Spencer Presley · Software engineer

AI and backend systems that hold up outside the demo.

I build evidence-grounded agents, local-first inference, retrieval systems, and the backend infrastructure that keeps them reliable.

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Selected work

Public CrunchAtlas marketing view showing a network security campaign summary

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Current work · 2025–

CrunchAtlas / AtlasCyber

I build the AI and backend infrastructure behind AtlasCyber: evidence-grounded agents, governed local inference, durable work orchestration, and isolated execution across cloud, on-prem, and air-gapped environments.

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022026 · Retrieval systems

Local retrieval engine

gloss

A hybrid search engine that returns a source document's actual passages—with citations—instead of generating a paraphrase.

Artifact: One portable SQLite database
Retrieval: BM25 + local vectors + RRF
Evaluation: 266 rank-sensitive cases

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032025 · Concurrency

Systems debugging

Celery Fork-Safety Investigation

A reproducible investigation of one pre-fork initialization bug that deadlocks on Linux and crashes on macOS.

Linux: Permanent futex wait
macOS: libdispatch SIGTRAP
Root cause: Forked synchronization state

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