ppLocation: Barcelona, Spain (Hybrid)br/Employment: Full-time /p h3ABOUT OUR CLIENT /h3 pOur client is building the AI platform that will redefine the future of hardware engineering. /p pTheir 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. /p pFrom aerospace and defense to robotics, transportation, and semiconductor technologies, they're creating the AI infrastructure that will power the next generation of engineering. /p pThis is an early-stage company where every engineer has a direct impact on the product, technology, and the future of the business. /p h3ABOUT THE ROLE /h3 pAs a Full-Stack Software Architect, you'll work directly with the founders to help build both the product and the engineering organization from day one. /p pThis is far more than a senior engineering role. You'll define technical direction, influence architecture, establish engineering standards, and make key product decisions while remaining deeply hands-on. /p pYou'll own significant parts of the platform, work directly with customers, contribute to strategic decisions, and help build the engineering culture as the company scales. /p pIf you're excited about solving difficult technical challenges, building AI-native products, and creating something from the ground up, this is an opportunity to make a lasting impact.



/p h3WHAT YOU'LL DO /h3 ul liOwn product development from concept to production /li liDesign scalable system architecture and engineering standards /li liBuild modern full-stack applications and backend services /li liOwn infrastructure, cloud deployments, CI/CD, and observability /li liWork directly with founders, customers, and industry partners /li liTranslate customer needs into product decisions /li liBuild AI-powered capabilities across the platform /li liHelp establish engineering processes, code quality, and development culture /li liContribute to hiring and mentoring future engineers /li liRepresent the company at customer meetings and industry events /li /ul h3WHAT WE'RE LOOKING FOR /h3 h3REQUIRED /h3 ul li6-10 years of professional software engineering experience /li liStrong experience designing and owning production software architecture /li liExcellent TypeScript skills across the full stack /li liStrong backend architecture and API design experience /li liExperience with React or another modern frontend framework /li liDeep knowledge of PostgreSQL or other relational databases /li liExperience with Docker, CI/CD, and cloud platforms (AWS, GCP, or Azure) /li liStrong understanding of scalability, security, testing, observability,



and system reliability /li liProven ability to take products from idea to production /liliHigh ownership and comfort working in an early-stage startup /li liExperience using AI development tools and modern LLM workflows /li liStrong communication skills and fluent English /li liBased in Barcelona or willing to relocate /li liRight to work in the EU without visa sponsorship /li /ul h3NICE TO HAVE /h3 ul liFounding or early-stage startup experience /li liExperience leading technical direction or acting as a Software Architect /li liExperience building AI-powered products /li liKnowledge of RAG, vector databases, multi-agent systems, or MCP /li liInterest in aerospace, defense, robotics, semiconductor, automotive, or other advanced engineering industries /li /ul h3TECH STACK /h3 pYou’ll work with modern technologies including: /p ul liTypeScript /li liReact /li liPostgreSQL /li liREST / tRPC APIs /li liDocker /li liGitHub Actions / CI/CD /li liAWS, GCP, or Azure /li liAI development tools and LLM workflows /li liRAG, Vector Databases, and Agentic AI /li /ul h3WHY JOIN? /h3 ul liBecome one of the first engineers shaping the company's future /li liWork directly with experienced founders and technical leaders /li liOwn architecture, product decisions, and engineering standards /li liBuild AI-native software solving real engineering challenges /li liCompetitive salary plus meaningful equity /li liHelp define the engineering culture and grow the team from the ground up /li /ul h3ADDITIONAL INFORMATION /h3 ul liHybrid role based in Barcelona, Spain /li liApplicants must have the right to work in the EU /li liSome projects may require eligibility for NATO security clearance due to collaboration with aerospace and defense organizations /li liLanguage learning is supported by the company /li /ul /p #J-18808-Ljbffr

📌 Full-Stack Software Architect (Barcelona)
🏢 OnHires
📍 Barcelona