Barcelona
At PropHero we are seeking a versatile AI Engineer to join our team and help us advance both classic Machine Learning models and cutting-edge generative AI systems. In this role, you’ll work across the full AI lifecycle: training, testing, and deploying models for regression, classification, and agent-based applications. You will design and optimize backend systems using AWS, integrate AI models with databases and APIs, and collaborate closely with data science, frontend and DevOps teams to deliver scalable, reliable, and secure solutions. Responsibilities: • Platform Engineering: Design and maintain backend systems (AWS, Python) to support both classic ML and GenAI workloads (LangChain, LangGraph)., • Model Development & Testing: Collaborate with Data Scientists to train, fine-tune, and evaluate ML models (regression, classification, GenAI). Build pipelines for testing, fairness, and reliable inference at scale., • Deployment & Integration: Deliver models as production-ready services; integrate with APIs, MCPs, vector databases, and external tools (e.g., HubSpot)., • Collaboration: Partner with frontend engineers for smooth API integrations and with DevOps to ensure scalable, secure deployments., • Observability & Reliability: Implement monitoring, logging, and evaluation tools to ensure accuracy, efficiency, and reliability of AI systems. Requirements: • Strong backend/software engineering skills in Python., • Hands-on experience with ML frameworks (e.g., scikit-learn, XGBoost) and GenAI libraries (LangChain, LangGraph, HuggingFace)., • Knowledge of regression, classification, and modern NLP/GenAI approaches., • Familiarity with vector databases (e.g., Pinecone, Weaviate, FAISS)., • Solid expertise in API design, system architecture, and backend development., • Experience working with AWS services and DevOps practices., • Focus on testing, evaluation, and reliable deployment of ML models., • Fluent English, as all our teams are distributed globally and we use English for all internal communications. Why PropHero: • Impact & Ownership: Your work will directly shape the data foundation that drives our business decisions and customer experience., • Cutting-Edge Stack: Build on a modern, cloud-native AWS data platform., • Growth Opportunities: Be part of a fast-scaling team with opportunities to lead data architecture and mentor others., • Healthy Business: €30M revenue in 4 years, 25% QoQ growth, already profitable. Diversity Statement At Prophero, we are committed to fostering an inclusive and equitable workplace where diverse perspectives and backgrounds are not only welcomed but celebrated. We believe that diversity drives innovation and empowers us to build stronger connections with our clients and communities. Prophero is an equal opportunity employer and is dedicated to ensuring a hiring process free from discrimination based on race, ethnicity, gender, age, disability, religion, sexual orientation, or any other characteristic protected by law. Our mission is to create a workplace where everyone feels valued, supported, and empowered to achieve their full potential.
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338 Carrer d'Aragó, L'Eixample, 08009, Barcelona
