Senior Ruby on Rails Developer

Senior Ruby on Rails Developer

We are looking for a senior Ruby on Rails developer to help us build reliable, scalable products and apply AI/LLM technologies where they create real value.

This is a hands-on engineering role for someone who can own complex features end to end, make strong technical decisions, and work across backend architecture, production systems, testing, and AI-assisted product development.

You should be excited about AI, but pragmatic enough to know when a simple, deterministic solution is better than an LLM call.

What you’ll be working on:

Owning features from technical design to production

Building and maintaining Ruby on Rails systems used at scale

Designing AI/LLM-assisted features and workflows where they improve product quality or user experience

Working with LLM APIs, prompts, retrieval/context strategies, and AI-assisted development tools

Making trade-offs around performance, reliability, cost, latency, security, and maintainability

Writing and maintaining automated tests, including unit, integration, and E2E tests

Debugging production issues and improving system reliability

Requirements

What we’re looking for:

To succeed in this role, you’ll have:

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,

Good judgment about when to use AI and when simpler engineering approaches are better

Strong testing habits and care for long-term code quality

A responsible, curious, flexible mindset: willing to debug, deploy, investigate, learn, and own outcomes

Nice to have:

Experience with React

CI/CD, background jobs, or AWS experience

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

Benefits

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.