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# Senior Ruby On Rails Engineer

- **Company:** Onthegosystems
- **Location:** Málaga, Spain (Remote available)
- **Contract:** Permanent contract
- **Skills:** Artificial Intelligence, Amazon Web Services, Automation of Tests, Software Quality, Databases, Continuous Integration, Software Debugging, Software Architecture, Ruby on Rails, Search Technologies, WordPress, ReactJS, Large Language Models, Reliability of Systems, Backend, Api Design
- **Published:** August 14, 2026
- **Apply:** https://www.buscojobs.com.es/senior-ruby-on-rails-engineer-en-malaga-ID-367100068

## About the Role

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

## Description

Senior Ruby on Rails EngineerWe are looking for a Senior Ruby on Rails Engineer 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 productionBuilding and maintaining Ruby on Rails systems used at scaleDesigning AI/LLM-assisted features and workflows where they improve product quality or user experienceWorking with LLM APIs, prompts, retrieval/context strategies, and AI-assisted development toolsMaking trade-offs around performance, reliability, cost, latency, security, and maintainabilityWriting and maintaining automated tests, including unit, integration, and E2E testsDebugging production issues and improving system reliabilityWhat we're looking for:To succeed in this role, you'll have:Strong professional experience with Ruby on Rails , ideally at senior levelExperience building and running production systems used by real customersStrong backend skills , including databases, API design, performance, background jobs, and security;Ability to break down ambiguous problems and propose practical technical solutionsHands-on interest or experience with AI/LLM technologies,Good judgment about when to use AI and when simpler engineering approaches are betterStrong testing habits and care for long-term code qualityA responsible, curious, flexible mindset: willing to debug, deploy, investigate, learn, and own outcomesNice to have:Experience with ReactCI/CD, background jobs, or AWS experienceExperience building AI-powered product features in productionFamiliarity with embeddings, vector search, RAG, evals, or LLM observabilityExperience with text-processing, localization, translation, or multilingual productsWhy Join OTGS ?Stable & self-funded: Founded in ****, profitable, and independent.Industry leaders: Creators of WPML , the #1 multilingual plugin for WordPress, used on 1.5M+ sitesFully remote, async-friendly: Work from anywhere within EMEA hoursEngineering-driven culture: Ownership, autonomy, testing, and thoughtful problem-solvingFair 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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