About KLx KLx is the Portuguese subsidiary of Crédit Agricole S. A., a major international banking group delivering IT Skills & Software Development services to the group's global business lines. Our mission is to support the IT transformation of a worldwide bank, leveraging the expertise of our international campus in Lisbon. About Responsibilities At KLx, you will join our Generative AI perimeter, contributing to the backend infrastructure powering a suite of specialized AI assistants. Working in a collaborative model, you will design, build, and evolve backend systems that ensure performance, scalability, and seamless integration with AI‐driven capabilities. We're looking for a Senior Backend Developer – Generative AI who will architect and implement backend services, integrate AI frameworks, and collaborate closely with cross‐functional teams to deliver intelligent, high‐quality digital experiences. Key Responsibilities Develop and maintain robust, scalable backend systems supporting multiple AI assistants. Implement secure, well‐designed REST APIs, databases, and server‐side logic ensuring smooth performance and reliable data handling. Collaborate with front‐end teams to deliver cohesive, high‐quality user experiences tailored to each assistant's purpose. Integrate AI‐driven functionalities to enhance intelligence, automation, and responsiveness across helpdesk, HR, and back‐office operations. Participate actively in agile processes: code reviews, sprint planning, architectural discussions, and continuous improvement initiatives. About You! 5+ years of experience developing backend web applications using Python and frameworks such as Fast API. Strong proficiency in building and maintaining REST APIs and ensuring robust data integration. A growth mindset, with willingness to expand backend expertise and explore emerging technologies in the AI ecosystem. Ability to clearly explain complex technical concepts to non‐technical stakeholders. Experience working in an AI‐focused team, ideally with frameworks like Lang Chain or Lang Graph. Fluent in English. Desirable Familiarity with LLMs and cloud platforms, especially Azure, to support AI‐driven solutions. Understanding of machine learning and AI concepts to contribute to innovative integrations. What We Offer Competitive Salary + Bonuses + Flex Benefits + Health Insurance Hybrid working model (onsite + offsite) Modern open‐space office next to the Tagus River, 5 minutes from Metro/Train, 15 minutes from the airport Canteen (Breakfast + Lunch) Parking upon request (including EV charging) Free coffee, hot chocolate, fruit Training opportunities (Hard & Soft Skills) International environment with 15+ nationalities A people‐oriented, friendly, and collaborative workplace