Senior AI/LLM Engineer - Ruby on Rails

OnTheGoSystems Romania
Remote
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AI Summary

We are seeking a senior engineer with practical AI/LLM experience to build production features in Ruby on Rails. The ideal candidate will have strong Ruby on Rails experience and the ability to integrate LLM APIs into Ruby on Rails systems. The role involves designing and building AI/LLM-assisted product features, improving reliability and security, and writing automated tests.

Key Highlights
AI/LLM experience
Ruby on Rails
LLM API integration
Production feature development
Key Responsibilities
Designing and building AI/LLM-assisted product features
Integrating LLM APIs into Ruby on Rails systems
Improving reliability, accuracy, consistency, latency, cost, security, and maintainability
Writing and maintaining automated tests
Technical Skills Required
Ruby on Rails AI LLM APIs Databases API design Security
Benefits & Perks
Stable and self-funded company
Fully remote work
Fair compensation and great benefits
Nice to Have
CI/CD experience
Background jobs experience
AWS experience
Text-processing, localization, translation, or multilingual products experience

Job 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

Want to make a lasting impact on a product used by thousands of real customers? We would love to hear from you.

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