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AI Engineer - Ruby on Rails

OnTheGoSystems · Zagreb, Grad Zagreb, Croatia

8 h ago
Remote Senior (5-10 yrs) Full-time Croatia
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About the role

Design and build production-ready AI/LLM-assisted product features integrated into Ruby on Rails systems. Own the full feature lifecycle from technical design to production, ensuring reliability, security, and maintainability through automated testing.

What they look for

Ruby on Rails AI/LLM Integration Prompt Engineering API Design Backend Engineering Database Management Automated Testing CI/CD AWS Technical Design Performance Optimization Security

Requirements

Requires senior-level Ruby on Rails experience and practical expertise in building with AI/LLM technologies. Candidates must possess strong backend skills and the ability to translate ambiguous problems into clear technical solutions.

Benefits

Fair Compensation Well-being Support

Full 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

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

Why Join OTGS?• Stable & self-funded: Founded in 2007, profitable, and independent.

  • Industry leaders: Creators of WPML, 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.