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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Product Engineer - Factorial It - **Company:** Factorial Hr - **Location:** Barcelona, Spain - **Contract:** Permanent contract - **Skills:** Artificial Intelligence, Cloud Computing, Code Review, IT Management, Ruby on Rails, Software Engineering, ReactJS, Large Language Models, Backend, Front End Software Development - **Published:** September 14, 2026 - **Apply:** https://www.buscojobs.com.es/senior-product-engineer-factorial-it-en-barcelona-ID-371029698 ## About the Role Compensaciones / Beneficios * Own major initiatives and define quarterly roadmaps for the domain * Engage in customer conversations to understand pains and needs * Review code daily and provide feedback across the team * Learn from and mentor teammates, fostering engineering quality * Collaborate to integrate AI models into scalable, cloud-native environments * Bridge non-deterministic outputs to actionable team decisions * Explain complex technical decisions clearly to non-technical stakeholders * Contribute to building agentic workflows and LLM-enabled features Responsabilidades * 4+ years in software engineering * Experience shipping AI-powered features * Strong Ruby on Rails backend and React frontend skills * Ability to reason about LLM architecture tradeoffs and probabilistic systems * Comfort reviewing and discussing code with colleagues of varying levels * Ability to explain complex technical decisions in clear English * Experience integrating AI models into scalable environments * Entrepreneurial mindset with comfort working from scratch in an early-stage setup Requisitos principales * Alan private health insurance * Wellhub gym/pools/outdoor classes * Cobee expense savings * Language classes * Breakfast in office and organic fruit * Food discounts with Nora ## Description Experteer Overview In this Founding Engineer role, you will help launch a new Factorial spinoff focused on AI-first IT management workflows, onboarding, permissions, and equipment management.You'll own high-impact initiatives from day zero, shaping architecture and delivering usable AI-powered features.You'll work closely with cross-functional teams to move fast, learn from real customers, and build a product that scales with a growing user base.This is a hands-on, end-to-end engineering role in a small, ambitious startup inside Factorial.Compensaciones / Beneficios * Own major initiatives and define quarterly roadmaps for the domain * Engage in customer conversations to understand pains and needs * Review code daily and provide feedback across the team * Learn from and mentor teammates, fostering engineering quality * Collaborate to integrate AI models into scalable, cloud-native environments * Bridge non-deterministic outputs to actionable team decisions * Explain complex technical decisions clearly to non-technical stakeholders * Contribute to building agentic workflows and LLM-enabled features Responsabilidades * 4+ years in software engineering * Experience shipping AI-powered features * Strong Ruby on Rails backend and React frontend skills * Ability to reason about LLM architecture tradeoffs and probabilistic systems * Comfort reviewing and discussing code with colleagues of varying levels * Ability to explain complex technical decisions in clear English * Experience integrating AI models into scalable environments * Entrepreneurial mindset with comfort working from scratch in an early-stage setup Requisitos principales * Alan private health insurance * Wellhub gym/pools/outdoor classes * Cobee expense savings * Language classes * Breakfast in office and organic fruit * Food discounts with Nora ## Related Videos - [Agentic employees in world's most downloaded FinTech app](https://www.wearedevelopers.com/videos/100123-agentic-employees-in-world-s-most-downloaded-fintech-app) - [Are Code Reviews Worth It? Insights from 16 Years of Review Data](https://www.wearedevelopers.com/videos/1135-are-code-reviews-worth-it-insights-from-16-years-of-review-data) - [Developing the Backend with Stefan Lingler, CTO at Shpock](https://www.wearedevelopers.com/videos/100360-developing-the-backend-with-stefan-lingler-cto-at-shpock) - [Watch Tests Go Brrrr! : Getting Started with Cypress in ReactJS](https://www.wearedevelopers.com/videos/282-watch-tests-go-brrrr-getting-started-with-cypress-in-reactjs) - [You are not an AI developer](https://www.wearedevelopers.com/videos/1148-you-are-not-an-ai-developer) - [Build a CI/CD pipeline to automate code reviews and ensure code quality](https://www.wearedevelopers.com/videos/349-build-a-ci-cd-pipeline-to-automate-code-reviews-and-ensure-code-quality) ## Related Articles - [Dev Digest 121 - AI goes offline](https://www.wearedevelopers.com/magazine/456-dev-digest-121-ai-goes-offline) - [Dev Digest 120 - Apple and peers](https://www.wearedevelopers.com/magazine/455-dev-digest-120-apple-and-peers) - [Dev Digest 132 - Binging WADFlix?](https://www.wearedevelopers.com/magazine/473-dev-digest-132-binging-wadflix) - [Dev Digest 137 - AI'm not sure about this](https://www.wearedevelopers.com/magazine/485-dev-digest-137-ai-m-not-sure-about-this) - [Highest Paying Tech Companies in Europe](https://www.wearedevelopers.com/magazine/162-highest-paying-tech-companies-in-europe) - [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs)