https://asadullahkhan.me/blog Hands-on articles on RAG, real-time voice AI and FastAPI backends by Asadullah Khan. en Wed, 14 Oct 2026 00:00:00 GMT https://asadullahkhan.me/blog/hire-voice-ai-engineer-pakistan https://asadullahkhan.me/blog/hire-voice-ai-engineer-pakistan Wed, 14 Oct 2026 00:00:00 GMT A practical guide to hiring a voice AI engineer in Pakistan: the skills that matter, the questions to ask, red flags and how to run a low-risk pilot, by Asadullah Khan. Voice AI, Hiring, Pakistan, Consulting https://asadullahkhan.me/blog/pgvector-postgresql-vector-search https://asadullahkhan.me/blog/pgvector-postgresql-vector-search Tue, 13 Oct 2026 00:00:00 GMT How to run production vector search in PostgreSQL with pgvector: schemas, HNSW indexes, cosine distance, metadata filtering and hybrid search, by Asadullah Khan. pgvector, PostgreSQL, RAG, Vector Search, Python https://asadullahkhan.me/blog/fastapi-microservices-ai-applications https://asadullahkhan.me/blog/fastapi-microservices-ai-applications Mon, 12 Oct 2026 00:00:00 GMT How to structure FastAPI microservices for AI products: async endpoints, background tasks, dependency injection, health checks and observability, by Asadullah Khan. FastAPI, Python, Microservices, AsyncIO, DevOps https://asadullahkhan.me/blog/ai-calling-platform-python-livekit https://asadullahkhan.me/blog/ai-calling-platform-python-livekit Sat, 10 Oct 2026 00:00:00 GMT How to build an AI calling platform: SIP trunking, LiveKit SIP, a Python agent worker, call state, recordings and the compliance rules that matter, by Asadullah Khan. Voice AI, LiveKit, SIP, Telephony, Python https://asadullahkhan.me/blog/realtime-voice-ai-livekit-fastapi https://asadullahkhan.me/blog/realtime-voice-ai-livekit-fastapi Mon, 05 Oct 2026 00:00:00 GMT How to architect a low-latency voice AI agent: WebRTC transport with LiveKit, streaming speech-to-text and text-to-speech, turn detection, and a FastAPI backend, by Asadullah Khan. Voice AI, LiveKit, WebRTC, FastAPI, STT/TTS https://asadullahkhan.me/blog/rag-chatbot-langchain-python https://asadullahkhan.me/blog/rag-chatbot-langchain-python Mon, 28 Sep 2026 00:00:00 GMT A practical, end-to-end guide to building a retrieval-augmented generation (RAG) chatbot in Python with LangChain, a vector store and FastAPI, by Asadullah Khan. RAG, LangChain, FastAPI, Python, LLMs