Senior Semantic Engineer: Ontology & Knowledge Graph Hybrid

Argus Media group; Greater London; Hybrid; GBP 70,000 - 100,000; Full time

Benefits offered by this job

Company bonus scheme

Group pension

Healthcare & life cover

Hybrid work (2 days in office)

Holiday entitlement 25–30 days

Gym membership

Season ticket loan

Cycle to work

Flexible benefits

Training & development

Job summary

Argus is seeking a Senior Semantic specialist to drive discovery, transformation and publication of semantic assets across enterprise data, metadata and external sources, in collaboration with the Ontology Manager. You will help design ontologies, taxonomies, glossaries and knowledge graphs using RDF, OWL, SHACL and Linked Data practices.

The role covers data wrangling, validation, SPARQL and graph operations, entity resolution and metadata governance, with cross‑functional collaboration.

Qualifications

• Experience with ontologies, taxonomies, metadata or knowledge graph solutions.
• Strong understanding of RDF, RDFS, SKOS, OWL, SHACL and Linked Data principles.
• Experience writing and optimising SQL and SPARQL queries.
• Experience using Python for data wrangling, transformation, automation and semantic processing.
• Experience with semantic libraries and frameworks such as RDFLib or similar technologies.
• Strong data analysis, profiling and data quality management skills.
• Experience cleansing, reconciling and transforming complex business datasets.
• Experience working with Git, GitHub and version-controlled asset management.
• Understanding of URI design, namespaces, semantic identifiers and reference data management.
• Strong analytical, problem-solving and investigative capabilities.
• Ability to communicate effectively with both business and technical stakeholders.

Responsibilities

• Semantic Discovery & Data Analysis: profile source systems, inspect schemas and identify semantic concepts and reference data.
• Concept Discovery & Knowledge Extraction: analyse structured, semi-structured and unstructured sources to identify concepts, relationships and classifications.
• Data Wrangling & Semantic Preparation: cleanse, standardise and reconcile terminology and reference data from multiple sources.
• Semantic Asset Delivery & Knowledge Graph Enablement: develop RDF/OWL/Turtle/JSON-LD representations and create mappings.
• SPARQL & Graph Operations: develop, test and optimise SPARQL queries and manage graph platforms.
• Entity Resolution & Identifier Management: implement URI minting and manage entity matching.
• Semantic Validation & Quality Assurance: develop SHACL rules and perform validation and QA.
• Metadata & Semantic Operations: publish and synchronise assets within metadata platforms; contribute to lineage.

Skills

Ontologies

Taxonomies

Knowledge graph

Metadata

RDF

RDFS

SKOS

OWL

SHACL

SQL

SPARQL

Python

RDFLib

Data analysis

Cleansing

Git

GitHub

URI design

Stakeholder comms

Analytical thinking

Communication

Tools

RDFLib

Job description

Argus is seeking a Senior Semantic specialist to drive discovery, transformation and publication of semantic assets across enterprise data, metadata and external sources, in collaboration with the Ontology Manager. You will help design ontologies, taxonomies, glossaries and knowledge graphs using RDF, OWL, SHACL and Linked Data practices.

The role covers data wrangling, validation, SPARQL and graph operations, entity resolution and metadata governance, with cross‑functional collaboration.