About Valeria
Valeria is building the future of HR and payroll in Spain. We're an AI-native platform that automates contracts, payroll, and compliance for companies with high employee turnover (hospitality, delivery, events, agriculture). We're rethinking how an entire industry works—moving from manual, error-prone processes to intelligent automation.
We're a fast-growing startup backed by top investors, disrupting a €5B+ industry that's still stuck in spreadsheets and legacy software.

Your Role

You'll work closely with the AI Lead, designing product AI features and transforming internal processes with AI—helping build a cross-functional AI team with impact across every department. You'll be a core member of our AI team, building the agents that power Valeria in production—talking to real customers and handling real payroll and legal processes. You'll own AI features end-to-end: designing agent architectures, engineering context, building evals that hold up, and shipping reliable systems into a domain where correctness genuinely matters.
- Prototype the complex:



build proofs of concept that solve hard problems in innovative ways, then take them to production
- Translate business into AI: understand the business problem deeply and land it into a solid technical solution
- Design agents end-to-end: multi-agent architectures, tools, tool-calling, function calling, memory, orchestration, and state management
- Master context engineering: decide what goes into the context window and how (system prompts, few-shot, retrieval, memory, compaction, token management), understanding *why* behavior changes and anticipating failure modes (hallucinations, edge cases, prompt injection)
- Build the LLM harness: the layer around the model—tool interfaces, output parsing and validation, retries, fallbacks, guardrails, scaffolding, and flow control—that turns a model into a reliable production agent
- Ensure reliability: solid evals and observability (datasets, metrics, regressions,

📌 Mid AI Engineer (Barcelona)
🏢 ValeriaHR
📍 Barcelona