Software Engineer - Vector Index

London Area, United Kingdom

6/11/2025

About Neo4j

Neo4j is the leader in Graph Database & Analytics, helping organizations uncover hidden patterns and relationships across billions of data connections deeply, easily, and quickly. Customers use Neo4j to gain a deeper understanding of their business and reveal new ways of solving their most pressing problems. Over 84% of Fortune 100 companies use Neo4j, along with a vibrant community of 250,000+ developers, data scientists, and architects across the globe.

At Neo4j, we’re proud to build the technology that powers breakthrough solutions for our customers. These solutions have helped NASA get to Mars two years earlier, broke the Panama Papers for the ICIJ, and are helping Transport for London to cut congestion by 10% and save $750M a year. Some of our other notable customers include Intuit, Lockheed Martin, Novartis, UBS, and Walmart.

Neo4j experienced rapid growth this year as organizations looking to deploy generative AI (GenAI) recognized graph databases as essential for improving it’s accuracy, transparency, and explainability. Growth was further fueled by enterprise demand for Neo4j’s cloud offering and partnerships with leading cloud hyperscalers and ecosystem leaders. Learn more at neo4j.com and follow us on LinkedIn.

Our Vision

At Neo4j, we have always strived to help the world make sense of data.

As business, society and knowledge become increasingly connected, our technology promotes innovation by helping organizations to find and understand data relationships. We created, drive and lead the graph database category, and we’re disrupting how organizations leverage their data to innovate and stay competitive.

The Role

Do you like to solve advanced and complex computer science problems? Do you want to be part of a team that values user success and where you can have intellectually honest discussions?

We are looking for a backend engineer with a special interest in database indexes and algorithm development who likes to solve technical challenges and deliver high-quality code to join our Kernel team. You will be part of a brilliant, energetic, and fun team of engineers working on building the core of the graph database!

You will be part of an international team based in Malmö, Sweden, and London, UK.

What You Will Do

• Build and ship features related especially to index for the leading graph database
• Design and optimize the indexing subsystem to support complex graph queries and a variety of workloads
• Evolve vector search capabilities to support graph + vector use cases
• Work together with our product managers to help set the roadmap for the work in the index area going forward
• Write high-quality, testable, and efficient code
• Work with real-world scale and performance challenges
• Promote new ideas, take an active part in features discussions, and roadmap prioritization
• Integrate research and technologies into the database core - the team regularly reads research papers to see if there are some new ideas to incorporate into the product
• Work closely with our customers and collaborate with other teams
• “Do what you want days” to work on your own product enhancements and integrations
  
  

You'll Thrive In This Role If

• You have an interest in how indexes in databases work
• You are proficient in algorithm development in general.
• You are proficient in Java or a C-style programming language
• You are humble. Being able to discuss ideas and challenge each other to build better solutions together
• You have good communication skills and a sense of humor!
  
  

You may also have experience and interest in the following:

• Multi-threaded systems
• Performance profiling and optimization
• Database management systems
• Deep JVM experience
• Large codebases