Cala is looking for a Backend Engineer with 4+ years of experience to build the systems behind AI-driven information verification at scaleThe team behind Vilynx, a Barcelona AI startup that Apple acquired, founded Cala. They’re building a verified knowledge graph for AI agents, and they’re looking for someone who is strong in backend work (Python, APIs, distributed systems) and also enjoys working on data, infrastructure and applied AI.Hybrid in Barcelona (3 days/week at their new office on Gran Via)Competitive salary + stock optionsPerks: adaptable benefits for transport, meals and health insurance, plus a hiring process built on conversations with no coding testsIt’s a good opportunity for someone who likes owning systems end to end and wants to join an early-stage AI company.About Cala AIFrom the creators of Vilynx - a Barcelona AI startup acquired by Apple - comes Cala AI: a bold new venture redefining how information is verified and represented at massive scale. Based in Barcelona’s vibrant tech hub near Passeig de Gràcia,



Cala AI is building innovative AI systems focused on trust, accuracy, and impactful technology that challenges industry norms.Recently, Cala AI was named by Creandum to their #EuroSeed50 list - highlighting the most promising early-stage startups in Europe - an honor that reflects the strong belief in our mission and team. We are a small, ambitious group dedicated to building real solutions with grit, heart, and a culture of authenticity.We are now growing our engineering team with an experienced Backend Engineer who enjoys working across boundaries - backend, data, infrastructure, and applied AI.About the roleWe’re looking for an experienced backend engineer with depth.You’ll come from a Backend Engineering background - Python, APIs, distributed systems - but what matters most is your motivation to build across layers and solve complex problems end-to-end. Backend is your anchor, but this is a high-impact engineering position for someone who

📌 Backend Engineer (Barcelona)
🏢 JobFluent
📍 Barcelona