? Location: Barcelona, Spain (Hybrid)
? Employment: Full-time
? About Our Client
Our client is building the AI platform that will redefine the future of hardware engineering.
Their product brings together system architecture, requirements, verification, and engineering workflows into one intelligent platform, helping engineering teams design and build the world's most advanced hardware systems faster and more efficiently.
From aerospace and defense to robotics, transportation, and semiconductor technologies, they're creating the AI infrastructure that will power the next generation of engineering.
This is an early-stage company where every engineer has a direct impact on the product, the technology, and the future of the business.
? About the Role
As a Senior Full-Stack Software Engineer, you'll work directly with the founders and technical leadership to build a next-generation AI product from the ground up.
This is a highly hands-on engineering role where you'll own features end-to-end—from architecture and implementation to deployment and continuous improvement.



You'll collaborate closely with customers, help solve complex engineering challenges, and influence both product and technical decisions.
If you're excited by ownership, modern AI technologies, and building products that solve meaningful real-world problems, this is an opportunity to make a significant impact from day one.
? What You'll Do
Own product development from concept to production
Design and build scalable full-stack applications
Develop modern backend services and intuitive frontend experiences
Translate customer needs into elegant technical solutions
Write clean, maintainable, production-ready code
Collaborate directly with founders, engineers, and customers
Review code and contribute to engineering best practices
Improve infrastructure, CI/CD pipelines, cloud deployments, and observability
Build and integrate AI-powered capabilities across the platform
Help shape the engineering culture as the

📌 Senior Full-Stack Software Engineer (Barcelona)
🏢 OnHires
📍 Barcelona