August 25, 20267 min readJaykumar Kanjia

Architecting Production AI Agent Workflows with FastAPI, Next.js, and LLMs

A comprehensive guide to building resilient, streaming AI agent systems with FastAPI asynchronous workers, structured schema validation, pgvector semantic search, and real-time frontend updates in Next.js.

FastAPI

AI Agents

Python

Next.js

Autonomous AI Agents in Production

Building reliable AI agents requires moving beyond single-shot prompt completions to multi-step orchestration with function calling, validation loops, and persistent conversational memory.

Asynchronous Architecture with FastAPI & Celery

Long-running LLM evaluation tasks are queued asynchronously, allowing web clients to receive instant job tokens and stream live updates over WebSockets or Server-Sent Events (SSE).

Written by

Jaykumar Kanjia

Sr. Software Engineer specializing in scalable backend architectures, high-performance Redis caching, and autonomous AI agent workflows.