AI Engineer - Ruby on Rails

OnTheGoSystems; United Kingdom; Remote; GBP 90,000 - 130,000; Full time

Benefits offered by this job

Fully remote

Async-friendly work culture

EMEA-friendly hours

Job summary

OnTheGoSystems Ltd. is seeking an AI Engineer with practical AI/LLM experience to build production features in Ruby on Rails. You will work on AI-powered product features, integrate LLM APIs, and ensure robust, tested, maintainable software.

The role emphasizes strong backend skills, API design, performance, and security, with a focus on AI-driven workflows and multilingual products. This is a fully remote opportunity within the EMEA region.

Qualifications

• Practical experience building with AI/LLM technologies, not just using AI tools casually.
• Strong Ruby on Rails experience, ideally at a senior level.
• 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, AWS experience.
• Experience with text-processing, localization, translation, or multilingual products.

Responsibilities

• 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

Skills

AI/LLM integration

Ruby on Rails

Backend development

API design

Performance optimization

Security

CI/CD

AWS

Localization

Multilingual products

Tools

Rails framework

Job description

AI Engineer - Ruby on Rails

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:

• 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.