# Senior Ruby on Rails Developer

> OnTheGoSystems · Romania (Remote) · Full-time · Posted 2026-05-25

**Workplace:** remote

## Description

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

## Requirements

### What we’re looking for:

To succeed in this role, you’ll have:

-   Strong professional experience with Ruby on Rails, ideally at senior level
-   Experience building and running production systems used by real customers
-   Strong backend skills, including databases, API design, performance, background jobs, and security;
-   Ability to break down ambiguous problems and propose practical technical solutions
-   Hands-on interest or experience with AI/LLM technologies, 
-   Good judgment about when to use AI and when simpler engineering approaches are better
-   Strong testing habits and care for long-term code quality
-   A responsible, curious, flexible mindset: willing to debug, deploy, investigate, learn, and own outcomes

**Nice to have:** 

-   Experience with React
-   CI/CD, background jobs, or AWS experience
-   Experience building AI-powered product features in production
-   Familiarity with embeddings, vector search, RAG, evals, or LLM observability
-   Experience with text-processing, localization, translation, or multilingual products

## Benefits

### Why Join [OTGS](https://onthegosystems.com/)?

-   Stable & self-funded: Founded in 2007, profitable, and independent.
-   Industry leaders: Creators of [WPML](https://wpml.org/), the #1 multilingual plugin for WordPress, used on 1.5M+ sites
-   Fully remote, async-friendly: Work from anywhere within EMEA hours
-   Engineering-driven culture: Ownership, autonomy, testing, and thoughtful problem-solving

-   Fair compensation and great benefits: Designed to support your well-being both inside and outside of work.

## Apply

[Apply at OnTheGoSystems](https://apply.workable.com/on-the-go-systems/j/4FEE421D7F/apply)

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