Overview
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In this role you will own production-grade software across a varied portfolio, partnering with a Product Owner to shape robust, scalable products. You’ll operate in an AI-native, agent-driven environment, translating business needs into well-architected solutions. You’ll frequently move between projects, influencing architecture, quality, and releases. This is a hands-on, strategic engineering role with a clear path to growing influence and a prestigious internal certificate upon demonstrated mastery.
Compensaciones / Incentivos
Mainloop Barcelona certificate
no on-call policy
opportunity to work with AI agents and tooling
growth through cross-project ownership
international exposure
clear ownership of product incidents during work hours
Responsabilidades
Own the build, architecture, quality and release of a product
Take over and own a product end-to-end after documentation and handoff
Decide what to build next in collaboration with the Product Owner
Work across a portfolio of platforms, agent-native products and internal tooling




Review merges via agent-assisted loop and ensure 100% passing tests
Design with AI agents to balance quality and speed, and judge outputs critically
Mentor teammates and contribute to evolving engineering processes and standards
Contribute to defining the standard stack and participate in architectural governance
Requisitos principales
Ownership of production software experience
Front-end and back-end working proficiency
Strong TypeScript or equivalent language proficiency
Experience with tests (unit, end-to-end) xqbhyrx and test strategy
Familiarity with coding agents and evaluating agent output
Ability to understand unfamiliar codebases and explain their purpose
Fluent English; Spanish useful
Willingness to work in Barcelona and participate in a team-building environment
Strong judgement and decision-making
Proactive collaboration with Product Owner and teammates
Mentoring and knowledge sharing
TypeScript or equivalent language
Full-stack web development (front-to-back)
Experience with AI agents in development workflows

📌 Full-Stack Engineer - Mainloop (San Cugat del Vallés)
🏢 Leyton Et Associes
📍 San Cugat del Vallés