Factorial

Talent Domain 👾

Our mission is to help companies develop their employees, keeping them engaged and delighted at the same time, helping the company’s teams become the best versions of themselves.

To do this, we provide tools to managers and HR managers in the areas of recruitment, performance, engagement, and trainings. But we know there is space for more! That's why we need talented people to go faster.

The role 📜

As a Senior Engineer at Factorial, you'll be part of a team of 150+ product developers. We look for talented people who are curious, proactive, and have great communication skills. People who are at the forefront of developing tools that help teams become the best versions of themselves.

You'll work in a multicultural, English-speaking environment where your technical acumen, creative problem-solving abilities, and passion for user-centric products will directly contribute to our mission of improving HR processes for SMEs worldwide. It’s your choice to work from home, in our Barcelona offices, or mixing both.

Our stack is Ruby on Rails for the backend and React/React Native for the clients.

But, hey! Don't let unfamiliarity with these specific technologies hold you back! If you're someone eager to learn, you have navigated through diverse technical challenges throughout your career, and have a hunger for building new solutions that help cultivate highly satisfied, productive, employees, then we want to talk to you.

Work ethics

At Factorial, we know that building a great product means building a great team. We value some key principles that help us thrive together.

1. Radical (and Passionate) Candor: We're excited about creating great products and advancing our mission. This means being proactive, obsessing about quality, and experimenting. We tell our managers and peers things we think we cannot say, practicing radical candor to drive innovation and improvement.
2. Effective Communication: Clear communication, especially in writing, is crucial. We communicate openly, build narratives, and aren't afraid to debate ideas. If we can't explain something clearly, we seek to understand more deeply until we can. And remember, English is our vehicular language, so you need to be comfortable with it!
3. Product Vision: We understand our users' needs and actively engage with them. We constantly look for business opportunities, always asking "What can be next for Factorial?"
4. Reliability and Accountability: We deliver on our commitments while maintaining high quality. We feel accountable for the culture and make others feel accountable too. When we see something broken, we stand up to fix it, feeling responsible for all of Factorial.
5. Problem-Solving: We don't limit ourselves to our nominal job definition. We bring, execute, and later communicate solutions, seeking approval only for decisions that would be hard to reverse.
6. Teamwork Ease: We collaborate well, adapt easily, and are open to feedback. We convince or get convinced, asking the same from everyone. If an initiative comes top-down, we debate it until we fully buy-in, then champion it to our teams.
7. Fighting Complacency: We challenge the status quo and fight complacency with our whole hearts. We're vocal when something is going wrong, seeing it as an opportunity for a better world.
8. Having Fun: While our work is serious, we trust our gut when we have a 10x motivation to try something new. We jump on opportunities for innovation, involving as many people as possible.

Your first steps in Factorial

You’ll start with a 2 weeks onboarding period, where you will:

1. Read a lot: Learn about Factorial, our product, our team, and our clients.
2. Learn a lot: Pair with each team member at least once, to understand what they are working on.
3. Code a lot: Solve low-stake bug tickets or quick wins.
4. Fail a lot: We work with ephemeral development environments with almost zero configuration so you can start coding fast. And failing, going back, retrying… We understand this is part of the path, so, we will encourage you to be brave!
5. Talk a lot: Be fully integrated into the team’s rituals from day one.

After your onboarding, your day-by-day work will look like the following:

1. You will be a product engineer, taking ownership of big initiatives, and being interested in the outcome, not just the output. About the outcome, you’ll also work with your team members to establish goals and plan a quarterly roadmap, putting special attention to the technical needs of our domain.
2. A Senior Engineer at Factorial influences requirements definition and is autonomous in delivering a polished solution that matches those. You participate in the team’s decision through Requests For Comments (RFCs) that you write yourself or read others’.
3. You will be involved in customer calls to learn about their pains & needs.
4. You will review code daily and get feedback on your code at every pull request, from all team members, including juniors.
5. You will learn from the entire team, both on technical topics (performance, architecture…) and core skills, in an environment driven by engineering quality. You will also mentor junior team members and help them learn from your experience.

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?

We’re looking for engineers who:

1. 🧠 Treat AI as central to their craft
2. ⚡ Are obsessed with building and shipping fast
3. 🎯 Care about real impact, not hierarchy or titles

If that sounds like you, keep reading.

The Team 🧩

The Operations domain sits at the core of Factorial. This is where we build the systems that run the day-to-day reality of work for thousands of companies, systems that must be accurate, compliant and reliable.

Our teams own business-critical workflows such as:

1. How employee time is tracked, planned, and managed
2. How the employee journey is modeled from onboarding to offboarding
3. How companies represent their organizational structure
4. How compensation and payroll data are calculated and trusted

Our mission is to turn operational complexity into simple, AI-powered experiences, helping companies run smoothly at scale while keeping humans in control of what matters most.

