Barcelona (Remote-first, hybrid when established)Type: Full-timeOur client, the UK's leading home improvement marketplace, is looking for a Senior Engineer to join their AI Product Innovation team in Barcelona. Rapidly prototype and test AI-powered features across internal tools and live marketplace experiencesCollaborate with Product, Design, Data, and Engineering teams to turn AI experimentation into real-world impactStrong software engineering background with production experienceHands-on experience with Python and TypeScriptExperience with AI systems, LLMs, or intelligent automation (projects or professional experience)APIs, performance, reliability, scalabilityExcellent communication skills in English (C1/C2)Background in marketplaces, consumer platforms, or data-rich productsExposure to cloud, ML infrastructure, or R&D/innovation environmentsWhat ́s in it for youRemote-first role, hybrid in Barcelona once team grows (~2 days/week in office)Flat structure with direct access to senior leadershipCareer growth, internal mobility, and professional development supportCompetitive benefits including social security, paid leave, sick leave, and parental leaveYou will join a well-established yet fast-evolving international tech company, trusted by millions of users and professionals.