Topic fingerprint
Memory allocators / kernel
Who he is
Arun Sharma is a senior systems engineer turned founder. He spent time at Facebook maintaining the Linux kernel tree (jemalloc/MADV patches, c. 2011–2013) and contributed to Google-wide profiling infrastructure. He's now building LadybugDB — an open-source embedded columnar graph database forked from KuzuDB, with a focus on Cypher queries over Parquet/DuckDB storage.
He's active on HN as an operator-founder: commenting with first-hand war stories, linking his own GitHub discussions and blog posts, and occasionally sparring with people who disagree with him about graph DBs or jemalloc patches.
Technical thesis (recurring in comments)
"LLMs are themselves a graph database with probabilistic edge traversal. Some apps want it to be deterministic."
"Vector + keyword search gets you 70–80% on evals. Graph handles the last 20–30%."
"Transformers are GNNs which won the hardware lottery."
"Write static Python, transpile to Rust/PyO3. Use a GC'd intermediate language until you have millions of users."
"Rewriting a complex working piece of software in Rust is not trivial — an incremental path is better."
Personality & commenting style
drops own GitHub links often
cites Anthropic & Google research
argues with ex-colleagues publicly
thin-skinned about downvotes
strong opinions, lightly hedged
10+ year idea incubation cycles
He publicly noted a "consistent pattern of downvoting" and linked an X post about it rather than adjusting his tone. He also acknowledged openly: "Guilty as charged of carrying ideas in my head for 10+ years and acting on them later."
Projects & links found in comments
LadybugDB — github.com/LadybugDB/ladybug — embedded graph DB (Cypher + Parquet/DuckDB)
pgembed — fork of pgserver (pglite) with vector + BM25 extensions
py2many / v-ast — Python AST → multi-language transpiler (V-lang backend)
mcp-server-ladybug — MCP server wrapping LadybugDB for GraphRAG
adsharma.github.io — personal blog (perf hints, DuckDB wikidata compression)
blog.ladybugmem.ai — longer-form LadybugDB writing
Most active thread
Grafeo – A fast, lean, embeddable graph database built in Rust (March 2026)
~20 comments in a single thread, positioning LadybugDB against Grafeo, defending graph DB legitimacy, debating CSR-on-disk vs WCOJ, and defending his choice not to rewrite in Rust. Classic founder mode: every reply is both a technical argument and a sales pitch.
generated from hn.algolia.com/api/v1 · adsharma · march 2026