> Markdown version of [/jobs/ext/3133268-senior-product-engineer-factorial-it-factorial-hr](https://www.wearedevelopers.com/jobs/ext/3133268-senior-product-engineer-factorial-it-factorial-hr). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md).

---

# Senior Product Engineer - Factorial It - Factorial Hr

- **Company:** Factorial Hr
- **Location:** Barcelona, Spain
- **Contract:** Permanent contract
- **Skills:** Artificial Intelligence, Cloud Computing, Code Review, IT Management, Ruby on Rails, Software Engineering, TypeScript, ReactJS, Large Language Models, Backend, Front End Software Development
- **Published:** September 29, 2026
- **Apply:** https://www.buscojobs.com.es/senior-product-engineer-factorial-it-factorial-hr-en-barcelona-ID-373335998

## About the Role

Compensaciones / Beneficios Alan private health insurance Wellhub gym/pools/outdoor classes Cobee expense savings Language classes Breakfast in office and organic fruit Food discounts with Nora Responsabilidades 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 Requisitos principales 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 Entrepreneurial mindset Strong collaboration and teamwork Ability to learn quickly and teach others Ruby on Rails React or TypeScript AI model integration

## Description

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 Alan private health insurance Wellhub gym/pools/outdoor classes Cobee expense savings Language classes Breakfast in office and organic fruit Food discounts with Nora Responsabilidades 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 Requisitos principales 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 Entrepreneurial mindset Strong collaboration and teamwork Ability to learn quickly and teach others Ruby on Rails React or TypeScript AI model integration


## Related Videos

- [Do TypeScript without TypeScript](https://www.wearedevelopers.com/videos/327-do-typescript-without-typescript)
- [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)
- [Agentic employees in world's most downloaded FinTech app](https://www.wearedevelopers.com/videos/100123-agentic-employees-in-world-s-most-downloaded-fintech-app)
- [Meet Your New BFF: Backend to Frontend without the Duct Tape](https://www.wearedevelopers.com/videos/682-meet-your-new-bff-backend-to-frontend-without-the-duct-tape)
- [The Art and Craft of Type Development](https://www.wearedevelopers.com/videos/81-the-art-and-craft-of-type-development)

## 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)
- [Navigating the AI Shift](https://www.wearedevelopers.com/magazine/629-navigating-the-ai-shift)
- [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs)
- [Dev Digest 137 - AI'm not sure about this](https://www.wearedevelopers.com/magazine/485-dev-digest-137-ai-m-not-sure-about-this)