AI-Driven Full-Stack Product Engineer

Leyton; Sant Cugat del Vallès; On-site; EUR 60,000 - 90,000; Full time

Job summary

Mainloop Barcelona is seeking a Full-Stack Product Engineer to own end-to-end product development in a Barcelona-based, AI-native team. You will shape the roadmap, build and ship features, and measure impact with users and stakeholders across multiple countries.

You will work closely with Product Owners, engineers, and AI agents to deliver fast, reliable software that users love. The role emphasizes collaboration across frontend and backend, strong TypeScript skills, and fluency in English to

Qualifications

• Shipped a real product with users and gathered feedback
• Experience across front-end and back-end of a web app
• Strong TypeScript skills and modern frontend tooling
• Excellent written and spoken English; comfortable with cross-country collaboration

Responsibilities

• Own a product end to end from ideation to release and metrics
• Collaborate with Product Owner and engineers to align on roadmap and build
• Work with AI agents and Claude tooling to accelerate delivery
• Engage with global teams and users to understand needs and measure impact

Skills

Full-stack development

TypeScript

Product ownership collaboration

English fluency

Tools

Claude AI

Job description

Mainloop Barcelona is seeking a Full-Stack Product Engineer to own end-to-end product development in a Barcelona-based, AI-native team. You will shape the roadmap, build and ship features, and measure impact with users and stakeholders across multiple countries.

You will work closely with Product Owners, engineers, and AI agents to deliver fast, reliable software that users love. The role emphasizes collaboration across frontend and backend, strong TypeScript skills, and fluency in English to