Software Engineer - Knowledge Graphs

About the Position

Software Engineer - Knowledge Graphs

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We are looking for a Data Specialist focused on Knowledge Graphs to join our growing team at Cala. 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.

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About Cala

AI is about to do a real share of the world's work. Whether we can trust it comes down to one thing: what it knows.

Cala is building the knowledge layer for that future. We're turning everything publicly known about the world (every company, person, filing and regulation, and every connection between them) into a single graph of verified facts that any agent can query. What Bloomberg and LexisNexis became for human professionals, Cala is becoming for AI: built with agents, for agents, at a scale no team of people could ever reach.

We raised a €7M pre-seed led by Lightspeed, launched in June, and global enterprises already run on Cala in production. We're based in Barcelona and San Francisco, and still small enough that everyone who joins now helps define what Cala becomes.

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Responsibilities

• Design, build, and maintain scalable graph-based data pipelines (batch and streaming)
• Model and manage Knowledge Graphs at scale
• Explore and work with graph databases such as Neo4j, JanusGraph, or Amazon Neptune
• Collaborate closely with the Data and AI teams on data modeling, storage, and transformation
• Promote a culture of clean, reliable, and meaningful data engineering

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Requirements

• 2+ years of hands-on experience with Knowledge Graphs or Semantic Web technologies
• Background in Data Engineering or Data Science (engineering preferred)
• Experience with Knowledge Graph technologies (no matter if RDF based or LPGs)
• Proficiency with general data engineering tools
• Familiarity with AWS Neptune or similar managed graph solutions is a plus
• Curious, collaborative, and excited to tackle a specialized, high-impact challenge

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Why Cala?

• Work alongside founders with a proven track record in AI and startups
• Build foundational AI systems with an "AI for good" focus
• High ownership, high autonomy, real technical challenges
• Join at an early stage and help shape both technology and culture
• A supportive, inclusive, and horizontal team environment

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Locations

• Barcelona, Spain
• San Francisco, United States

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By submitting this application, I agree that my personal data will be collected, processed, and retained by the company solely for the purposes of managing and assessing my candidacy.