Software Engineer - Mobile

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:

• Treat AI as central to their craft
• Are obsessed with building and shipping fast
• Care about real impact, not hierarchy or titles

If that sounds like you, keep reading., We're looking for a Staff/Senior React Native Engineer to help us boost the company to the next level.

Ready to be part of the challenge?

• Team player: You are comfortable helping your teammates, sharing your knowledge, reviewing their code and asking for reviews of your own. Not afraid of technical challenges, in fact, you are hungry for the impossible
• Engineer: We're not looking for coders, we are looking for engineers, customer-centric people that understand what customer needs, and is able to propose different approaches to deal with an opportunity.
• Someone who like relaxed and fun environments: We work hard and we are committed to Factorial users but we do that in a fun and relaxed atmosphere. We don't take ourselves too much seriously.
• Learner: you want to improve your skills not only in the engineering field but across any other areas.
• Owner: You like proposing new hypotheses and be responsible for building, deploying and validating them.
• Someone who love understanding: Breaking down complex problems into basic and shareable elements and you have evolved concrete implementations to abstractions before., * You will be part of the mobile engineering team, working closely with other talented mates. The objective of the team is provide a super smooth experience for app users.
• You will ideate, craft and deploy interactions and experiences for customers. Being creative with opportunities, being smart crafting them and being realized by observing the results. And enjoying iterating them.
• You will be actively participating in the definition of the objectives for the team having the customer on mind.
• You will be part of the continuous improvement of our technology, infrastructure and architecture of the app.
• You will be owner and accountable of the success of the team.

In this process you will be guided and helped by a buddy since first day, and a super talented team to play together.

What we're looking for

Your title matters less than your mindset.

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

• 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

How We Work

• Office-first in Barcelona & Madrid, 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

• Tech vision: We are looking for people with experience in React Native and a deep understanding of its under the hood mechanics. Someone that could move the needle in terms of tech, someone who can challenge our architecture and our processes to make a top-level application.
• Mentor: You love to share your experience and expertise to help others grow.
• Someone who have some years of experience working as a software engineer.
• Someone who is comfortable with communicating in English.

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

• High growth, multicultural and friendly environment
• Alan as private health insurance
• Healthy life with Wellhub (Gyms, pools, outdoor classes)
• Save expenses with Cobee
• Language classes
• Breakfast in the office and organic fruit
• Nora discounts
• Free caffeine and theine
• Pet Friendly

The hiring process

If you apply, here's what to expect: * A first conversation with our Talent Acquisition Partner. It will be about comparing our expectations and making sure we match on a human level. We will also check our Engineering Rubrics (check them out, they are open!) and the salary in your position.

• A second conversation with the team's Engineering Manager. This is about making sure we can work together. Here you will have a conversation about the team, their needs, your profile and how can you complement it. Expect to have a mix of a human and technical conversation.
• A Live Engineering Challenge with two Factorial engineers: At Factorial, we're passionate about hiring engineers who can think clearly, communicate well, leverage the best tools, and learn very fast. In this challenge, we're not looking for a finished product, but for how you structure problems, ask questions, use technology, and reason about solutions.
• One last coffee-chat with our CTO, where you can get all the answers about Factorial's culture, business vision, or anything else that interests you.
• And that's it! Feel free to request any other conversation you want, with team members or to address specific concerns at any time during the process.

The whole process is remote, using videoconferencing tools!

Factorial