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, technology, and the future of the business.

ABOUT THE ROLE

As 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.

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 DO

Own product development from concept to production





Design scalable system architecture and engineering standards

Build modern full-stack applications and backend services

Own infrastructure, cloud deployments, CI/CD, and observability

Work directly with founders, customers, and industry partners

Translate customer needs into product decisions

Build AI-powered capabilities across the platform

Help establish engineering processes, code quality, and development culture

Contribute to hiring and mentoring future engineers

Represent the company at customer meetings and industry events

WHAT WE'RE LOOKING FOR
REQUIRED

1. 10 years of professional software engineering experience

Strong experience designing and owning production software architecture

Excellent Type Script 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

TECH STACK

You’ll work with modern technologies including:

Type Script

React

PostgreSQL

REST / tRPC APIs

Docker

Git Hub Actions / CI/CD

AWS, GCP, or Azure

AI development tools and LLM workflows

RAG, Vector Databases, and Agentic AI

WHY JOIN?

Become one of the first engineers shaping the company's future

Work directly with experienced founders and technical leaders

Own architecture, product decisions, and engineering standards

Build AI-native software solving real engineering challenges

Competitive salary plus meaningful equity

Help define the engineering culture and grow the team from the ground up

ADDITIONAL INFORMATION

Hybrid role based in Barcelona, Spain

Applicants must have the right to work in the EU

Some projects may require eligibility for NATO security clearance due to collaboration with aerospace and defense organizations

Language learning is supported by the company

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