Senior Ruby on Rails Engineer (LLM)

Stack

Responsibilities

• ▹Own features from technical design to production
• ▹Build and maintain Ruby on Rails systems used at scale
• ▹Design AI/LLM-assisted features and workflows that improve product quality or user experience
• ▹Work with LLM APIs, prompts, and retrieval/context strategies
• ▹Make trade-offs around performance, reliability, cost, latency, security, and maintainability
• ▹Write and maintain automated tests, including unit, integration, and E2E tests
• ▹Debug production issues and improve system reliability

Requirements

• ▹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
• ▹Strong testing habits and care for long-term code quality

Nice to have

• ▹Experience with React
• ▹Experience with CI/CD, background jobs, or AWS
• ▹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

Soft skills

What we offer

• ▹Stable, self-funded, and profitable company, founded in 2007
• ▹Work on WPML, the #1 multilingual plugin for WordPress, used on 1.5M+ sites
• ▹Fully remote, async-friendly work within EMEA hours
• ▹Engineering-driven culture with ownership and autonomy
• ▹Fair compensation and benefits

About the company

OnTheGoSystems is a stable, self-funded, and profitable company founded in 2007, and the creator of WPML, the leading multilingual plugin for WordPress used on over 1.5 million sites.