Daniel Leaver
Software Engineer at Neo4j
London, England, United Kingdom
Summary
🤩
Rockstar🎓
Top SchoolDaniel Leaver is a backend software engineer with 11 years' experience building concurrent, event-driven systems and a strong focus on software craftsmanship and functional programming. Currently at Neo4j, he works on the Cypher query language—improving parsing and logical planning—and has contributed to core database components and query cache optimizations in the flagship neo4j project. His background includes moving monoliths to Scala microservices, applying Cats/Cats Effect and Akka in production, and delivering backend services for conversational and clinical products at Babylon. Daniel pairs practical engineering (security fixes, build reliability, performance optimizations) with a curiosity for language-level correctness in compilers and query planners, and started his career combining hands-on product and people management in retail. Based in London, he brings a blend of systems-level thinking and pragmatic delivery informed by substantial open-source contributions to widely used graph database tooling.
11 years of coding experience
9 years of employment as a software developer
Bachelor’s Degree, Computer Games Applications Development, Bachelor’s Degree, Computer Games Applications Development at Abertay University
French, English
Github Skills (17)
stored-procedures10
back-end-development10
databases10
graph-database10
java10
security10
neo4j10
javas10
cypher10
xml-parsing10
database10
testing9
scala9
database-design8
graph-algorithms8
Programming languages (8)
Github contributions (5)
neo4j-contrib/neo4j-apoc-procedures
Apr 2022 - Dec 2022
Awesome Procedures On Cypher for Neo4j - codenamed "apoc" If you like it, please ★ above ⇧
Role in this project:
Back-end Developer
Back-end DeveloperContributions:174 reviews, 56 commits, 98 PRs in 8 months
Contributions summary:Daniel primarily contributed to the `neo4j-apoc-procedures` repository by fixing bugs, improving build processes, and enhancing the security and stability of the procedures. Their work included fixing tests related to schema validation and XML parsing, preventing XXE and "Billion Laughs" vulnerabilities, and addressing build failures. The user also made performance optimizations by avoiding unnecessary calls within the code. Furthermore, they removed test-related functionality and refactored code to remove obsolete code.
neo4j-pluginneo4j-databasestored-proceduresmemgraphapoc
neo4j/neo4j
Mar 2022 - Oct 2022
Graphs for Everyone
Role in this project:Back-end Developer & Database Engineer
Back-end Developer & Database EngineerContributions:34 commits, 33 comments, 1 issue in 7 months
Contributions summary:Daniel primarily contributed to the Neo4j database project by addressing bugs related to string comparison issues within the index hints and AST existential subclause pattern positions. Their work involved modifying Cypher planner components and front-end AST factory code, indicating involvement in the core query processing and parsing functionalities. Additionally, they optimized the fabric query cache, improving its resource efficiency and test coverage.
neo4j-databasedirected-acyclic-graphnosqlgraphsdatabase
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