Overview

We are building a new startup inside Factorial, aiming to scale from 0 to 10 million in under a year. The new spinoff focuses on rethinking how companies manage workflows, org charts, policies, and analytics—core operational facets of Factorial’s platform. As a Founding Engineer, you will join at day zero, working closely with a small, high‑energy team that values speed, decision‑making with incomplete data, and building products people actually use.

Key Responsibilities

Lead the design, development, and delivery of AI‑powered features for the IT Management domain, including onboarding, permissions, support, and equipment management.

Own the full lifecycle of features—from hypothesis, to build, to deployment, measurement, and iteration.

Conduct customer calls to understand pain points and translate them into product requirements.

Review and mentor code daily, providing constructive feedback to all team members, including juniors.

Collaborate with the product team to set quarterly goals and roadmap, focusing on technical readiness and alignment with business objectives.

Advise teammates on transitioning from deterministic to probabilistic AI models, ensuring outputs can be reasoned about and acted upon.

Ensure scalable, cloud‑native integration of AI models with a Ruby on Rails backend and a React/TypeScript frontend.

Get involved in architectural decisions concerning agentic workflows and LLM trade‑offs.

Participate in recruiting, interview, and mentoring processes to grow the engineering team.

Qualifications

4+ years of software engineering experience, preferably with a track record of shipping AI features.

Strong experience in Ruby on Rails and React or TypeScript.

Proficiency in building and maintaining scalable backend services, integrating AI models, and ensuring reliability.

Hands‑on understanding of LLM architecture,



agentic workflows, and probabilistic systems.

Ability to explain complex technical concepts in clear English to non‑technical stakeholders.

Entrepreneurial mindset, comfortable building from scratch, shipping quickly, and learning from data.

Collaborative attitude, eager to mentor others and engage in peer reviews.

Experience or strong curiosity about onboarding, permissions, or IT operations is a plus.

Working Model

Office‑first model in Barcelona or Madrid: on‑site several days a week for collaboration and alignment.

Remote work is supported when it benefits focus, personal needs, or change of scenery.

Versátil schedule balances deep work with team interaction.

Hiring Process

Intro Call – discussion with Talent Partner about your journey and goals.

Hiring Manager Interview – deep dive into product mindset, teamwork, and problem‑solving.

Live Challenge – collaborative technical exercise based on real‑life problems.

Final Coffee Chat – relaxed conversation with the CTO & VP of Engineering to explore vision, culture, and growth.

All stages are conducted remotely via video conferencing tools.

Benefits

Private health insurance through Alan.

Wellness program with Wellhub (gyms, pools, outdoor classes).

Subscription to language learning platforms.

Breakfast and organic fruit in the office.

Food discounts with Nora.

Pet‑friendly workplace.

Opportunities for growth in a fast‑moving, multicultural environment.

We welcome applicants from all backgrounds and advocate equal opportunities. We are committed to workplace inclusion of people with disabilities; please indicate any accommodation needs during the application process.

Company Commitment

Factorial is a leading AI‑powered business management platform with over 15,000 customers, 1,500 employees worldwide, and a focus on transparency, career progression, and inclusive culture.

📌 Senior Product Engineer - Factorial IT (Madrid)
🏢 Factorial Hr
📍 Madrid