Simon Grätzer
Senior Software Engineer at Stardog
Cologne, North Rhine-Westphalia, Germany
Summary
🤩
Rockstar🎓
Top SchoolSimon Grätzer is a senior software engineer with 14 years of experience building and optimizing database systems, currently focused on SPARQL/RDF query engines and optimizers at Stardog. He brings deep C++ and Java expertise from work on storage engines and RocksDB-based backends, plus production experience at MongoDB on sharding and cluster balancing. An active open-source contributor, Simon has contributed bug fixes and core fixes to high-profile projects like ArangoDB and RocksDB, demonstrating comfort with low-level storage, transactions and replication. He pairs engineering rigor with customer-facing skills—having provided support, training and conference talks—so he navigates both deep technical problems and practical adoption challenges. Notably, his track record spans multi-model and graph databases, giving him uncommon cross-cutting insight into query execution, storage internals and scaling tradeoffs.
14 years of coding experience
1 year of employment as a software developer
Master of Science - MS, Informatik, Master of Science - MS, Informatik at RWTH Aachen University
Stackoverflow
286reputation
6kreached
7answers
0questions
Github Skills (22)
storage-engine10
c-language10
databases10
cprogramming-language10
database10
transaction9
sql-database9
relational-databases9
authentication8
user-authentication8
debug8
error-handling8
debugging8
testing7
http7
Programming languages (11)
Github contributions (5)
arangodb/arangodb
Oct 2016 - Nov 2020
🥑 ArangoDB is a native multi-model database with flexible data models for documents, graphs, and key-values. Build high performance applications using a convenient SQL-like query language or JavaScript extensions.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:94 reviews, 1379 commits, 520 PRs in 4 years 2 months
Contributions summary:Simon primarily focused on debugging and fixing existing code, including handling deprecated features and correcting internal operations. Additionally, the user made changes to system code related to authentication and database features. These changes are specific to the ArangoDB codebase.
data-modelsdatabase-modelextensionsjavascriptquery-language
facebook/rocksdb
Oct 2018 - Jun 2019
A library that provides an embeddable, persistent key-value store for fast storage.
Role in this project:Database Engineer / Database Administrator
Database Engineer / Database AdministratorContributions:5 commits, 5 PRs, 8 comments in 8 months
Contributions summary:Simon primarily contributed to bug fixes and improvements within the RocksDB database system. Their work included addressing issues related to incorrect handling in WriteBatch iteration, printf formatting errors, and implementing transaction-related updates. The user also modified the transaction log iterator and introduced a fix by updating the status to `TryAgain`, showcasing familiarity with the core functionalities of the database engine.
persistent-storagebigtablefast-storagelsm-treedatabase
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