AI Engineer - Agents

Labhouse is a Barcelona-based startup studio building AI-powered mobile apps used by hundreds of thousands of people worldwide. Our products, including Invoice Fly and Summary AI, are designed to make everyday tasks faster, smarter, and simpler through a subscription model that puts the user first.

We were founded by Andrés Bou and Horacio Martos, the duo behind SocialPoint (acquired by Take-Two Interactive), and we operate with the mindset of a product company: small teams, high ownership, and a relentless focus on building things that matter.

Would you like to make an impact as part of a company that builds the best mobile apps used by millions of users worldwide? If so, discover your next challenge below.

About the Role:

We’re bringing AI Agents into Summary AI and Invoice Fly, and you’ll be the one building them from scratch. This isn’t a role where you join an existing system and pick up tickets. You’ll own the whole cycle: decide what to build, design the architecture, implement it, measure how it performs with real users, and keep iterating until it works.

These won’t be thin wrappers around an LLM. You will build multi-agent systems that do real work for millions of users, and you’ll build the foundation underneath them: orchestration, tool use, context management, evaluation, and human-in-the-loop controls.

What You’ll Do

• Design and build our agent architecture from the ground up.

• Ship agentic features into Summary AI and Invoice Fly.

• Set up evaluations to measure quality, catch failures, and guide improvements.

• Iterate quickly based on real usage and data.

• Track the latest models, tools, and techniques, and bring the best ones into our products.

About You:

• You have 5+ years of experience building production systems.

• You’ve built agents that real people use, and you know what it takes to make them reliable.

• You take full ownership, from a blank page to production and beyond. You make the architecture decisions yourself and see them through.

• You know how to evaluate AI systems, not just build them, and you use data to decide what to fix next.

• You keep up with AI. You try new models and tools as they come out, and you know which ones are worth adopting.

• You ship fast and iterate, without lowering the bar on quality.

• You communicate clearly with everyone you work with. You explain technical tradeoffs clearly, listen to what each team needs, and keep everyone aligned.

Problem-solving and product focus:

• Excellent problem-solving and analytical skills, with the ability to resolve complex technical challenges.

• Eye for detail and a product-first mindset, with a passion for creating exceptional user experiences.

• Self-driven, entrepreneurial attitude with the ability to work autonomously and take ownership of projects.

• Excellent communication skills.

Nice to Have:

• Experience with subscription apps or mobile products

• Contributions to open-source AI tooling

What we Offer:

• Remote work from anywhere in Spain. If you are based in Barcelona, we would love for you to join us at the office (Barcelona Tech City) at least two days a week.

• Flexible working hours.

• High-end equipment for your development.

• Permanent contract with competitive compensation.

• A young and top entrepreneurial team in a dynamic startup environment.

• Opportunity to lead, grow, and take on big challenges.

Hiring Process

1. Initial Interview: Meet with our Talent Acquisition Lead to discuss your background and fit for the role. We’ll also ask you to share your proudest projects.

2. Hiring Manager Interview: A deep dive into your experience.

3. Technical Assessment: Showcase your expertise through a practical task.

4. Final Interview: A conversation with our leadership team to align on vision and expectations.

5. Offer: Join our team and lead the development of our future-shaping apps!

You should Know:

Labhouse is proud to be an equal-opportunity employer. However you identify or whatever your journey to this point, we welcome all candidates to apply for the position that inspires them.

Come join us and help us build a company that everyone is proud to be part of.