Senior Data Engineer: Ontologies & Knowledge Graphs (Hybrid)

Valarian Technologies; Greater London; Hybrid; GBP 80,000 - 110,000; Full time

Benefits offered by this job

Equity

Competitive salary

Employer pension contributions

Private health insurance

Hybrid work setup

Gym memberships

Rewarding company retreats

Job summary

Valarian Technologies is hiring to design and build data foundations enabling ACRA applications and Valarie to understand organisational information. You will transform heterogeneous sources into coherent entities, relationships and queryable data products across graph, relational and NoSQL databases.

You'll work with product teams to define ontologies, build ingestion pipelines, implement entity resolution, and design data models with provenance and lineage considerations.

Qualifications

• Strong production Python engineering experience with tested ingestion/transformation pipelines.
• Proficient SQL including modelling, transactions, indexing and optimization.
• Hands-on experience with NoSQL and document/Key-Value modelling.
• Production experience with a graph database or triple store (e.g., Neo4j/Cypher or RDF/SPARQL).
• Ontology design with clear entity definitions, stable identifiers and versioning.

Responsibilities

• Define and evolve ontologies for organisational entities, relationships and business rules.
• Build ingestion/transformation pipelines from APIs, databases and files into canonical data models.
• Implement entity resolution, deduplication, and source reconciliation with provenance.
• Design/maintain graphs, relational schemas and NoSQL structures for efficient querying.
• Develop efficient queries/interfaces for applications and AI tools with traceability.

Skills

Python

Ingestion pipelines

ETL pipelines

SQL

NoSQL

Graph databases

Ontology design

Entity resolution

Domain knowledge

Data modeling

Tools

Neo4j

Cypher

SPARQL

RDF stores

Document/Key-value stores

Job description

Valarian Technologies is hiring to design and build data foundations enabling ACRA applications and Valarie to understand organisational information. You will transform heterogeneous sources into coherent entities, relationships and queryable data products across graph, relational and NoSQL databases.

You'll work with product teams to define ontologies, build ingestion pipelines, implement entity resolution, and design data models with provenance and lineage considerations.