Experteer Overview

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As a Staff Software Engineer at Factorial, you will lead technical initiatives around AI-native features, shipping production-ready capabilities built with LLM APIs. You’ll work closely with Product and Design, writing Rails and React to shape scalable systems that real customers rely on. This role emphasizes end-to-end ownership, mentorship, and driving architectural decisions in a fast-growing, product-driven environment. You’ll help define how AI features are designed, tested, and operated at scale, balancing reliability and compliance.

Compensaciones / Ventajas
• Lead important technical initiatives and set architectural direction for meaningful roadmap areas
• Collaborate very closely with Product and Design from early conversations to implementation
• Own systems end-to-end from problem framing to production rollout and maintenance
• Engage with customers to gather feedback and inform product decisions




• Shape AI features at scale, including design, build, and operation of AI-native experiences
• Promote spec-driven development with clear success criteria and constraints
• Build reusable, scalable, and secure components used by multiple product domains
• Develop modular, traceable AI skills and governance tooling for reliability
• Contribute to a culture of high engineering standards, mentoring, and process improvement
• Maintain data reliability by combining LLM outputs with deterministic sources of truth
• Raise the engineering bar across hiring, practices, and collaboration

Responsabilidades
• Solid depth in both backend and frontend software engineering
• Experience shipping real production products, not just prototypes
• Strong understanding of APIs, cloud platforms (AWS, Azure, or GCP), and system xghoner design
• Experience integrating LLM APIs into product features and shipping to real us

📌 Staff Software Engineer (Barcelona)
🏢 Factorial Hr
📍 Barcelona