Senior Mobile Developer

September 15, 2026

Hybrid

Senior

Barcelona, Spain, Madrid, Spain

Important before applying

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English is required

Description

Factorial is building the leading business management software for companies across Europe, centralizing HR, finance, and workflows for 700K+ users. They are looking for a Senior Mobile Developer (React Native) to join the mobile engineering team and deliver smooth, AI-powered experiences. The role emphasizes product-first thinking, ownership, and a strong AI-first approach to software development within a fast-growing multicultural company.

Responsibilities

Work as part of mobile engineering team to deliver smooth app experiences
Ideate, craft, and deploy user interactions and experiences for customers
Actively participate in team objectives definition with customer focus
Contribute to continuous improvement of technology, infrastructure, and architecture
Take ownership of and accountability for team success
Mentor teammates by sharing experience and engineering expertise
Participate in code reviews and knowledge sharing across the team

Requirements

Experience building real AI-powered systems or workflows, not just experiments
React Native with deep understanding of its internals and architecture
Proven track record of shipped projects with measurable impact
Product-first thinking — designing complete end-to-end experiences
Speed and adaptability to experiment, learn, and iterate fast
Ability to break down complex problems into shareable abstractions
Customer-centric mindset understanding real user needs
Comfortable communicating in English
Bonus: experience with LLMs, skill-based agents, MCP, or other AI protocols

Conditions

Office-first in Barcelona and Madrid with 20% remote flexibility
Private health insurance through Alan
Wellhub membership for gyms, pools, and outdoor classes
Cobee for expense savings
Language classes provided
Breakfast in office and organic fruit
Pet-friendly workplace
Multicultural environment with 40+ nationalities
Buddy system from first day of employment

React NativeAI/LLMsaas

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