Senior Software Engineer - Finance Services

Factorial Hr; Madrid; Híbrido; EUR 85.000 - 120.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Health insurance

Remote flexibility (20%)

Wellhub gym & wellness

Cobee expense management

Language classes

Office breakfast & fruit

Nora discounts

Pet friendly workspace

Descripción de la vacante

Factorial HR is seeking a Senior Software Engineer to lead backend development in the Data Ops team. You’ll architect scalable systems connecting internal users, external clients, and financial workflows, embedding AI and driving agile practices. Office-first with 20% remote flexibility in Barcelona and Madrid.

Focus on reliability, security, and performance across internal sales, invoicing, and billing apps, while integrating global payment platforms and building production-ready APIs.

Formación

• 5+ years of professional backend or software engineering experience.
• Strong foundation in database management, Docker, and modern cloud infrastructure.
• Experience building reliable, secure, production-ready APIs and handling concurrency.
• Fintech or payments domain experience is valued.

Responsabilidades

• Own the backend architecture of internal sales, invoicing, and billing apps with high availability.
• Design robust backend workflows for critical financial data with reliability.
• Integrate payment platforms (Stripe/Adyen) to optimize internal flows.
• Build end-to-end products with design and product teams to meet user needs.
• Embed AI into workflows using GitHub and AI tools to accelerate development.

Conocimientos

5+ years backend

Docker

Cloud infra

APIs design

Fintech domain

AI in workflow

Agile

Herramientas

PostgreSQL

Docker

AWS

Descripción del empleo

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

• 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