Location: Barcelona, Spain (Hybrid)Employment: Full-timeABOUT OUR CLIENTOur 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 ROLEAs 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 DOOwn product development from concept to productionDesign and build scalable full-stack applicationsDevelop modern backend services and intuitive frontend experiencesTranslate customer needs into elegant technical solutionsWrite clean, maintainable, production-ready codeCollaborate directly with founders, engineers, and customersReview code and contribute to engineering best practicesImprove infrastructure, CI/CD pipelines, cloud deployments,



and observabilityBuild and integrate AI-powered capabilities across the platformHelp shape the engineering culture as the team growsWHAT WE'RE LOOKING FORREQUIRED3-6+ years of professional software engineering experienceStrong experience building production SaaS applicationsExcellent TypeScript skills across the full stackExperience with React (or another modern frontend framework)Strong backend development experience and API designSolid understanding of PostgreSQL or other relational databasesExperience with Docker, CI/CD, and cloud infrastructure (AWS, GCP, or Azure)Strong debugging, analytical, and problem-solving skillsProduct mindset with the ability to take ownership from idea to deliveryComfortable working in a fast-moving startup environmentExperience using AI development tools and modern LLM workflowsFluent EnglishBased in Barcelona or willing to relocateNICE TO HAVEStartup or founding engineering experienceExperience building AI-powered applicationsKnowledge of RAG, vector databases, or multi-agent systemsEnterprise SaaS experienceInterest in aerospace, robotics, semiconductor, automotive, or other advanced engineering industriesTECH STACKTypeScriptReactPostgreSQLREST / tRPC APIsDockerGitHub Actions / CI/CDAWS, GCP, or AzureAI development tools and LLM workflowsWHY JOIN?Build a category-defining AI platform from an early stageWork directly with experienced founders and technical leadersOwn meaningful product decisions and features from day oneSolve challenging engineering problems with real-world impactCompetitive salary plus meaningful equityJoin a high-performing team where your work will directly shape the future of the companyADDITIONAL INFORMATIONHybrid role based in Barcelona, SpainApplicants must have the right to work in the EUSome projects may require eligibility for NATO security clearance due to collaboration with aerospace and defense organizationsLanguage learning is supported by the company
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📌 Senior Full-Stack Software Engineer (Barcelona)
🏢 OnHires
📍 Barcelona