Full Stack Engineer

Pillar; Barcelona; Hybride; EUR 55 000 - 75 000; Plein temps

Avantages offerts par ce poste

Autonomy

AI-native team

End-to-end ownership

Growth opportunities

Résumé du poste

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.

Responsabilités

• 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.

Connaissances

Backend depth

Full stack

Next.js

TypeScript

React

Supabase

AI-native thinking

Italian

Spanish

English

Outils

Mastra

PostgreSQL

Node/DenO

Description du poste

Pillar was founded in 2025. Today, we are 80+ people, serve 900+ customers, raised €12 million in 2026, and are expanding internationally.

We are building the financial operating system for construction: bringing AI, automation, and modern software to an enormous industry still full of slow, fragmented processes.

We are looking for a product-minded Full Stack Engineer who leans backend, moves fast, and wants to build.

The mission

Build product end to end, with particular strength on backend architecture and execution. Our frontend capability is already strong; we now want someone who can deepen the team on backend while still owning the full product picture.

What you will do

• Own features end to end, from product problem to production.
• Build across our TypeScript codebase using Next.js, React, Supabase, Node/Deno, Postgres, and Mastra.
• Take strong ownership of backend logic, data models, APIs, integrations, and product architecture.
• Work hands-on on the frontend when needed, with a strong preference for engineers comfortable with Next.js.
• Use AI as a native part of your engineering workflow - not only as a feature you build.
• Work in small squads with high autonomy and bottom-up initiatives.
• Move quickly from ambiguity to working product, making pragmatic technical decisions along the way.
• Raise the engineering bar through collaboration, judgment, and execution.

Our stack

• AI: Mastra AI-native workflows

Who we are looking for

Product engineers with backend depth and high agency

• You are a product engineer: you build outcomes, not just code.
• You are stronger on backend or genuinely full stack. Pure frontend profiles are not our priority for this hire.
• You are comfortable with Next.js, React, TypeScript, and modern backend/data patterns. Supabase experience is a strong plus.
• You have worked in a startup or scaleup environment and understand the pace, ambiguity, and ownership it requires.
• You take initiative, get your hands dirty, and get things done without waiting for perfect instructions.
• You are AI-native: AI is already part of how you think, build, debug, learn, and move faster.
• You can zoom out to understand the full picture and zoom in when details matter.
• You learn from failure, communicate openly, and collaborate without ego.
• Native Italian or Spanish is mandatory, together with professional working English.

How we work

• Agile and squad-based: small teams own their domains, with no unnecessary layers.
• AI-first: we build and work in the age of AI.
• Full-stack ownership: engineers are hands-on and accountable for delivered value.
• Bottom-up: initiative is expected, not delegated.

The profile that can succeed

Backend-leaning Product-minded Startup DNA

The sweet spot: a hands-on product engineer from a startup/scaleup journey, ideally around the €3M-€30M growth stage, with backend depth and enough frontend fluency to own features end to end.

Location & languages

Milan or Barcelona; Italian or Spanish proficiency (mandatory) plus professional English.

Hiring process

01: CV screening.

02: 30-min Talent Call - motivation, Pillar knowledge, mindset, languages, and startup fit.

03: Two 30-min Technical Interviews - one backend-focused touchpoint and one frontend/product-focused touchpoint with engineers from the team.

04: Final Interview with our CTO.

What we offer

• Gross salary 55,000-75,000 €
• The opportunity to build core parts of Pillar’s product and engineering foundations as we scale
• End-to-end ownership: from product decisions and architecture to shipping features used by real customers.
• The chance to work in an AI-native engineering team, where AI is part of both the product and the way we build it.
• Close collaboration with Product, AI, and Engineering, with direct exposure to the problems we are solving for customers.
• Real autonomy, responsibility, and room to grow as Pillar and the engineering team scale.