Experteer Overview As a Staff Software Engineer at Factorial, you will lead technical initiatives and work closely with Product and Design to ship AI-native features in production.

You'll build with Rails and React, design scalable systems, and drive adoption of new abstractions across teams.

You'll shape the architecture for AI-enabled product experiences, ensuring reliability, compliance, and real customer impact.

This role offers ownership from problem framing to production rollout and long-term maintenance.

Compensaciones / Ventajas • Set technical direction for meaningful roadmap areas and own architecture decisions • Collaborate continuously with Product and Design from earliest conversations • Own end-to-end systems from problem framing to production rollout and maintenance • Gather customer context to inform technical choices and AI feature design • Define how AI features scale, design, run, and maintain them at Factorial • Promote spec-driven development with clear success criteria and constraints • Build reusable, scalable components across product domains • Develop modular AI 'skills' that automate real workflows with safe,



traceable actions • Create monitoring and quality tooling (automatic and human-in-the-loop) for trustworthy AI features • Ground AI outputs with deterministic data sources balancing accuracy and compliance • Mentor peers, contribute to hiring, and push for best engineering practices • Lead key technical decisions that shape engineering culture across the company Responsabilidades • Solid depth in both backend and frontend software engineering • Experience shipping real production products (not just prototypes) • Strong understanding of APIs, cloud platforms, and system design • Experience integrating LLM APIs into product features for real users • Proven technical and cultural leadership with high standards • Ability to influence processes and drive adoption of abstractions • Track record of delivering measurable impact in work or side projects • Experience communicating in English; Spanish is a plus Requisitos principales • ESOP plan • Private health insurance • Wellhub for wellness benefits • Cobee expense management • Language classes • Office perks like breakfast and fruit

📌 Staff Software Engineer (Backend) (La Coruña)
🏢 Factorial Hr
📍 La Coruña