Backend-First Full Stack Engineer — AI-Native & End-to-End Ownership

Pillar; Barcelona; Hybrid; EUR 55,000 - 75,000; Full time

Benefits offered by this job

Autonomy

AI-native team

End-to-end ownership

Growth opportunities

Job summary

Pillar is building a financial operating system for construction, combining AI, automation and modern software. We are seeking a product-minded Full Stack Engineer with backend depth to own features end to end, primarily focusing on backend while maintaining full product ownership.

Location options include Milan or Barcelona, with a strong emphasis on Italian or Spanish language proficiency and professional English.

Qualifications

• Product-minded engineer with backend depth.
• Experience with Next.js, React, TypeScript and modern backend patterns.
• Startup/scaleup experience with ownership mindset.
• Fluency in Italian or Spanish and professional English.

Responsibilities

• Own features end to end from problem to production.
• Build backend and data models, APIs, integrations, and architecture.
• Collaborate in small squads with autonomy and ownership.
• Contribute on frontend when needed, with Next.js focus.

Skills

Backend depth

Full stack

Next.js

TypeScript

React

Supabase

AI-native thinking

Italian

Spanish

English

Tools

Mastra

PostgreSQL

Node/DenO

Job description

Pillar is building a financial operating system for construction, combining AI, automation and modern software. We are seeking a product-minded Full Stack Engineer with backend depth to own features end to end, primarily focusing on backend while maintaining full product ownership.

Location options include Milan or Barcelona, with a strong emphasis on Italian or Spanish language proficiency and professional English.