Senior Product Engineer - Factorial It

Factorial Hr
Barcelona, Spain
5 days ago
Apply on www.buscojobs.com.es
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Role details

Contract type
Permanent contract
Employment type
Full-time (> 32 hours)
Experience required
4 years minimum
Working hours
Regular working hours
Languages
English

Tech stack

Artificial Intelligence Cloud Computing Code Review IT Management Ruby on Rails Software Engineering ReactJS Large Language Models Backend Front End Software Development

Job 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

Requirements

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

Apply for this position

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Apply on www.buscojobs.com.es
Prepare application

Good distractions

Talks and stories from around this role — technically off-topic, practically not.

1:21 min

Exploring the target application for front end tests

Anna Mcdougall · JS Congress

1:52 min

Structuring and scaling the backend engineering team

Stefan Lingler Stefan Lingler +1 · Coffee With Developers

3:39 min

Addressing code review surrender and process exploitation

Laura Tacho Laura Tacho · World Congress 2026 Europe

2:14 min

Exploring internal AI product initiatives and global engineering roles

Maria Apazoglou · Coffee With Developers

2:59 min

Introduction and transitioning into the tech industry

Anna Mcdougall · JS Congress

2:37 min

Optimizing technical profiles for AI sourcing and recruitment

Mina Golesorkhi Mina Golesorkhi · World Congress 2026 Europe

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