Full Stack Engineer

[Based in Milan or Barcelona Office]

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.

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

• Product: Next.js · React · TypeScript

• Backend & data : Supabase · Node/Deno · Postgres

• 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; native Italian or Spanish (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: Practical Challenge - a Supabase-based exercise in an environment candidates can access.

05: 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.