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# Staff Software Engineer

- **Company:** Factorial Hr
- **Location:** Barcelona, Spain
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Artificial Intelligence, Amazon Web Services, Microsoft Azure, ReactJS, Large Language Models, Backend, Front End Software Development
- **Published:** September 28, 2026
- **Apply:** https://www.buscojobs.com.es/staff-software-engineer-en-barcelona-ID-372443142

## About the Role

Requisitos principalesSolid depth in both backend and frontend software engineeringExperience shipping real products to productionUnderstanding of APIs, cloud platforms (AWS, Azure, or GCP), and system designExperience integrating LLM APIs into product features and shipping to usersProven leadership and ability to influence technical direction and cultureAbility to advocate for effective processes, hiring, and deployment practicesExperience building scalable, secure, and governable componentsClear English communication; Spanish a plusleadershipcross-functional collaborationclear communicationRuby on RailsReactAPIs and system design

## Description

OverviewAs 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 / BeneficiosAlan private health insuranceWellhub fitness benefitsCobee expense managementLanguage classesBreakfast in the office and organic fruitPet friendly workplaceResponsabilidadesSet technical direction for meaningful roadmap chunks and make architecture decisionsCollaborate tightly with Product and Design from the earliest planning stagesOwn end-to-end systems from problem to production rollout and long-term maintenanceEngage with customers to capture real problems and feed context back into solutionsDefine how to build AI features at scale, ensuring reliability and compliancePromote spec-driven development with clear success criteria and edge-case handlingCreate reusable components and abstractions usable by other teamsDesign and evolve modular AI skills that automate workflows and ensure safe actionsBuild monitoring and quality tooling (automatic and human-in-the-loop)Ground AI outputs in trusted data sources, balancing flexibility and determinismRaise engineering culture through mentoring and better practicesAvoid roles focused on model training or fine-tuning as this is product engineering with LLM APIsRequisitos principalesSolid depth in both backend and frontend software engineeringExperience shipping real products to productionUnderstanding of APIs, cloud platforms (AWS, Azure, or GCP), and system designExperience integrating LLM APIs into product features and shipping to usersProven leadership and ability to influence technical direction and cultureAbility to advocate for effective processes, hiring, and deployment practicesExperience building scalable, secure, and governable componentsClear English communication; Spanish a plusleadershipcross-functional collaborationclear communicationRuby on RailsReactAPIs and system design


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