Imagine building a startup inside Factorial.

Let’s be clear: this is not a traditional software engineering role where you just clear Jira backlogs. We operate like a fast-paced, autonomous startup—but the products we build already have hundreds of demanding, daily active users relying on them to hit their revenue targets.
Our mandate is to hunt down internal frictions, conceptualize innovative solutions, and build the end-to-end product from scratch. You will be an active participant in product discovery, building entire ecosystems that drive real business value for Factorial's Account Management and Customer Support teams.

The Role: The Hybrid Engineer We are looking for a Mid-Level Full Stack Innovation Engineer (Mid 1 / Mid 2) to join our squad. This role is a unique hybrid: you are part Innovation Engineer (building net-new features) and part Site Reliability Guardian (ensuring the platform never goes down).

As our AI-driven models scale and the CX Workspace becomes the central operational hub for hundreds of internal users, the technical stakes are incredibly high. You will be responsible for the deliverability and scalability of the platform. You will build exciting new features, but your ultimate technical ownership will be ensuring our infrastructure performs flawlessly under heavy data loads.

What You Will Do (Responsibilities)
Part 1: Protecting the House (Reliability & Scalability)

• Site Reliability (SRE): Take ultimate ownership of the uptime, deliverability, and performance of the CX Workspace for hundreds of concurrent users.
• Cloud Infrastructure & Light DevOps: Manage our deployments within the Azure ecosystem. You will maintain CI/CD pipelines, monitor system health, implement caching (Redis), and optimize database queries to prevent latency.
• Data Flow Stability: Own the automated data pipelines bridging our Hub to the Data Gateway and HubSpot, ensuring zero-latency, rate-limit-conscious transfers.

Part 2: Building the Future (Innovation & Product)

• End-to-End Product Development: Build, maintain, and ship high-performance frontend interfaces using Next.js and robust backend microservices using NestJS.
• Problem Solving & Ideation: Participate in identifying workflow frictions. Help conceptualize the technical solutions and turn those ideas into fully functional internal products.
• Iterative Innovation: Participate in rapid prototyping. We build, we test with real users (Directors and AMs), and we iterate fast based on their feedback.

What We Are Looking For (Requirements)

• Experience: 3+ years of hands-on experience in full-stack web development, with a proven track record of supporting live platforms with active user bases.
• The Core Stack: Strong proficiency in TypeScript/JavaScript (SQL and Python are a strong plus).
• Frontend: Practical experience building responsive, server-side rendered (SSR) web applications using Next.js (React).
• Backend: Solid understanding of Node.js, specifically using the NestJS framework to build scalable server-side applications.
• Scalability & Infra: Practical knowledge of DevOps principles, CI/CD, and cloud infrastructure (Azure preferred). You know how to design systems that don't break when user volume spikes.
• Integrations: Direct experience building custom integrations with third-party APIs (HubSpot experience is a massive advantage).

The "Startup" Mindset

• Bias for Action + Respect for Stability: You prefer shipping a functional V1 and iterating, but you know exactly when to slow down and write proper tests so you don't break production for hundreds of users.
• Product-Minded Engineer: You don't just write code; you care deeply about the User Experience (UX) and the actual business pain you are solving.
• Eager to Learn: You are excited about the intersection of Data Engineering and AI, and want to learn how to connect traditional web apps to advanced intelligence models safely.

Why Join Us?

• The Best of Both Worlds: Get the thrill of building a 0-to-1 startup product, with the resources and scale of Factorial.
• Massive Impact: The tools you build and keep online will be used daily to secure millions in revenue and resolve critical customer pains.
• Technical Ownership: You won't just be a coder; you will own the deliverability and scalability of a flagship internal platform.
• Modern Architecture: Say goodbye to legacy spaghetti code. You will be building on a brand-new, cutting-edge Next.js/NestJS foundation.

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