Software Engineer - Core Database; Kernel

Software Engineer - Core Database (Kernel)

London

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 its 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  and follow us on Linked In.

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.

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 an experienced backend engineer who is able to solve technical challenges and deliver high-quality code to join our talented, innovative Kernel team. You will be part of a brilliant, energetic, and fun team of engineers working on the development of the storage engines, transaction handling, indexes, data import and page cache in order to build the core of the graph database!

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

• Build and ship new features for the core of the leading graph database
• Write high-quality, testable, and efficient code
• Promote new ideas, take an active part in features discussions and roadmap prioritisation
• 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
• “Do what you want weeks” to work on your own product enhancements and integrations

• You have experience designing multi-threaded systems and algorithms
• You have a deep understanding of system design, data structures, and algorithms
• You are proficient in Java or a C-style programming language
• You have strong troubleshooting skills
• You have knowledge about performance profiling and optimisation
• You have experience with leading and delivering development projects
• 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 humour!

• Database management systems
• Deep JVM experience
• Experience with large codebases

#LI-Hybrid

Neo4j is, without question, the most popular graph database in the world. We have customers in every industry globally, and our products are a proven product/market fit. Joining our team is an opportunity to shape the future of data and analytics. Below are just a few exciting facts about Neo4j.

• Raised the biggest funding round in database history ($325M Series F). Backed by world-class investors like Eurazeo, GV (formerly Google Ventures), and Inovia Capital, Neo4j has raised over $600M in funding and is currently valued at over $2Bn. This puts Neo4j among the most well‑funded database companies in history.
• Co‑founder…