with LLM APIs, prompts, retrieval/context strategies, and AI-assisted development tools
- Making trade-offs around performance, reliability, cost, latency, security, and maintainability
- Writing and maintaining automated tests, including unit, integration, and E2E tests
- Debugging production issues and improving system reliability