Barcelona, Spain — hybrid
Full-time employment
0.5–1% equity
About Our Client Our client is an early-stage technology company building an AI-native platform for complex hardware engineering.
The platform brings system architecture, requirements, verification, engineering workflows, and technical decisions into one traceable environment. It provides engineers and AI agents with the context required to design, validate, and evolve complex hardware systems more effectively.
The technology can be applied across aerospace, defence, robotics, transportation, semiconductors, and other advanced engineering industries.
The product is already live and used by customers. The company is now preparing for its next stage of growth, including a planned seed funding round in autumn 2026.
The team currently consists of two founders supported by an external engineering team. This hire will become the first senior technical leader brought fully in-house.




About the Role Our client is looking for a deeply hands-on software architect who can become the technical reference point for the product and the future engineering team.
You will work directly with the founders, take ownership of the existing architecture and production environment, and gradually assume responsibility currently held by an external software architect.
This is not an enterprise architect or people-management position. You will spend most of your time designing, building, reviewing, debugging, and shipping production software.
You will also own the decisions behind the implementation: how services and data models should be designed, which technologies are appropriate, where strong foundations are necessary, and where a simpler solution is better.
As the company grows, you will help hire the first internal engineers, establish the engineering culture, and have the opportunity to develop into a broader technical leadership role.
What You Will Do
- Take technical ownership of the existing product and production environmen

📌 Founding Software Architect (Cataluña)
🏢 OnHires
📍 Cataluña