Senior Software Engineer - RDF Infrastructure

4+ years of professional software development experience

A degree in Computer Science, Engineering, Mathematics, a related field, or equivalent practical experience

Hands-on experience developing database or graph database internals, rather than solely building applications on top of databases

Experience developing RDF triplestore, labeled property graph, or closely related graph database infrastructure

Strong understanding of several areas of database implementation, such as:

Storage engines, indexing, and physical data representation

Query planning, optimization, and execution

Transactions, concurrency, and isolation

Cardinality estimation and database statistics

Caching, memory management, and disk I/O

Replication, recovery, or high-availability architecture

Strong software engineering skills in Java or another systems-oriented programming language

Deep experience with Eclipse RDF4J, Apache Jena, or another RDF triplestore implementation

Experience with labeled property graph database internals or graph query engines

Experience implementing or optimizing SPARQL, Cypher, Gremlin, or other graph query languages

Experience with RDF or graph storage layouts and indexing strategies

Experience contributing to or modifying open-source database engines

Experience with LMDB, RocksDB, or other embedded key-value or storage engines

Knowledge of RDF, SPARQL, SHACL, inference, and Semantic Web standards

Experience diagnosing database performance at large scale, including memory, I/O, query planning, and storage bottlenecks