Engineering Journal

TECHNICAL NOTES

In-depth engineering notes on deterministic data quality, hybrid RAG retrieval architectures, and physical constraint scheduling. Grounded directly in shipped repositories.

Mar 12, 2026·6 min read

Engineered for VitalTrace

Deterministic Validation in Clinical AI: Why LLMs Need Biological Plausibility Gates & LOINC Standardization

Why relying solely on LLM JSON output for health records invites catastrophic silent errors, and how we engineered a deterministic clinical validator using physiological plausibility limits, canonical LOINC mapping, and PostgreSQL security-invoker views.

Data QualityHealthcare AITypeScriptZodVitalTrace

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Feb 18, 2026·8 min read

Engineered for DocMind AI

Hybrid RAG in Practice: Combining Dense Vector Search with Sparse BM25 via Reciprocal Rank Fusion

An engineering breakdown of why pure semantic vector search fails on technical queries, and how combining FAISS cosine embeddings with BM25 inverted lexical indexing using Reciprocal Rank Fusion (RRF) eliminates retrieval blind spots.

Information RetrievalFAISSBM25FastAPIDocMind AI

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Jan 25, 2026·7 min read

Engineered for WorkWise

Beyond Crude Clock Rules: Liljegren WBGT Modeling and Deterministic Constraints in Indian Construction

Why arbitrary 12:00–15:00 work bans fail outdoor construction crews during Indian summer heatwaves, and how deterministic Liljegren (2008) Wet-Bulb Globe Temperature calculations provide defensible task allocation.

Climate TechConstraint SchedulingPythonWorkWise

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