Role: Systems Engineer

Build developer tooling for semantic diffing and code search. Ship fast search across codebases and diffs, a diff engine that understands syntax trees and symbols, and workflows including 'rebase a review.' Help invent new diffing primitives, recognize refactors and code movement, and advance the version-control model itself.

Responsibilities

• -Design and implement fast, accurate full-text and vector search over diffs and codebases; build embedding and indexing pipelines and benchmark retrieval quality, latency, and cost
• -Evaluate and integrate vector stores (e.g., TurboPuffer, S3 Vectors, pgvector, Chroma) or build bespoke indexers optimized for code and diffs
• -Build a semantic diff engine that understands syntax trees, symbols, and refactors; detect renames and code movement across files, functions, and modules
• -Design algorithms to recognize equivalence under renaming, indentation, and structural transformations; enable change grouping and conflict visualization
• -Deliver low-latency, high-throughput indexing and retrieval at massive-repo scale; define SLOs, instrument, and continuously benchmark
• -Prototype and productionize workflows like "rebase a review" and multi-VCS support (Git, Jujutsu), including deep integrations with code hosts

Qualifications

• -Expertise in Rust, C, or Zig and systems programming, with strong understanding of performance, concurrency, and correctness
• -Experience with ASTs/parsers (e.g., tree-sitter), program analysis, or compiler/tooling internals
• -Hands-on background in search and retrieval systems: embeddings, vector indexes, ranking, or RAG
• -Understanding of version-control internals (Git DAGs, merge/rebase strategies); exposure to alternative VCS (e.g., Jujutsu) is a plus
• -Experience building scalable indexing pipelines and services, with strong observability and benchmarking discipline