Knowledge Engineer (Knowledge Graphs)

Location: Cologne, Germany

Company

hirify.global delivers digital transformation projects and tailored consulting solutions for the life sciences industry.

What you will do

• Design and build enterprise ontologies, entity hierarchies, relationship types, inference rules, and knowledge graphs.
• Translate business definitions and data models into machine-readable representations using RDF, OWL, and related standards.
• Work with subject matter experts to capture domain knowledge, business logic, ontologies, and taxonomies.
• Maintain clear boundaries between ontologies, semantic data models, and knowledge graphs in collaboration with data modelers and semantic engineers.
• Align knowledge assets with semantic web standards and governance guidelines.
• Enable conversational analytics, AI agents, and cross-domain reasoning through reusable and scalable knowledge structures.

Requirements

• 3–5 years of experience in engineering, semantic modeling, or information and knowledge management.
• Hands-on experience with ontology and taxonomy modeling, enterprise ontologies, and knowledge graphs.
• Proficiency in RDF, OWL, SKOS, graph databases, knowledge graph platforms such as Stardog or AWS Neptune, and SPARQL.
• Ability to work with subject matter experts and convert business definitions into machine-readable structures.
• Strong communication, problem-solving, stakeholder management, ownership, and accountability skills.
• Strong spoken and written English is required.

Nice to have

• Experience with Stardog, AWS Neptune, or similar knowledge graph platforms.
• Knowledge of regulatory requirements, data governance practices, and industry trends.

Culture & Benefits

• Collaborative, flat-structured environment with cross-functional teamwork and global colleagues.
• Annual training budget, regular workshops, and professional development opportunities.
• Support with visas, permits, and international assignments.
• Benefits and perks tailored to the country of residence.
• Competitive salary and benefits package, plus an employee referral program.

Hiring process

• Submit a CV followed by a profile review by Talent Acquisition.
• Attend an introductory call and a technical interview.
• Some roles may include a client interview before final feedback.