Senior Software Engineer - Authentication Team

Hello! 👋

Would you love to improve the way companies take care of their people, their most valuable asset?

We are looking for a Senior Software Engineer to join our CIAM (Customer Identity and Access Management) team  will work on both sides of the stack but with more focus on the backend side.

Our Platform Domain:

You’ll be on the Customer Identity and Access Management (CIAM) team owning areas such as:
Authentication, Single Sign-On, Multi-Factor Authentication, Authorization, Permissions, Auditing.

Sitting within the Platform Domain, you will lay the foundations for external and internal users to extract and deliver value from our platform.

The role requires full ownership of your area, a self-starter attitude, dealing with uncertainty and combining a strategic product mindset with a focus on execution.

If you feel as if you belong in a product-first company, want to work with a world-class team of designers and developers, and deliver the future of B2B software, we should talk!

As a Senior Engineer at Factorial, you'll be part of a team of 200+ Product Engineers.
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. We have offices in Barcelona and Madrid so as long as you’re willing to in our Barcelona offices, or mixing both.

Our stack is Ruby on Rails and React.

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.

How We Work 💻 (Barcelona or Madrid Office)

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 Engineering Teams follows an office‑first, flexible approach.

We work on‑site several days a week, 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 - 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.

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

• 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.
• 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!
• 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?"
• 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.
• 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.
• Teamwork Ease
  :
  We collaborate well, adapt easily, and are open to feedback. We…