Senior AI Backend Engineer - Siemens Mobility

Senior AI Backend Engineer Hiire is supporting an international industry-leading client in the search for a Senior AI Software Engineer to join a team focused on building enterprise-grade AI solutions with direct impact on critical business operations and workflows. This is an opportunity to work in a highly technical and multidisciplinary environment where AI, software engineering, and product thinking come together to create scalable solutions for real-world problems. We are looking for someone with a hands-on mindset, strong production focus, and experience turning AI prototypes into robust and reliable systems. What You’ll Do Collaborate closely with engineering, operations, and business stakeholders to understand workflows, identify pain points, and design AI-driven solutions with measurable impact. Translate complex requirements into scalable AI-enabled services and technical concepts. Contribute directly to the design and architecture of systems powered by LLMs and retrieval technologies. Build AI Systems for Production Develop and maintain scalable, production-grade AI services focused on: LLMs RAG pipelines Hybrid retrieval Semantic search Vector search Agentic workflows Build backend APIs, data pipelines, and integrations while ensuring reliability, observability, and engineering best practices. Own the full development lifecycle: architecture, implementation, testing, deployment, and monitoring. AI Evaluation, Prompt Engineering & Data Quality Design rigorous evaluation strategies for AI output quality, retrieval accuracy, and model behavior. Treat prompt engineering as an engineering and experimentation discipline. Ensure high standards for data quality and contextual grounding across AI systems. Mentor junior team members on AI engineering, experimentation, and evaluation practices. What We’re Looking For 5+ years of experience in Software Engineering, with strong exposure to AI, NLP, or Information Retrieval. Proven experience building and operating AI solutions in production and enterprise environments. Ability to bridge experimental Data Science workflows with reliable and maintainable software engineering practices. Technical Skills Strong proficiency in modern Python (3.11+), including: async/await typing Pydantic Experience with: Docker CI/CD testing frameworks (pytest) code quality tooling (ruff, mypy) Git workflows and code reviews Hands-on experience with: LLMs Prompt Engineering RAG GraphRAG Vector databases / OpenSearch AI evaluation pipelines Nice to Have Experience with AWS Bedrock or Azure OpenAI. Familiarity with MCP (Model Context Protocol) and modern AI interface standards. If you’re looking for an opportunity to work on applied AI in a serious, scalable, and impactful environment, this could be a very exciting next step. Locations Lisbon Remote status Hybrid Lisbon About Hiire We are based in Estonia and Cyprus, and we operate globally. We love to work remotely and travel the world. Having freedom, ownership and passion for recruitment are key for us. We hire amazing tech talent for great companies We coach highly motivated Professionals to get better careers We empower recruiters to hire more and better Talent. Do you want to help us to grow? Founded in 2022 Co-workers 9