Today, we are 80+ people, serve 900+ customers, raised €12 million in ****, 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 MissionBuild 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.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.Our stackProduct: Next.js · React · TypeScriptBackend & data: Supabase · Node/Deno · PostgresAI: Mastra · AI-native workflowsWho You AreA Product engineer with backend depth and high agencyYou 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.

You have worked in a startup or scaleup environment and understand the pace, ambiguity, and ownership it requires.You can zoom out to understand the full picture and zoom in when details matter.Native Italian or Spanish is mandatory, together with professional working English.The Profile that Will SucceedBackend-leaning · Product-minded · Startup DNAThe 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.Full-stack ownership: engineers are hands-on and accountable for delivered value.The chance to work in an AI-native engineering team, where AI is part of both the product and the way we build it.native Italian or Spanish (mandatory) plus professional English.Two 30-min Technical Interviews - one backend-focused touchpoint and one frontend/product-focused touchpoint with engineers from the team.

📌 Programador Fullstack Backend O Frontend (Barcelona)
🏢 Pillar
📍 Barcelona