Data Specialist - Knowledge Graphs

About Cala AI

From 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.

About the role

We’re looking for a Data Specialist focused on Knowledge Graphs to join our growing 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 do

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

What we’re looking for

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 PLGs)

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

Why join Cala AI?

Work alongside a founder with a proven track record in AI startups

Join a company dedicated to building AI for good - focused on trust and impact

Competitive compensation package plus stock options & flexible benefits covering transport, meals, and health insurance.

Based in Cloudworks, a dynamic co-working space near Passeig de Gràcia in Barcelona; enjoy the perks that come from being part of Cloudworks, like gym subscription and restaurant discounts

A supportive, inclusive, and horizontal culture that values authenticity and growth

Hiring Process (Conversation-Based)

Technical conversation with team member around candidate's experience

System design interview with CTO (onsite preferred)

Cultural fit chat with CEO

Offer

We welcome applicants from diverse backgrounds who bring passion, curiosity, and resilience. If this sounds like you, get in touch — we’re excited to see what we can build together.