Experteer Overview 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 APIsResponsabilidades - Solid depth in both backend and frontend software engineering - Experience shipping real products to production - Understanding of APIs, cloud platforms (AWS, Azure, or 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,

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