Ai engineer - api & integrations team (oleiros)

Do you want to help us redefine how AI powers the future of Business Management software, not as an add‑on but as a core part of how people work, decide and grow?

The Team

The API & Integrations team addresses challenges at Factorial. We sit at the intersection between product and platform, owning the product surface while designing developer experiences for internal and external developers of integrations.

- Build tools for Factorial product teams to publish in our extensive public API.
- Build an integrations framework to provide the best user and developer experience when using integrations. Several Factorial products already use this framework, and we keep expanding it.
- Enable our developer partners to extend Factorial and live the best developer experience. With the acquisition of YepCode, we will boost how we build integrations, placing AI at the center of the process.

Our mission is to unblock markets that rely on fragmented external software and lower the barrier so that anyone—even HR managers—can create new integrations.

What You’ll Do

As a Product AI Engineer you will help define and build the next generation of our AI‑native product using modern AI development practices.

- Build product using Spec‑Driven Development. We define clear specifications before shipping— including expected behaviours, constraints, and success criteria— and use them to guide implementation, iteration and evaluation with the most powerful LLMs.
- Design and implement AI Skills. Create reusable, well‑scoped AI capabilities that can automate and take actions safely within Factorial’s workflows and when building integrations.
- Develop and maintain evaluation frameworks (Evals). Measure quality, correctness and reliability of AI outputs using automated and human‑in‑the‑loop evaluations to ensure continuous improvement in production.
- Apply Retrieval‑Augmented Generation (RAG). Build systems that ground AI responses in trusted, up‑to‑date company data, balancing probabilistic models with deterministic sources of truth.
- Design human‑in‑the‑loop and agentic workflows. Combine LLMs, rules and user oversight to automate real business processes while keeping humans in control of critical decisions.
- Own systems end‑to‑end. From problem definition and system design to shipping, monitoring and iteration in production.
- Stay close to our customers. We have a strong customer‑centric mindset; engineers regularly join customer calls, reviews and feedback sessions to deeply understand real workflows, pain points and constraints, ensuring we build the right solutions to real problems.
- Collaborate closely with Product and Design. Shape how AI is embedded into core user experiences—not as a feature but as part of the workflow.
- Share knowledge and raise the bar. Mentor peers, document learnings and contribute to Factorial’s AI engineering best practices.

Who This Is For

Your title matters less than your mindset.

- AI as a habit: you’ve built real AI‑powered systems or workflows (not just experiments).
- Proven impact: shipped projects, side projects or contributions that made a measurable difference.
- Product‑first thinking: you design complete experiences, not just isolated components.
- Speed & adaptability: you experiment, learn and iterate fast.

Bonus points if you’ve worked with LLMs, skill‑based agents, MCP or other AI protocols.

Technical Foundation (Not Strict Requirements)

- Solid software engineering fundamentals (any language—backend, frontend, ML).
- Experience shipping real products to production.
- Knowledge of APIs, cloud platforms and system design.
- A fast learning curve with new tools and technologies.

We care far more about what you’ve built than the stack you used.

How We Work

- Office‑first in A Coruña, with 20% remote flexibility.
- A people‑first, high‑trust culture built on radical candor and ownership.
- A multicultural team (40+ nationalities) building the next generation of business management software.

About Us

At Factorial, we’re building the leading business management software for companies of all sizes. Our platform centralises key workflows across HR, finance and operations, freeing teams from manual processes so they can focus on what really matters: leading, growing and taking care of their people. With over 1,200 employees across 7 markets, we serve 700,000+ users and are one of Europe’s fastest‑growing SaaS companies, backed by top‑tier investors and proudly headquartered in Barcelona. We believe in bold goals, radical ownership and inclusive collaboration. If you’re excited to shape the future of business management technology, we’d love to meet you.

Our Values

- We own it: we take responsibility for every project. We make decisions, not excuses.
- We learn and teach: we’re dedicated to learning something new every day and, above all, sharing it.
- We partner: every decision is a team decision. We trust each other.
- We grow fast: we act fast and think that the worst mistake is learning from it.
- We believe in diverse talent: we welcome applicants from all backgrounds and strongly encourage people of diverse experiences and identities to apply.
- We believe in inclusion: we are committed to equal opportunities and actively promote workplace inclusion of people with disabilities. If you would like to learn more about our inclusive recruitment processes, you are welcome to indicate so optionally and we will share additional information with you.

Perks

- High‑growth, multicultural and friendly environment.
- Private health insurance.
- Healthy life with Wellhub (gyms, pools, outdoor classes).
- Expense savings with Cobee.
- Language classes.
- Breakfast in the office and organic fruit.
- Nora discounts.
- Free coffee and tea.
- Pet friendly.

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