About the Client Our client is an AI-native product company built to replace how billions of people manage their digital lives - starting with email, notes, and task tools that were never designed to be AI-native. It's backed by multi-million-dollar investment and built remote-first from day one, with a clear target: cut the time it takes users to get everyday things done by roughly 90%. That means solving the problems most AI products avoid - long-running workflows, persistent context, and reliable behavior under real-world, non-deterministic conditions. The team is small and high-talent-density by design, not by necessity, and moves at a pace that matches the scale of what it's building. About the Role As a Backend Engineer, AI, you'll own the inference and orchestration layer that powers every AI interaction in the product. Your work sits between models and users, where latency, correctness, reliability, and cost directly shape real-world experience. You'll build and operate production systems that turn model capability into fast, stable,



observable APIs used across mobile and desktop clients. What You'll Work On * Build and operate backend systems that serve AI-powered features in production * Design inference pipelines, orchestration layers, and service boundaries around models * Own production concerns: monitoring, logging, alerting, incident response * Optimize latency and throughput across inference, caching, batching, and streaming Requirements * Strong backend engineering fundamentals in production environments * Experience running high-throughput, low-latency services * Familiarity with AI inference patterns (LLMs, embeddings, multimodal) * Comfortable debugging distributed systems under load * A bias toward shipping and learning from production behavior Tech Stack * Python * Node.js * PyTorch * OpenAI / Anthropic / open-source LLMs * SQL & NoSQL * Kubernetes * Docker What Success Looks Like * Backend systems run reliably at scale, handling production AI

📌 Backend Engineer: AI (Barcelona)
🏢 DNA325
📍 Barcelona