Software Engineer, Agent (Spanish speaking)

Sierra is seeking a Software Engineer, Agent (Spanish speaking) to design and deliver production-grade AI agents for large enterprises. The role involves full ownership of the agent development life cycle from pilot to deployment, working directly with customers to understand their needs, and building scalable AI systems in production. The engineer will also partner with startups in London and contribute to the evolution of Sierra's platform. This is an in-person role based in London.

Must have experience building and scaling production systems, strong problem-solving skills, a builder mindset, customer-facing comfort, and fluency in Spanish and English. Nice to have: experience with AI/LLM systems, founder or founding engineer background, familiarity with eval frameworks, agent tooling, RAG, prompt engineering, and experience with React, TypeScript, or Go.