What You’ll Do 🚀

As a Product AI Engineer at Factorial, you’ll help define and build the next generation of our AI-native product using modern AI development practices.

You will:

1. Build product using Spec Driven Development
2. We define clear specifications before shipping — including expected behaviours, constraints, and success criteria — and use them to guide implementation, iteration and evaluation using most powerful LLMs.
3. Design and implement AI Skills
4. Create reusable, well-scoped AI capabilities that can automate and take actions safely within Factorial’s workflows.
5. Develop and maintain evaluation frameworks (Evals)
6. Measure quality, correctness and reliability of AI outputs using automated and human-in-the-loop evaluations to ensure continuous improvement in production.
7. Apply Retrieval-Augmented Generation (RAG)
8. Build systems that ground AI responses in trusted, up-to-date company data, balancing probabilistic models with deterministic sources of truth.
9. Design human-in-the-loop and agentic workflows
10. Combine LLMs, rules, and user oversight to automate real business processes while keeping humans in control of critical decisions.
11. Own systems end-to-end
12. From problem definition and system design to shipping, monitoring and iteration in production.
13. Stay close to our customers
14. 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, not assumptions.
15. Collaborate closely with Product and Design
16. Shape how AI is embedded into core user experiences — not as a feature, but as part of the workflow.
17. Share knowledge and raise the bar
18. Mentor peers, document learnings, and contribute to Factorial’s AI engineering best practices.

Who This Is For 🧠

Your title matters less than your mindset.

You might be mid, senior, or staff, what we care about is:

1. AI as a habit: you’ve built real AI-powered systems or workflows (not just experiments)
2. Proven impact: shipped projects, side projects, or contributions that made a measurable difference
3. Product-first thinking: you design complete experiences, not just isolated components
4. 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) 🧱

Strong candidates often have:

1. Solid software engineering fundamentals (any language — Python is common)
2. Experience shipping real products to production
3. Knowledge of APIs, cloud platforms, and system design
4. 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 🏢

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

At Factorial, we're looking for a hands-on Engineering Manager to help us tackle our domain's challenges and ensure our product development reaches the next level. We want someone who enjoys making a real impact by working closely with the business.

As an Engineering Manager, you will be responsible for leading the development of your team while also being accountable for the health and growth of your product. 🚀

The Engineering team at large 🙌🏼

At Factorial, we have a team of over 200 Software Engineers. We look for curious, proactive people with good soft and communication skills. The last one is the key in a distributed company.

We don’t focus on a long list of skills and technologies. While our stack is Ruby on Rails for the backend and React/React Native for the clients, proficiency in these is not mandatory. We believe that good aptitudes and a hunger for learning work best!

About you 🫵🏻

1. You have managed people before and have experience guiding engineers to successful careers (ideally even above you!).
2. You have actively participated in hiring processes, bringing top talent to the organization.
3. You are comfortable cooperating with other teams and building the fundamentals of service.
4. When you disagree with a peer, you engage in a Socratic exchange, prioritizing finding a solution over winning arguments. You convince or get convinced.
5. You have 5+ years of experience working as a full-stack developer or in a similar position.
6. You have 2+ years of experience leading teams.
7. You have a deep understanding of APIs (REST, GraphQL, and similar) and can create integrations with other backend systems.
8. You believe that consistency, performance, quality, and scalability are more than buzzwords and have a deep real meaning that needs to translate into products and services.

Hi! 👋

At Factorial, we're on the lookout for a Senior Product Manager who can drive product strategy and execution in a landscape where AI isn't a feature—it's how products get built, shipped, and improved. We're not bolting AI onto existing products; we're rebuilding with the assumption that AI is already here.

The Role ✨

You'll own a key product area at Factorial with full autonomy over strategy and execution. You'll move fast while keeping the long-term vision in sight. You should be a self-starter who thrives in ambiguity and knows how to identify high-value problems before anyone else does.

Here's the thing: most PMs manage features. You'll manage outcomes—including how AI amplifies user value. You'll work with an exceptional team of designers and engineers, and you'll help shape what modern HR software looks like.

What You'll Be Doing

As a Senior Product Manager at Factorial, you will:

1. Own the product area: Define the product vision, roadmap, and key initiatives. Figure out where AI genuinely solves user problems—and where it shouldn't be forced.
2. Lead AI-informed execution: Work closely with Engineering, Design, Data, and AI teams to bring your vision to life. Use AI tools to accelerate product decisions, user research, and iteration cycles.
3. Evaluate AI impact rigorously: Build evaluation frameworks to measure when AI features actually work. Understand model limitations, hallucination risks, and what success looks like for AI-powered workflows. You're not shipping blind.
4. Manage integrations strategically: Oversee third-party integrations and partner ecosystems. Balance build-vs-integrate decisions with a clear view of how integrations amplify your product's capabilities. This isn't afterthought stuff—it's core strategy.
5. Collaborate cross-functionally: Partner with customers, Customer Success, Marketing, and Sales to deeply understand user needs and the HR space. Identify opportunities to create real value.
6. Drive impact: Own business outcomes, product success metrics, and continuous improvement. You're accountable for results.

