Senior Semantic Architect: Ontologies & Graphs

Argus Media; Greater London; Hybrid; GBP 70,000 - 110,000; Full time

Benefits offered by this job

Competitive salary and company bonus

Group pension scheme

Group healthcare and life assurance

Hybrid working environment

25 days annual holiday

Gym membership

Season ticket travel loan

Cycle to work scheme

Flexible benefits platform

Training and development

Job summary

Argus Media is seeking a Senior Semantic role to support enterprise semantic and ontology functions. You will work with the Ontology Manager to discover, analyse, transform, validate and publish semantic assets derived from enterprise data and external sources.

Responsibilities include semantic modelling, SPARQL and graph operations, entity mapping, and governance-focused validation. Collaboration with business and technical teams is essential.

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 and identify semantic opportunities.
• Concept Discovery & Knowledge Extraction: analyse sources to identify concepts and relationships.
• Data Wrangling & Semantic Preparation: cleanse and reconcile terminology and classifications.
• Semantic Asset Delivery & Knowledge Graph Enablement: develop RDF/OWL/JSON-LD representations and mappings.
• SPARQL & Graph Operations: develop and optimise SPARQL queries for knowledge graphs.
• Entity Resolution & Identifier Management: manage URIs and concept reconciliation.
• Semantic Validation & Quality Assurance: create SHACL rules and perform quality checks.
• Metadata & Semantic Operations: publish assets within governance platforms and maintain lineage.
• Semantic Asset Lifecycle Management: manage repositories with GitHub and CI/CD for semantic assets.
• Stakeholder Collaboration: work with domain experts to clarify terminology and classifications.

Skills

Ontologies & vocabularies

RDF/OWL/SKOS

SPARQL & SQL

Python for data wrangling

Git/GitHub

Knowledge graph platforms

Data quality & profiling

URI design & identifiers

Stakeholder communication

Tools

PoolParty

TopBraid EDG

Semaphore

OpenMetadata

DataHub

Apache Atlas

RDFLib

Job description

Argus Media is seeking a Senior Semantic role to support enterprise semantic and ontology functions. You will work with the Ontology Manager to discover, analyse, transform, validate and publish semantic assets derived from enterprise data and external sources.

Responsibilities include semantic modelling, SPARQL and graph operations, entity mapping, and governance-focused validation. Collaboration with business and technical teams is essential.