AI-Driven Product Engineer — End-to-End Impact

Factorial; Barcelona; Hybrid; EUR 50,000 - 70,000; Full time

Job summary

Factorial is seeking a Product Engineer to help scale AI-powered business management software. You’ll contribute across the stack with Ruby on Rails and React, shipping features end-to-end and exploring AI-driven workflows.

You’ll join an engineering team that values curiosity, ownership, and impact, in a Barcelona or Madrid office setting with remote options. You’ll work on AI-native product development across Europe, growing your craft in a fast-paced, collaborative environment and helping

Qualifications

• 1–4 years of software engineering experience.
• Curious about AI and how it works, not just how to use it.
• Cares about whether what you built helped the user.
• Comfortable with Ruby on Rails and React.
• Strong communication and collaboration skills.

Responsibilities

• Ship features end-to-end from problem understanding to production validation.
• Work on AI-integrated systems and workflows.
• Evaluate AI features in production focusing on reliability and impact.
• Take real ownership of your work and continuously learn.

Skills

Ruby on Rails

React

AI curiosity

Cross-stack development

Education

BSc in Computer Science

Job description

Factorial is seeking a Product Engineer to help scale AI-powered business management software. You’ll contribute across the stack with Ruby on Rails and React, shipping features end-to-end and exploring AI-driven workflows.

You’ll join an engineering team that values curiosity, ownership, and impact, in a Barcelona or Madrid office setting with remote options. You’ll work on AI-native product development across Europe, growing your craft in a fast-paced, collaborative environment and helping