# AI Engineer - Ruby on Rails

> OnTheGoSystems · Barcelona, Spain (Remote) · Full-time · Posted 2026-05-29

**Workplace:** remote

## Description

We are looking for an engineer with practical AI/LLM experience who can build production features in Ruby on Rails.

This role is for someone who has worked with AI tools, LLM APIs, prompts, retrieval/context patterns, or AI-assisted workflows - and who also has the engineering depth to turn those ideas into reliable, tested, maintainable software.

### What you’ll be working on:

-   Designing and building AI/LLM-assisted product features
-   Integrating LLM APIs into Ruby on Rails systems
-   Combining AI approaches with business logic, tests, fallbacks, and production safeguards
-   Owning features from technical design to production
-   Improving reliability, accuracy, consistency, latency, cost, security, and maintainability
-   Writing and maintaining automated tests, including unit, integration, and E2E tests
-   Debugging production issues and improving system behavior over time

## Requirements

### What we’re looking for:

To succeed in this role, you’ll have:

-   Practical experience building with AI/LLM technologies, not just using AI tools casually
-   Strong Ruby on Rails experience, ideally at a senior level
-   Good judgment about when AI is useful and when simpler engineering is better
-   Strong backend skills, including databases, API design, performance, background jobs, and security
-   Ability to break down ambiguous problems into clear technical solutions

**Nice to have:**

-   CI/CD, background jobs, or AWS experience
-   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/C61CCADD62/apply)

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