Lead Graph DB Engineer

Hitachi Digital LLC; Birmingham; On-site; GBP 70,000 - GBP 90,000; Full time

Job summary

A leading tech company in Birmingham is seeking a Lead Graph Database Developer with extensive expertise in Neo4j and graph technologies. The role involves designing and optimizing graph-based data models, integrating knowledge graphs with AI systems, and enhancing performance for enterprise applications. Ideal candidates will have a background in Computer Science and significant experience in database development. This position offers an opportunity to make a notable impact in digital transformation efforts.

Qualifications

• 7+ years in database development, 3+ years specializing in Neo4j and graph technologies.
• Strong proficiency in Neo4j and API integration.
• Familiarity with AI/ML integration and RAG pipelines.

Responsibilities

• Design and implement graph schemas and knowledge graphs using Neo4j.
• Integrate knowledge graphs with AI/ML models for semantic search.
• Optimize graph queries and indexing for large-scale datasets.

Skills

Neo4j

GraphQL

AI/ML integration

Data modeling

Problem-solving

Education

Bachelor’s or Master’s in Computer Science, Data Engineering

Tools

Cypher

ETL tools

Job description

We’re Hitachi Digital, a company at the forefront of digital transformation and the fastest growing division of Hitachi Group. We’re crucial to the company’s strategy and ambition to become a premier global player in the massive and fast-moving digital transformation market.

Our group companies, including GlobalLogic, Hitachi Digital Services, Hitachi Vantara and more, offer comprehensive services that span the entire digital lifecycle, from initial idea to full-scale operation and the infrastructure to run it on. Hitachi Digital represents One Hitachi, integrating domain knowledge and digital capabilities, and harnessing the power of the entire portfolio of services, technologies, and partnerships, to accelerate synergy creation and make real-world impact for our customers and society as a whole.

Imagine the sheer breadth of talent it takes to unleash a digital future. We don’t expect you to ‘fit’ every requirement – your life experience, character, perspective, and passion for achieving great things in the world are equally as important to us.

About Us

Hitachi Digital is transforming enterprise data ecosystems through advanced AI and graph technologies. We build intelligent, connected platforms that power decision-making across global OpCos. We are seeking a Lead Graph Database Developer with deep expertise in Neo4j, Knowledge Graph design, and AI-driven graph analytics to architect and implement next-generation graph solutions.

Role Overview

As a Lead Graph DB Developer, you will design, develop, and optimize graph-based data models and knowledge graphs that integrate seamlessly with AI systems. You will lead the implementation of Neo4j-based solutions, enabling advanced reasoning, semantic search, and contextual intelligence for enterprise applications.

• Design and implement graph schemas, data models, and knowledge graphs using Neo4j.
• Develop Cypher queries, stored procedures, and graph algorithms for complex data relationships.
• Architect graph ingestion pipelines for structured, semi-structured, and unstructured data sources.

AI & Knowledge Graph Integration

• Integrate knowledge graphs with AI/ML models for semantic search, entity resolution, and reasoning.
• Implement Graph + LLM patterns for contextual retrieval and RAG (Retrieval-Augmented Generation).
• Collaborate with AI teams to enable agentic workflows leveraging graph-based context.

Performance & Optimization

• Optimize graph queries and indexing for large-scale datasets.
• Ensure high availability, scalability, and security of graph databases in production environments.

Governance & Documentation

• Define best practices for graph modeling, data lineage, and metadata management.
• Document architecture decisions, query patterns, and integration workflows.

Required Qualifications

• Bachelor’s or Master’s in Computer Science, Data Engineering, or related field.
• 7+ years in database development; 3+ years specializing in Neo4j and graph technologies.
• Strong proficiency in Neo4j, GraphQL, and API integration.
• Experience with Knowledge Graph design, ontology modeling, and semantic technologies.
• Familiarity with AI/ML integration, LLMs, and RAG pipelines.
• Solid understanding of data modeling, ETL pipelines, and distributed systems.

Preferred Qualifications

• Experience with cloud platforms (GCP preferred; AWS/Azure a plus).
• Knowledge of graph algorithms (PageRank, community detection, shortest path).
• Exposure to LangChain, vector databases, and embedding strategies.
• Certifications in Neo4j or Graph Data Science.
• Strong analytical and problem-solving skills.
• Ability to design scalable, secure, and performant graph solutions.
• Collaborative mindset with excellent communication skills.
• Passion for graph-driven AI and semantic data architectures.

Success Metrics

• Delivery of enterprise knowledge graph integrated with AI systems.
• Performance optimization of graph queries for large-scale datasets.
• Positive impact on search relevance, contextual reasoning, and data connectivity.

What You’ll Work With

• Graph DB: Neo4j, Cypher, APOC procedures.
• Data & BI: ETL tools, APIs, semantic modeling.

We’re proud to say we’re an equal opportunity employer and welcome all applicants for employment without attention to race, colour, religion, sex, sexual orientation, gender identity, national origin, veteran, age, disability status or any other protected characteristic. Should you need reasonable accommodations during the recruitment process, please let us know so that we can do our best to set you up for success.