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. #J-18808-Ljbffr