We re looking for a Data Specialist focused on Knowledge Graphs to join our client team. You ll work at the intersection of big data, semantics, and AI, helping architect and scale our graph-based data infrastructure.Your role will focus on designing and maintaining data systems that power our knowledge graph platform - including RDF graphs, ontologies, and semantic validation/querying pipelines. You ll contribute to a deeply technical mission: representing and verifying information in a structured, trustworthy way.What you ll doDesign, build, and maintain scalable graph-based data pipelines (batch and streaming)Model and manage Knowledge Graphs at scaleExplore and work with graph databases such as Neo4j, JanusGraph, or Amazon NeptuneCollaborate closely with the Data and AI teams on data modeling, storage, and transformationPromote a culture of clean, reliable, and meaningful data engineeringWhat we re looking for2+ years of hands-on experience with Knowledge Graphs or Semantic Web technologiesBackground in Data Engineering or Data Science (engineering preferred)Experience with Knowledge Graph technologies (no matter if RDF based or PLGs)Proficiency with general data engineering toolsFamiliarity with AWS Neptune or similar managed graph solutions is a plusCurious, collaborative, and excited to tackle a specialized, high-impact challengeWhy join Cala AI?Work alongside a founder with a proven track record in AI startupsJoin a company dedicated to building AI for good - focused on trust and impactCompetitive compensation package plus stock optionsBased in Cloudworks, a dynamic co-working space near Passeig de Gr cia in Barcelona enjoy the perks that come from being part of Cloudworks, like gym subscription and restaurant discountsA supportive, inclusive, and horizontal culture that values authenticity and growthETL, Neo4J, Python,