What We're Looking For

You're likely a great fit if you:

1. Have proven experience in B2B SaaS Product Management (preferably 5+ years with at least 3 years of hands-on full-lifecycle ownership). You've shipped products, you understand Go-to-Market, and you know how to move through ambiguity.
2. Are business-driven and obsessed with creating impact. You align product strategy with business goals and user needs. You think like an entrepreneur—you can spot hidden opportunities in compliance, pricing, or workflows, and turn them into scalable value for customers and Factorial.
3. Are deeply data-driven, setting hypotheses and success metrics before each launch. You value measurable results and dig for insights when answers aren't obvious. You're resourceful with data and now, increasingly, with AI-powered analytics.
4. Understand AI's role in product strategy (this is new, and it matters). You don't need to code or do ML, but you understand LLM capabilities and limitations. You can evaluate AI features rigorously, spot risks like hallucination or bias, and know when AI genuinely improves UX versus when it's unnecessary.
5. Have a keen eye for design and user experience. You appreciate intuitive interfaces and love solving complex problems with simple, elegant solutions.
6. Possess strong communication skills: You're confident pitching, influencing, and advocating for your product vision internally and externally. You interface comfortably with senior leadership and customers.
7. Thrive in ambiguity: You're proactive, identify high-value problems, and develop actionable plans even when the path forward isn't clear.
8. Have experience working with third-party integrations and platforms. You have strong technical intuition: comfortable discussing system design, understanding database flows, and evaluating trade-offs in performance, code quality, and integrations. You don't need to code, but you speak the language of engineers.
9. Are comfortable with scaling processes and managing multiple stakeholders, proactively optimizing workflows—even beyond your immediate area of responsibility.
10. Speak fluent English (additional languages such as Spanish, French, Italian, or German are highly valued).

Bonus Points if You:

1. Have worked with HR tech or similar domains.
2. Have experience in hyper-growth environments where things move fast and change is constant.
3. Have hands-on experience evaluating or shipping AI-powered features.
4. Have familiarity with integration architectures, API design, or marketplace dynamics.
5. Have a solid technical understanding of how to bridge engineering and business.

Compensation 💰

The salary range for this position is between €75,000 (€60,000 fix + €15,000 based on performance, paid quarterly) and €87,500 (€70,000 fix + €17,500 based on performance, paid quarterly). We focus on skills and impact, not years on the clock.

How We Work 💻

At Factorial, we believe the best products are built when people come together—in person—to collaborate, challenge ideas, and move fast. That's why our Product team follows an office-first, flexible approach.

We work on-site several days a week (80%), using that time to connect, align, and innovate as a team. However, we also understand the importance of focus and flexibility, so we support remote work when it makes sense (20%)—whether for deep work, personal needs, or just a change of scenery.

This balance helps us stay agile, creative, and closely connected—while giving everyone the space to do their best work.

Perks of being part of our team 💆

We care about people and we also offer a lot of benefits for employees:

1. High growth, multicultural and friendly environment 🤝🏽
2. Continuous training and learning based on your needs 🤓
3. Alan private health insurance 🩺
4. Healthy life with Wellhub (Gyms, pools, outdoor classes) 🧘🏽‍♀️
5. Save expenses with Cobee 💰
6. Language classes with Preply 👩🏽‍🏫
7. Get the most out of your salary with Payflow

And when at the office...

1. Breakfast in the office and organic fruit 🍏
2. Company canteen and Nora discounts 🍱
3. Pet Friendly 🐶

Join Factorial, where people grow 💗

Diversity is part of our culture, we have more than 43 nationalities in our teams and we are infused in an inclusive environment for all employees and candidates. Please feel free to apply with the way it suits you better! (blind resume, identity pronouns, cover letter, etc). We do not discriminate on any aspect, in fact; Factorial encourages everyone to join us!

About us 🚀

Factorial is an innovative Business Management Software solution designed to streamline company processes for small and medium-sized enterprises. Founded in 2016, our mission is to help companies automate workflows, centralize people data, and make better business decisions. With customers across over 60 countries worldwide, we've built a diverse team that's driving change in the business management tech space. Join us as we continue our rapid growth journey! 🌎

Our Values 🫀

1. We own it: We take responsibility for every project. We make decisions, not excuses.
2. We learn and teach: We're dedicated to learning something new every day and, above all, sharing it.
3. We partner: Every decision is a team decision. We trust each other.
4. We grow fast: We act fast. We believe that the worst mistake is not learning from them