Experteer Overview
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As a Staff Software Engineer at Factorial, you will shape AI-native features from end to end, collaborating closely with Product, Design, and Engineering to ship production-ready capabilities. You’ll work with Rails and React, designing scalable systems and guiding technical direction for meaningful roadmap areas. You’ll lead cross-functional initiatives to build reusable AI components and reliable, compliant product experiences. This role offers impact across a fast-growing, mission-driven company building with LLM APIs and agentic workflows.
Compensaciones / Incentivos
• Set technical direction for meaningful roadmap chunks and make architecture decisions
• Collaborate tightly with Product and Design from the earliest planning stages
• Own end-to-end systems from problem to production rollout and long-term maintenance
• Engage with customers to capture real problems and feed context back into solutions
• Define how to build AI features at scale, ensuring reliability and compliance
• Promote spec-driven development with clear success criteria and edge-case handling
• Create reusable components and abstractions usable by other teams




• Design and evolve modular AI skills that automate workflows and ensure safe actions
• Build monitoring and quality tooling (automatic and human-in-the-loop)
• Ground AI outputs in trusted data sources, balancing flexibility and determinism
• Raise engineering culture through mentoring and better practices
• Avoid roles focused on model training or fine-tuning as this is product engineering with LLM APIs
Responsabilidades
• Solid depth in both backend and frontend software engineering
• Experience shipping real products to production
• Understanding of APIs, cloud platforms (AWS, Azure, or xqbhyrx GCP), and system design
• Experience integrating LLM APIs into product features and shipping to users
• Proven leadership and ability to influence technical direction and culture
• Ability to advocate for effective processes, hiring, and deployment practices
• Experience building scalable, secure, and governable components
• Clear English communication; Spanish a plus
Requisitos principales
• Alan private health insurance
• Wellhub fitness benefits
• Cobee expense management
• Language classes
• Breakfast in the office and organic fruit
• Pet friendly workplace

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