Senior AI Engineer: Production LLMs for HR & Payroll

Valeria HR; Barcelona; Híbrido; EUR 40.000 - 45.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Equity

Free lunch

Remote work flexibility

Unlimited vacation

Descripción de la vacante

Valeria HR, Barcelona-based AI-native HR and payroll platform, seeks an experienced software engineer to design and ship AI features end-to-end. You will build production-grade agents, architect multi-agent systems, and own context engineering, evals, and tooling to support compliant payroll processes.

You will collaborate with product, design and business teams in a fast-paced startup environment. The role emphasizes reliability, observability, and the ability to move quickly while maintaining

Formación

• 3+ years of professional software engineering experience building production systems.
• Strong Python skills and solid backend fundamentals (APIs, SQL, Git, testing).
• Hands-on experience with LLMs / agents in production: LangChain/LangGraph, RAG, prompting, tool-calling, or equivalents.
• Context engineering and evaluation mindset: you reason about why models behave and validate with evals.
• Ability to design and break down medium-complexity solutions autonomously, communicating progress and trade-offs clearly.

Responsabilidades

• Prototype the complex: build proofs of concept that solve hard problems, then take them to production.
• Translate business into AI: understand the business problem and land it into a technical solution.
• Design agents end-to-end: multi-agent architectures, tools, memory, orchestration, and state management.
• Master context engineering: decide what goes into the context window and how.
• Build the LLM harness: tool interfaces, output parsing, retries, fallbacks, guardrails, scaffolding, flow control.
• Ensure reliability: evals and observability before every release, not just happy-path.
• Build high-quality RAG systems: embeddings, vector stores, retrieval, grounding in compliance-heavy context.
• Pick the right model: integrate GPT, Gemini, Claude with cost, latency, and window considerations.
• Integrate systems: MCP servers and external system integrations.
• Ship production code: Python, APIs, tests, CI/CD, and best practices.

Conocimientos

3+ years exp

Python

APIs

SQL

Git

LLMs in prod

Context engineering

Eval mindset

Autonomous design

Startup mindset

Communication

Fluent EN/ES

Herramientas

LangChain

LangGraph

Datadog

Azure OpenAI

Vertex AI

Descripción del empleo

Valeria HR, Barcelona-based AI-native HR and payroll platform, seeks an experienced software engineer to design and ship AI features end-to-end. You will build production-grade agents, architect multi-agent systems, and own context engineering, evals, and tooling to support compliant payroll processes.

You will collaborate with product, design and business teams in a fast-paced startup environment. The role emphasizes reliability, observability, and the ability to move quickly while maintaining