AI Engineer

AI Engineer join the team Make an impact by working in sectors where technology is the enabler and innovation is the key. At Celfocus, we make data actionable through Next‑Gen Intelligence - where data, AI and human creativity come together. You’ll work with multidisciplinary teams and partner with leading companies to turn data into decisions, agility and long‑term value. Explore your way in. The opportunity: The AI Engineer is responsible for building AI-powered applications and systems that use foundation models, language models, enterprise data, tools, and business workflows to drive business outcomes. They are focused on designing reliable, secure, and maintainable AI solutions. The AI Engineer understands that the quality of AI systems depends on model capabilities, context, tools, evaluation, integration, and operational control. Your day-to-day: Design and implement AI-powered applications and agentic workflows; Engineer model interaction layer, including instructions, context, retrieval, grounding, memory, tool use, and API/function calling patterns; Build and maintain AI application harnesses, evaluation datasets, test suites, and feedback loops; Integrate foundation models, APIs, enterprise systems, knowledge bases, and workflow tools; Implement guardrails, human-in-the-loop flows, access controls, auditability, and responsible AI practices; Monitor AI application quality, reliability, latency, cost, usage, and user feedback; Stay up to date with the latest trends and advancements in foundation models, AI engineering, context engineering, and agentic systems. What you'll bring: Proficiency in Python and/or other software engineering languages; Knowledge of LLMs , foundation models, prompt/context engineering , RAG , embeddings , vector databases , tool calling , and agent orchestration ; Experience with APIs , cloud services , a pplication integration , testing , CI/CD , and observability ; Understanding software design principles, security, privacy, data governance, and responsible AI; Ability to design evaluation harnesses and monitor metrics for AI systems; Strong problem-solving and system-thinking skills; Strong communication and collaboration skills; Ability to translate ambiguous business needs into testable AI behavior; Ability to work in a fast-paced, agile environment. What’s in it for you: • Hybrid way of working with flexibility and balance • Opportunity to work on international projects • Possibility to explore different roles and career paths • Continuous learning and development opportunities • A growing AI‑driven environment, working with the latest technologies • A set of benefits and perks to support your day-to-day A place for everyone At Celfocus, we are committed to cultivate a diverse and inclusive workplace. As an equal-opportunity employer, we welcome applicants of all backgrounds, gender identities, and abilities. If you require any adjustments during the selection process, please inform our Talent Acquisition Team. Department SH Artificial Intelligence Role AI Engineer Locations Lisbon , Porto Work Model Hybrid Seniority Experienced Professional Lisbon Porto About Celfocus Celfocus is pioneering the future of business through Next-Gen Intelligence - the convergence of data, AI, and human creativity to build more autonomous and adaptive organisations. Guided by our core belief - Making Data Actionable - we partner with leading companies to co-create intelligent solutions that turn data into insight, agility, and business value. Operating in over 25 countries, we bring together business experts, data scientists, and AI engineers to turn complexity into clarity and vision into measurable impact. Founded in 2000, Celfocus is part of Novabase, listed on Euronext Lisbon. To know more, visit www.celfocus.com