Software Engineer jobs in Spain

As a Senior Engineer, you will:

Help define how humans collaborate with intelligent systems in one of the largest and most underserved industries in the world: property management.

You’ll shape the technical foundation of a platform that is not just supporting human workflows, but executing them autonomously through AI agents. This is a rare opportunity to influence how an entire industry evolves, building tools that transform repetitive operational tasks into seamless, intelligent experiences.

Your work will directly contribute to how trust is built between humans and machines, how operations scale without added headcount, and how residents and staff experience a new, AI-powered standard of service.

We’re not just building software we’re designing AI that people want to work with. Delightful, trustworthy, and deeply effective.

Join us to help lead the AI revolution in multifamily, drive meaningful real-world impact, and be part of reimagining what work can feel like when done side-by-side with intelligent agents.

You will be a cornerstone of our engineering organization, reporting to the VPE. This is a pivotal role where you'll lead critical system rewrites, architect scalable foundations for our AI platform, and establish the technical standards that will shape our engineering culture for years to come.

You'll work at the intersection of cutting-edge LLM technology and practical business applications, creating sophisticated systems that power our AI leasing agent while building self-serve experiences that enable rapid customer onboarding. As our first US-based engineer, you'll bridge the gap between our product vision and technical implementation.

This role offers a rare opportunity to directly influence how we architect the next generation of our platform. You'll tackle projects like rebuilding our onboarding/configuration system to be self-serve, creating robust analytics infrastructure to measure AI performance, and reimagining our integration framework to connect seamlessly with customer systems. Your work will significantly reduce manual engineering overhead while enabling rapid scaling of our customer base.

We're looking for a Senior Engineer to help us bring that future to life.

This is not just another dev role. You'll be hands-on shaping the technical DNA of Zuma. You'll architect critical systems, tame legacy code, build net-new AI-powered experiences, and lay down the patterns future engineers will inherit. If you're obsessed with building real products people use, especially products powered by LLMs, this might be your playground.

Why This Could Be Your Dream Role

• You'll work directly with cutting-edge LLM technology in a real-world application

• You want to work at a company where customers feel your impact every day

• You'll architect AI-powered systems that are transforming the real estate industry

• You'll have autonomy to design and implement innovative technical solutions

• Your work will directly impact thousands of apartment communities and millions of renters

• You'll receive significant equity in a venture-backed company with strong traction

• As we scale, your role and influence will grow with the company

Why You Might Want to Think Twice

• This is a demanding role that will often require extended hours and deep commitment

• As a founding team member, you'll need to wear multiple hats and step outside your comfort zone

• You'll need to make thoughtful tradeoffs between innovation and immediate needs

• You'll interact directly with customers to understand their needs and occasionally travel to their offices

• We're a startup - priorities can shift rapidly as we respond to market opportunities and customer needs

• If you're not comfortable getting your hands dirty with legacy code or speaking directly with customers, this isn't the job for you

Responsibilities

• Lead critical system rewrites to transform our architecture into a highly scalable, resilient foundation

• Own the design and performance optimization of our data storage systems, ensuring they scale with customer and AI demands

• Build and evolve our deployment pipelines, enabling reliable, automated releases for AI-first products

• Set up and manage modern cloud infrastructure from scratch, leveraging Infrastructure as Code (IaC) to ensure consistency, security, and scalability

• Establish engineering best practices, including observability, incident response processes, and system hardening for an AI-first platform

• Drive robust analytics and monitoring to track performance, reliability, and the effectiveness of our AI solutions

• Mentor engineers and elevate the team's capabilities across infrastructure, scalability, and AI product development

Your Experience Looks Like

• Bachelor’s or Master’s degree in Computer Science, Engineering, or a related technical field

• 3+ years of experience building production-grade software systems, with a focus on scalability, performance, and reliability

• Proven expertise in backend development with Node.js, including API design, system architecture, and cloud-based services

• Experience with cloud infrastructure (AWS, GCP, or similar) and deploying production systems using Infrastructure as Code (e.g., Terraform, Pulumi)

• Hands-on experience with database design, performance tuning, and scaling high-throughput data systems

• Familiarity with building and maintaining CI/CD pipelines, automated testing, and modern DevOps practices

• Strong communication skills and ability to work effectively in a distributed, fast-paced environment

• Comfortable operating in early-stage, high-ownership environments with evolving requirements

• Bonus: Experience with React and TypeScript on the frontend, though this role leans backend/infrastructure

• Bonus: Exposure to LLM-based systems, AI infrastructure, or agentic AI workflows