Senior Knowledge Graph Engineer

Ecovadis-; Warszawa; Hybrid; PLN 180,000 - 260,000; Full time

Benefits offered by this job

Wellness allowance

Health care

Life insurance

Multisport card

Lunch card

Learning & development

Sustainability events

Employee resource groups

Remote work from abroad policy

Internet and electricity bill support

Volunteer day

Job summary

EcoVadis seeks a hands-on Senior Knowledge Graph Engineer to operationalize ontologies into high-throughput systems powering autonomous AI agents for sustainability challenges. You will bridge unstructured sustainability disclosures with graph databases and drive entity-resolution pipelines.

You will work on GraphRAG ingestion, A-Box instantiation, semantic federation, and deterministic data quality through SHACL, enabling sub-second queries over billions of nodes.

Qualifications

• Degree in Computer Science, Mathematics, Engineering, or a related technical discipline.
• 4+ years of production experience building and querying graph databases (LP Graphs or RDF stores).
• Strong experience with cloud technologies, preferably Azure and its ecosystem.
• Advanced Python for building scalable data pipelines.
• Experience with NLP frameworks for entity extraction and LLM-based structured extraction.

Responsibilities

• Design, implement, and maintain high-throughput GraphRAG ingestion pipelines.
• Build NER, entity linking, and deduplication workflows for canonical graph nodes.
• Integrate internal data with external ontologies and registries (e.g., GLEIF, W3C ontologies).
• Write optimized Cypher and SPARQL queries and support autonomous LLM agents.
• Operationalize SHACL shapes in CI/CD to ensure data quality.

Skills

Knowledge Graph

Graph databases

Python

NLP pipelines

Azure cloud

SHACL validation

Entity resolution

ETL/ELT pipelines

Education

Degree in Computer Science / Mathematics / Engineering

Tools

Neo4j

Memgraph

GraphDB

SPARQL

Job description

Work smart, have fun and make an impact!

EcoVadis is the leading provider of business sustainability ratings. Our solutions are backed by an international team of experts and powerful technology. We analyze data and build sustainability scorecards that give companies actionable insights into their environmental, social and ethical risks.

Why apply to EcoVadis? Be a part of the global sustainability change in business. Grow your career. Work with extraordinary people. Feel valued for your contribution.

We are looking for a hands-on, production-focused Senior Knowledge Graph Engineer to join our growing AI Center of Excellence, responsible for using AI and machine learning to drive innovation across the organization. In this role, you will take the formal domain ontologies designed by our Knowledge Representation Architects and operationalize them into high-throughput, multi-hop systems. We welcome applications from European locations, with the possibility of remote work. Join us!

Your work will directly power autonomous AI agents that solve complex sustainability challenges — including decarbonisation, sustainable procurement compliance, and supply chain resilience. You will bridge the gap between unstructured sustainability disclosures and structured graph databases, building entity-resolution pipelines that make enterprise data agent-ready.

Graph Infrastructure and Ingestion Pipelines

Design, implement, and maintain high-speed GraphRAG ingestion pipelines that transform relational data (ERP, SQL), unstructured ESG reports, and streaming feeds into operational Labeled Property Graphs (Neo4j, Memgraph) and RDF Triple Stores

A-Box Instantiation and Entity Resolution

Build automated Named Entity Recognition (NER), entity linking, and deduplication workflows to resolve mismatched vendor profiles, material SKUs, and facility coordinates into unified canonical graph nodes

Semantic Federation and External Data Integration

Implement automated ETL/ELT pipelines to map and federate internal supply chain data with external, open-source ontologies and registries (such as GLEIF for corporate ownership, W3C SSN/SOSA for IoT sensors, and Copernicus for geo-hazard alerts, PROV-O for data provenance)

GraphRAG and Agent Tooling

Partner with AI/ML Engineers to build low-latency GraphRAG retrieval layers—writing optimized Cypher and SPARQL queries, implementing NL2Query tools for agents, hybrid vector-graph indexing pipelines, and Model Context Protocol (MCP) tool endpoints for autonomous LLM agents

Deterministic Guardrails and Pipeline Validation

Operationalize SHACL (Shapes Constraint Language) shapes into automated data quality tests within CI/CD pipelines to prevent hallucinated or non-compliant data mutations from entering the enterprise knowledge graph

Performance Optimization and GraphOps

Optimize multi-hop query performance, graph partitioning, and database indexing strategies to handle sub-second traversal over billions of nodes and edges

Qualifications

Degree in Computer Science, Mathematics, Engineering, or a related technical discipline

4+ years of production experience building and querying graph databases, specifically Labeled Property Graphs (Neo4j, Memgraph, TigerGraph) or RDF Triple Stores (GraphDB, Stardog, Virtuoso)

Strong experience in cloud technology, preferably Azure and its ecosystem (e.g., Azure Foundry, Azure Bicep, AzureML and Azure Cloud Storage)

Advanced proficiency in Python (RDFLib, NetworkX, PyGraphistry) for building scalable, production-grade data pipelines

Experience building entity extraction pipelines using modern NLP frameworks (LangChain, LlamaIndex, spaCy) or LLM-based structured extraction

Hands-on experience with modern data transformation tools (dbt) and integrating graph databases with vector stores (Qdrant, Pinecone, pgvector) for hybrid search architectures

Solid understanding of semantic web standards (RDF, RDFS and OWL, SKOS, SHACL, RDF-star, SPARQL), graph schema design principles (T-Box vs. A-Box separation), and mapping languages for dealing with heterogeneous data structures (RML, R2RML)

Experience working with domain-specific supply chain, carbon accounting (GHG Protocol), or lifecycle assessment (LCA) data structures is a plus

Direct experience building Model Context Protocol (MCP) servers to expose graph tools to LLM agents is a plus

Experience with enterprise OBDA approaches at-scale is a plus

Additional Information

Offer available only for candidates eligible to work and live in Poland

Location: Hybrid in Warsaw (4 days per month in the office) / Full remote from Poland

In return for your expertise, we offer:

Support with all the necessary office and IT equipment

Wellness allowance for mental and physical wellbeing

Access to professional mental health support

Learning and development

Sustainability events and community involvement

Employee-led resource groups

Optional (fully covered or co-financed) health care and life insurance

Multisport card

Multikafeteria

Lunch card

Remote work from abroad policy

Internet and Electricity bill allowance

Additional day for community service when volunteering

Our team’s strength comes from everyone’s uniqueness and is founded upon mutual respect. EcoVadis commits to equity, inclusion and reducing bias in our hiring processes. EcoVadis does not accept any form of discrimination based on color, national or ethnic origin, ancestry, citizenship, religion, beliefs, age, sex, gender identity, sexual orientation, neurodiversity, disability, parental status, or any other protected characteristic that makes you unique.