D L Narayana

Profile

Computer-science student building production-shaped systems: real-time CDC lakehouses and PySpark warehouses with explicit schemas, data-quality gates and idempotent, tested transforms; full-stack products on Next.js, TypeScript and PostgreSQL; and AI features — LangGraph agents with human-in-the-loop safety gates, hybrid RAG, and on-device ONNX/WASM inference. 17 public repositories, 14 live deployments.

Selected projects

1. LakeFlow — Data engineering

   Sep 2026 · github.com/D-L-Narayana/lakeflow-cdc-pipeline

   Real-time CDC lakehouse: Postgres → Debezium → Kafka → Spark → Bronze/Silver/Gold.

   • 510,663 CDC events replayed
   • 29.5 s end-to-end to Gold (2 vCPU)
   • ~17.3K/s events per second
   • 5,239 rows quarantined with reasons

   PySpark · Structured Streaming · Kafka · Debezium · PostgreSQL · Parquet · Airflow · Docker Compose · pytest

2. Retail Lakehouse ETL — Data engineering

   Sep 2026 · github.com/D-L-Narayana/retail-lakehouse-etl

   Schema-enforced PySpark batch warehouse over a million defective sales lines.

   • 1,009,989 raw sales lines read
   • 50.9 s end-to-end (~19.8K rows/s)
   • 9,993 duplicates removed
   • 1.30 % quarantined, per-rule breakdown

   PySpark · Spark SQL · Parquet · MongoDB · Airflow · pytest · Python 3.12

3. AeroSentry — AI & computer vision

   Sep 2026 · github.com/D-L-Narayana/aerosentry-agents

   Multi-agent AI operations layer for autonomous drone fleets, with a human in the loop.

   • 3 + 1 specialist agents + supervisor
   • 17 offline tests in CI
   • HITL approval gate on every high-risk action
   • p50 / p95 latency tracked in golden-set evals

   Python · LangGraph · Pydantic · FastAPI · Hybrid RAG (BM25 + dense, RRF) · SQLite · Docker · GitHub Actions

4. VeriLens — AI & computer vision

   Jul 2026 · github.com/D-L-Narayana/verilens

   On-device KYC: face match, passive liveness, OCR and tamper forensics — 100 % in the browser.

   • −66 % model payload (16.6 → 5.6 MB)
   • 0.85 / −0.01 genuine vs impostor cosine
   • 0.998 vs 0.06 live vs replay liveness probability
   • ~48 ms three models on 2 vCPUs

   ONNX Runtime Web · WASM · Tesseract 5 · Python (quantisation + eval) · Vanilla JS · Playwright

5. StayNest — Full-stack product

   Jun 2026 · github.com/D-L-Narayana/staynest

   Full-stack Airbnb-style marketplace with a working booking flow and host analytics.

   • 16 stays across 8 categories
   • 100+ reviews driving computed ratings
   • 1,200+ Q&A pairs in the built-in assistant
   • 32 commits

   Next.js · TypeScript · Supabase (Postgres + Auth) · Tailwind CSS · Motion · OpenStreetMap

6. CityHelp — Full-stack product

   Jun 2026 · github.com/D-L-Narayana/cityhelp

   Civic platform: report city issues, upvote, and track fixes on a live dashboard and map.

   • Realtime Supabase-powered dashboard + map
   • 7-day trends, category mix, department load
   • 18+ wards tracked in the demo dataset

   Next.js · TypeScript · Supabase Realtime · PostgreSQL · Recharts · API Routes