AI Software Engineer Senior, Castilla León
Castilla León, Spain
AI Software Engineer – LLMs & Product Engineering (Remote – Spain)
Are you coming from the software engineering world and caught the bug of language models? Are you excited to build real AI products that operate in production, at scale, and are robust? If so, this position is for you.
About our client
We are collaborating with a company specialized in AI solutions focused on automation and operational efficiency. Their approach combines cutting-edge technology with a deep understanding of real business challenges, developing tools that optimize processes, strengthen decision-making, and enhance user experience.
With a multidisciplinary team and a strong passion for innovation, they help organizations of all sizes integrate AI in an ethical, scalable, and strategic manner. Here, AI is built with real impact in mind.
You will be responsible for designing, building, and maintaining robust and scalable AI agents used in production by large companies and innovative startups. This is not about demos or PoCs: you will build meaningful AI products with a direct business impact, automating complex processes and improving user experience.
Your key missions:
* Build production AI agents using LLMs (GPT, Claude, Gemini…) integrated with real business tools and workflows.
* Design and evolve the complete lifecycle of the agent (ADLC): from pilot testing to deployment and continuous improvement.
* Collaborate with leading companies in sectors like finance, healthcare, or telecommunications, helping them scale AI ethically and efficiently.
* Identify opportunities, design solutions, and guide the development of the client's core platform.
* Prototype new architectures, explore voice model integration, and design generalizable frameworks for multi-case AI agents.
* Over 5 years of experience as a Software Engineer, with practical expertise in TypeScript/Node.js, Go, or Python in production environments.
* Hands-on experience building products based on language models (LLMs): prompt engineering, tool/function calling, output evaluation, API and system integration.
* Solid understanding of pipelines like RAG, embeddings, and semantic search (e.g., Pinecone, Weaviate).
* Experience with agent frameworks such as LangChain, CrewAI, OpenAI SDK or similar.
* Good engineering practices: testing, CI/CD, containers, DevOps, version control, modular design, scalability.
* Knowledge of privacy and sensitive data management (PII) applied to AI.
Bonus if you have also worked with:
* Voice or real-time conversational agents (SSE, WebSockets).
* Multi-agent protocols like MCP or A2A, supervisor/critical patterns.
* Sectors with complex user-system interaction: e-commerce, telecom, banking, customer service.
* You are a product engineer obsessed with real impact, not hype.
* High technical judgment and autonomy: knowing when to code and when to redesign.
* You are passionate about AI but also grounded in solid software fundamentals.
* You communicate well and collaborate with diverse stakeholders, from CTOs to business stakeholders.
Where and how?
100% remote from anywhere in Spain
Flexible hours and distributed team
Projects with real impact, autonomy, and cutting-edge technology
Excited to build the future with LLMs, but with production-ready code?
Join the team and stop making demos: start building products.
If this position isn't a fit for you, check other opportunities on our website:
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