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# Full-Stack Software Architect (Typescript + React)

- **Company:** Onhires
- **Location:** Zaragoza, Spain
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Artificial Intelligence, Amazon Web Services, Microsoft Azure, Cloud Computing, Software Quality, Continuous Integration, Relational Databases, Programming Tools, Github, PostgreSQL, Software Architecture, Cloud Services, Software Engineering, Systems Architecture, TypeScript, AI Infrastructure, ReactJS, Large Language Models, Multi-Agent Systems, Reliability of Systems, Backend, Build Management, AI Platforms, Front End Software Development, Virtual Agents, Api Design, Docker
- **Published:** August 7, 2026
- **Apply:** https://www.buscojobs.com.es/full-stack-software-architect-typescript-react-en-zaragoza-ID-366471987

## About the Role

Required
6-10 years of professional software engineering experience
Strong experience designing and owning production software architecture
Excellent TypeScript skills across the full stack
Strong backend architecture and API design experience
Experience with React or another modern frontend framework
Deep knowledge of PostgreSQL or other relational databases
Experience with Docker, CI/CD, and cloud platforms (AWS, GCP, or Azure)
Strong understanding of scalability, security, testing, observability, and system reliability
Proven ability to take products from idea to production
High ownership and comfort working in an early-stage startup
Experience using AI development tools and modern LLM workflows
Strong communication skills and fluent English
Based in Barcelona or willing to relocate
Right to work in the EU without visa sponsorship
Nice to Have
Founding or early-stage startup experience
Experience leading technical direction or acting as a Software Architect
Experience building AI-powered products
Knowledge of RAG, vector databases, multi-agent systems, or MCP
Interest in aerospace, defense, robotics, semiconductor, automotive, or other advanced engineering industries

## Description

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, technology, and the future of the business.About the RoleAs aFull-Stack Software Architect, you'll work directly with the founders to help build both the product and the engineering organization from day one.This 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.You'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.If 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.What You'll DoOwn product development from concept to productionDesign scalable system architecture and engineering standardsBuild modern full-stack applications and backend servicesOwn infrastructure, cloud deployments, CI/CD, and observabilityWork directly with founders, customers, and industry partnersTranslate customer needs into product decisionsBuild AI-powered capabilities across the platformHelp establish engineering processes, code quality, and development cultureContribute to hiring and mentoring future engineersRepresent the company at customer meetings and industry eventsWhat We're Looking ForRequired6-10 years of professional software engineering experienceStrong experience designing and owning production software architectureExcellent TypeScript skills across the full stackStrong backend architecture and API design experienceExperience with React or another modern frontend frameworkDeep knowledge of PostgreSQL or other relational databasesExperience with Docker, CI/CD, and cloud platforms (AWS, GCP, or Azure)Strong understanding of scalability, security, testing, observability, and system reliabilityProven ability to take products from idea to productionHigh ownership and comfort working in an early-stage startupExperience using AI development tools and modern LLM workflowsStrong communication skills and fluent EnglishBased in Barcelona or willing to relocateRight to work in the EU without visa sponsorshipNice to HaveFounding or early-stage startup experienceExperience leading technical direction or acting as a Software ArchitectExperience building AI-powered productsKnowledge of RAG, vector databases, multi-agent systems, or MCPInterest in aerospace, defense, robotics, semiconductor, automotive, or other advanced engineering industriesYou'll work with modern technologies including:TypeScriptReactREST / tRPC APIsDockerGitHub Actions / CI/CDAI development tools and LLM workflowsRAG, Vector Databases, and Agentic AIBecome one of the first engineers shaping the company's futureWork directly with experienced founders and technical leadersOwn architecture, product decisions, and engineering standardsBuild AI-native software solving real engineering challengesCompetitive salary plus meaningful equityHelp define the engineering culture and grow the team from the ground upAdditional InformationHybrid role based inBarcelona, 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#J-*****-Ljbffr


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