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Principal AI Engineer Handbook
A living reference for engineers building production AI systems
Reference architectures, runnable labs, and interview material — grounded in the same
systems and cross-linked, so a topic reads either from idea to code or from code back
to the reasoning behind it. Sixteen learn modules, eleven labs, seven architecture
deep-dives, every lab passing ruff, mypy --strict, and its
own test suite in CI.
⭐ 92 stars
🍴 27 forks
AstroTypeScriptMDXCI/CD
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TrackFlow
Multi-tenant GPS fleet tracking, built from the wire protocol up
Hand-written GT06, H02, and Teltonika protocol decoders feed a serverless ingest
pipeline, a real-time MapLibre dashboard, and an Expo phone-as-tracker app — with
tenant isolation enforced at the Postgres row level. Load-tested at ~991 packets/sec
with 33ms p95 latency.
Apache-2.0
Load-tested
Next.jsHonoPostgreSQLExpo
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Bounded Agentic Banking Platform
A multi-agent system that asks permission before it acts
A LangGraph planner-executor for handling disputed transactions — every side effect
requires scoped human approval, runs through an idempotent operation ledger, and is
provider-agnostic across OpenAI and Anthropic. Validated across 100 deterministic
scenarios with zero unauthorized tool calls and zero duplicate side effects.
100 scenarios
0 unauthorized calls
LangGraphLangChainFastAPIReact
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Enterprise RAG Reference
A production-shaped RAG stack, built to be read as much as run
Covers the full retrieval-augmented generation lifecycle — ingestion, hybrid retrieval,
guardrails, and evaluation — as reference material for demos, interviews, and
architecture reviews, with provider seams isolated so OpenAI, Anthropic, or local
models can be swapped in without touching domain logic.
FastAPIChromaDBPineconeDocker
⭐
gh-stars-organizer
Turns a chaotic GitHub stars list into a searchable knowledge base
Classifies starred repositories with an LLM, builds embedding-based similarity search,
and organizes them into GitHub Lists — with a terminal UI for one-click workflows and
a local cache so nothing gets processed twice.
⭐ 8 stars
PythonCLIEmbeddingsFAISS
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Watery
A gamified hydration tracker, shipped solo end-to-end
An offline-first Expo app with streaks, achievements, weather-aware daily goals, and
a home-screen widget for one-tap logging — a small, complete consumer product rather
than a reference architecture.
ExpoReact NativeTypeScriptSQLite
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Exotel WhatsApp Reference
A dockerized reference implementation for WhatsApp Business APIs
A REST backend and React admin UI for managing Exotel's WhatsApp Business API —
credential management, templates, onboarding, and webhooks, with queue-based sending
on BullMQ and Redis, and Prometheus metrics built in from the start.
⭐ 5 stars
Node.jsTypeScriptPostgreSQLDocker
🛡️
DPDPA Compliance Skill
An audit-and-remediate toolkit for India's data protection law
An open-source Agent Skill and standalone CLI that scans a codebase against a
52-point checklist for India's Digital Personal Data Protection Act, generates
compliant code for consent management and data rights, and flags the organizational
gaps code alone can't fix.
PythonCLIAgent SkillsCompliance
🎙️
AI Interview Coach
Adaptive interviews that follow up instead of reading a script
An interviewer that changes difficulty, redirects rambling answers, and scores
against six versioned role rubrics instead of a fixed question list — validated
with 156 deterministic evaluation cases and usable without an API key.
Next.jsLangGraphLangChain.jsTypeScript
🌐
Prastuti
Real-time multilingual captions for talks and classrooms
A presenter speaks once; attendees read live translated captions on their own
phones, in their own language. Built serverless-first on Next.js, with a prepaid
usage-credit model instead of subscriptions.
Next.jsTypeScriptAzure SpeechRealtime