ppLocation: Barcelona, Spain (Hybrid)br/Employment: Full-time /ph3ABOUT OUR CLIENT /h3pOur client is building the AI platform that will redefine the future of hardware engineering. /ppTheir 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. /ppFrom aerospace and defense to robotics, transportation, and semiconductor technologies, they're creating the AI infrastructure that will power the next generation of engineering. /ppThis is an early-stage company where every engineer has a direct impact on the product, the technology, and the future of the business. /ph3ABOUT THE ROLE /h3pAs 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. /ppThis 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. /ppIf 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. /ph3WHAT YOU'LL DO /h3ulliOwn product development from concept to production /liliDesign and build scalable full-stack applications /liliDevelop modern backend services and intuitive frontend experiences /liliTranslate customer needs into elegant technical solutions /liliWrite clean, maintainable, production-ready code /liliCollaborate directly with founders, engineers, and customers /liliReview code and contribute to engineering best practices /liliImprove infrastructure, CI/CD pipelines, cloud deployments,



and observability /liliBuild and integrate AI-powered capabilities across the platform /liliHelp shape the engineering culture as the team grows /li /ulh3WHAT WE'RE LOOKING FOR /h3h3REQUIRED /h3ulli3-6+ years of professional software engineering experience /liliStrong experience building production SaaS applications /liliExcellent TypeScript skills across the full stack /liliExperience with React (or another modern frontend framework) /liliStrong backend development experience and API design /liliSolid understanding of PostgreSQL or other relational databases /liliExperience with Docker, CI/CD, and cloud infrastructure (AWS, GCP, or Azure) /liliStrong debugging, analytical, and problem-solving skills /liliProduct mindset with the ability to take ownership from idea to delivery /liliComfortable working in a fast-moving startup environment /liliExperience using AI development tools and modern LLM workflows /liliFluent English /liliBased in Barcelona or willing to relocate /li /ulh3NICE TO HAVE /h3ulliStartup or founding engineering experience /liliExperience building AI-powered applications /liliKnowledge of RAG, vector databases, or multi-agent systems /liliEnterprise SaaS experience /liliInterest in aerospace, robotics, semiconductor, automotive, or other advanced engineering industries /li /ulh3TECH STACK /h3ulliTypeScript /liliReact /liliPostgreSQL /liliREST / tRPC APIs /liliDocker /liliGitHub Actions / CI/CD /liliAWS, GCP, or Azure /liliAI development tools and LLM workflows /li /ulh3WHY JOIN? /h3ulliBuild a category-defining AI platform from an early stage /liliWork directly with experienced founders and technical leaders /liliOwn meaningful product decisions and features from day one /liliSolve challenging engineering problems with real-world impact /liliCompetitive salary plus meaningful equity /liliJoin a high-performing team where your work will directly shape the future of the company /li /ulh3ADDITIONAL INFORMATION /h3ulliHybrid role based in Barcelona, Spain /liliApplicants must have the right to work in the EU /liliSome projects may require eligibility for NATO security clearance due to collaboration with aerospace and defense organizations /liliLanguage learning is supported by the company /li /ul /p #J-18808-Ljbffr

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