Senior Software Engineer (AI Agent Orchestration)

Location: Hybrid in Zaragoza or Barcelona, Spain

Company

hirify.global is a fast-growing deep-tech company developing quantum software and AI products, including CompactifAI and Singularity.

What you will do

• Design, prototype, deploy, evaluate, and operate production-grade AI agent systems.
• Build backend services, APIs, adapters, and connectors integrating language models, enterprise data, external tools, and customer systems.
• Develop agent workflows covering tool use, routing, state management, memory, retrieval, human-in-the-loop steps, and controlled multi-step execution.
• Build RAG, SQL-agent, web-search, reranking, citation, context-management, and evaluation capabilities.
• Improve reliability, observability, latency, scalability, and cost through validation, retries, fallbacks, tracing, caching, concurrency control, streaming, and model selection.
• Collaborate with customers and software, ML, data, DevOps, and product teams while contributing reusable components, technical direction, code reviews, and mentoring.

Requirements

• Master’s degree in Computer Science, Software Engineering, or a related technical field, with relevant practical experience.
• 5+ years of professional Software Engineering experience, including significant experience designing and owning backend or AI/ML systems in production.
• Hands-on experience building and deploying LLM-powered applications or AI agent systems beyond the prototype stage.
• Strong Python proficiency and solid software engineering fundamentals, including modular design, testing, version control, code review, CI/CD, and maintainability.
• Experience designing APIs and integrating external services, tools, databases, and data pipelines into production software.
• Practical understanding of agentic system design, including tool use, structured outputs, workflow orchestration, state management, retrieval, error handling, and fallback strategies.
• Experience evaluating LLM or agent systems and applying results to improve system behaviour.
• Experience with production reliability and observability, including structured logging, tracing, metrics, alerting, and incident analysis.
• Experience deploying and operating services with cloud infrastructure, containers, and production data stores; strong system-design and trade-off analysis skills.
• Ability to own complex work, collaborate across disciplines, and communicate with technical and non-technical stakeholders.
• Fluent written and spoken Spanish and English required.

Nice to have

• Experience with LangGraph, LangChain, or similar agent frameworks and SDKs.
• Experience building end-to-end RAG systems with ingestion, retrieval, vector databases, reranking, grounding, citation, and evaluation.
• Experience with SQL agents, web-search agents, Model Context Protocol integrations, or other tool-using AI systems.
• Experience with FastAPI, PostgreSQL, vector databases, message queues, Docker, Kubernetes, and AWS, Azure, or GCP.
• Familiarity with LLM inference and serving platforms, model routing, structured generation, and model trade-offs.
• Experience turning project-specific implementations into reusable components or shared platform capabilities.
• Experience mentoring engineers and improving engineering quality through code and design reviews.

Culture & Benefits

• Indefinite full-time contract with equal pay, a variable performance bonus, and a signing bonus.
• Hybrid work in Zaragoza or Barcelona with flexible working hours.
• Work visa sponsorship and a relocation package where applicable.
• Private health insurance, flexible remuneration for hospitality and public transportation, and an education budget subject to internal policy.
• Language classes, discounted lunches, career development, and opportunities to learn and teach.
• Inclusive, multicultural, sustainability-focused environment working on cutting-edge technologies.