Senior Software Engineer - Finance Services

The Role

We are looking for a Senior Software Engineer to join our Data Ops team. In this role, you will lead the backend development of our internal applications, which directly impact Factorial’s sales and billing ecosystems.Your mission is to engineer highly resilient, scalable backend systems and robust cloud architectures that connect internal users, external clients, and financial workflows. You won't be managing data lakes or core data warehouses; instead, you will own the full product lifecycle from architecture to deployment. If you think product-first, value system stability, and want to leverage AI in your daily development workflow, this is for you!

What will you do?

• Own the backend architecture of internal sales, invoicing, and billing applications, ensuring maximum availability, security, and performance using a modern cloud stack.
• Design and maintain robust backend workflows capable of handling critical financial data with high reliability and fault tolerance.
• Integrate global payment platforms and APIs (such as Stripe or Adyen) to optimize our internal financial flows.
• Develop end-to-end products with strong support from our design and product teams, ensuring applications meet the needs of both internal and external users.
• Embed AI into your workflow using GitHub and modern AI tools to accelerate development and build smart agents.
• Drive agile practices within the team, participating in structured Pull Request reviews, continuous deployment, and collaborative specifications.

Your Profile

• Experience: You have 5+ years of professional experience as a Backend or Software Engineer.
• Tech Stack: Strong foundation in database management, Docker containers, and modern cloud infrastructure architecture. You are language-agnostic and focused on choosing the best tool for the job.
• Backend Robustness: Deep understanding of building reliable, secure, and production-ready APIs, handling concurrency, data integrity, and system monitoring.
• Domain Knowledge: Background in fintech, payment platforms, or financial applications is highly valued.
• Product-First Thinking: You understand why an application is built, how it adapts to clients, and how it impacts the business.
• AI as a Habit: You actively leverage AI assistants and automation tools in your daily coding routine.
• Collaboration: Comfortable working with Agile methodologies, peer reviews, and cross-functional teams.

Bonus Points

• Experience developing or integrating AI agents.

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

About us

At Factorial, we’re building the leading business management software for companies of all sizes. Our platform centralizes 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, share it.

• We partner: Every decision is a team decision. We trust each other.

• We grow fast: We act fast. We think that the worst mistake is not learning from them.

• 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.

Wanna learn more about us? Check our website!

Perks of being part of our team

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!