Senior AI Engineer (LLM)

TL;DR

Senior AI Engineer (LLM): Leading the design, evaluation, and deployment of production-grade generative AI systems with an accent on LLM-powered applications and evaluation strategies. Focus on building automated eval pipelines, resolving complex failure modes, and ensuring system reliability and scalability in production.

Location: Must be based in Spain (Barcelona office available for hybrid work).

Company

hirify.global is a fast-growing scale-up company leading the vacation rental industry, empowering property owners and managers worldwide through technology.

What you will do

• Lead the design and development of LLM-powered applications including chatbots, copilots, and agents.
• Own the LLM evaluation strategy, including designing gold-standard datasets and automated scoring systems.
• Diagnose and resolve complex failure modes such as hallucinations and retrieval issues.
• Optimize systems for latency, cost, scalability, and reliability in production.
• Set standards for responsible AI, including safety, bias mitigation, and observability.
• Mentor junior engineers and guide best practices in LLM development.

Requirements

• 5+ years of experience in software engineering, machine learning, and applied AI.
• Strong software engineering fundamentals and proficiency in Python.
• Proven track record of taking LLM-powered features from concept to long-term production maintenance.
• Experience with prompt engineering, RAG architectures, and automated testing for non-deterministic systems.
• Solid experience using SQL and data analytics to inform product decisions.
• English proficiency required (all applications must be submitted in English).

Nice to have

• Deep expertise in model fine-tuning and adversarial red-teaming.
• Experience designing robust, production-grade evaluation at scale using statistical validation.

Culture & Benefits

• Flexible remote work policy.
• 25 working days of paid vacation plus Jornada Intensiva in August.
• Comprehensive Cigna health insurance including dental and psychological support.
• Monthly meal allowance and flexible remuneration plan.
• Home-office setup allowance.
• Free Spanish classes and a dynamic international work environment.