Senior AI Engineer FREELANCE
hace 9 horas
Alicante
Senior AI Engineer At Hays, we are partnering with a leading technology-driven company to support the development and scaling of advanced AI systems in production. The mission is to design, build, and optimize agentic AI systems within a multi-tenant SaaS environment, leveraging modern orchestration frameworks and LLM technologies to deliver robust, scalable, and high-quality solutions. These systems involve multi-agent architectures, supervisor–specialist routing, MCP integrations, human-in-the-loop workflows, and strong evaluation and observability practices. What you will do • Design and build production LLM-based systems, • Architect and implement multi-agent workflows using orchestration frameworks (LangGraph preferred), • Develop agent-to-agent communication and integrate tools, APIs, and MCP servers, • Collaborate with PMs to define requirements and translate them into scalable systems, • Own end-to-end delivery including architecture, implementation, and deployment, • Design and maintain evaluation frameworks including golden datasets, offline evaluations, online monitoring, and LLM-as-a-judge, • Implement observability practices including tracing, prompt/output logging, latency, cost, and guardrails, • Optimize systems for performance, cost efficiency, and reliability, • Build and maintain human-in-the-loop workflows in production What we are looking for • Relevant experience building production LLM systems (typically 3+ years in AI/ML roles), • Hands-on experience building or operating multi-agent systems in production environments, • Proven experience shipping LLM systems to real users (no PoCs or hackathons), • Strong ability to design AI systems end-to-end, from requirements to deployment, • Ability to work autonomously, propose architectures, evaluate trade-offs, and drive technical decisions with minimal supervision, • Experience with orchestration frameworks such as LangGraph (preferred) or LangChain, • Deep expertise in LLM evaluation frameworks, including golden datasets, offline and online evaluation, quality monitoring, and regression analysis, • Experience with AI observability tools such as Arize, LangSmith, Braintrust, or similar (tracing, logging, eval pipelines), • Experience with agent-to-agent communication, tool orchestration, or MCP integrations, • Experience building systems in multi-tenant or scalable SaaS environments, • Strong understanding of retrieval (RAG) and conversational agents is a plus, • Experience optimizing systems under real-world latency and cost constraints, • English working proficiency What we offer • Freelance contract through Hays (6 months, with strong potential for extension), • Full-time engagement, 100% remote, with the flexibility to work from anywhere in Spain, • Highly competitive daily rate, reflecting top-tier market standards, • Opportunity to build and scale cutting-edge production AI systems with real user impact, • International and highly collaborative engineering environment 💡 If youre passionate about building advanced LLM solutions, working with agentic architecture, and being part of a collaborative and forward-thinking team, we’d love to hear from you.