Overview 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 / Ventajas 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 Type Script or equivalent language proficiency Experience with tests (unit, end-to-end) 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 Type Script or equivalent language Full-stack web development (front-to-back) Experience with AI agents in development workflows

📌 Full-Stack Engineer - Mainloop (Vallés)
🏢 Jobrapido
📍 Vallés