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.no on-call policyopportunity to work with AI agents and toolinggrowth through cross-project ownershipinternational exposureclear ownership of product incidents during work hoursOwn the build, architecture, quality and release of a productTake over and own a product end-to-end after documentation and handoffDecide what to build next in collaboration with the Product OwnerWork across a portfolio of platforms, agent-native products and internal toolingReview merges via agent-assisted loop and ensure 100% passing testsDesign with AI agents to balance quality and speed,



and judge outputs criticallyMentor teammates and contribute to evolving engineering processes and standardsContribute to defining the standard stack and participate in architectural governanceOwnership of production software experienceFront-end and back-end working proficiencyStrong TypeScript or equivalent language proficiencyExperience with tests (unit, end-to-end) and test strategyFamiliarity with coding agents and evaluating agent outputAbility to understand unfamiliar codebases and explain their purposeWillingness to work in Barcelona and participate in a team-building environmentStrong judgement and decision-makingProactive collaboration with Product Owner and teammatesMentoring and knowledge sharingTypeScript or equivalent languageFull-stack web development (front-to-back)Experience with AI agents in development workflowsFull-Stack Engineer - Mainloop - barcelona • barcelona, catalunya, es
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📌 Full-Stack Engineer - Mainloop - Barcelona
🏢 Leyton Et Associes
📍 Barcelona