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Avnish Yadav

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Engineering Notes

Practical guides for AI, automation, and product engineering.

Field notes from systems I build: agents, n8n workflows, developer tools, micro-SaaS, and production architecture.

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AI AgentsUnmasking the Black Box: Mastering LangChain Callbacks for Debugging

Avnish Yadav – February 22, 2026 · 8 MIN READ

Unmasking the Black Box: Mastering LangChain Callbacks for Debugging

Master LangChain callbacks to debug AI agents. Learn to build custom handlers, trace execution flows, and fix 'black box' LLM issues.

AI AutomationStop Parsing Strings: How to Enforce Structured JSON Outputs in AI Agents

Avnish Yadav – February 22, 2026 · 6 MIN READ

Stop Parsing Strings: How to Enforce Structured JSON Outputs in AI Agents

Tired of your automation pipelines crashing because an LLM decided to add a 'Here is the code' preamble? Here is how to use Pydantic, function calling, and schema injection to force deterministic JSON responses every time.

AI AgentsLangChain vs. Custom Code: When to Build Your Own LLM Orchestration Layer

Avnish Yadav – February 22, 2026 · 9 MIN READ

LangChain vs. Custom Code: When to Build Your Own LLM Orchestration Layer

Every developer building with LLMs faces the 'build vs. framework' dilemma. I wasted weeks on custom orchestration before switching. Here's my honest breakdown of when LangChain saves you time and when it's overkill.

EngineeringBeyond Einstein: Building a Custom AI Sales Agent in Salesforce

Avnish Yadav – February 21, 2026 · 7 MIN READ

Beyond Einstein: Building a Custom AI Sales Agent in Salesforce

Salesforce's native AI is powerful, but expensive. Here is a technical blueprint for building your own Opportunity Enrichment Agent using Apex, Flow, and external LLMs to automate pre-meeting research.

AI AutomationCreate Your First AI Planning Agent in 10 Minutes (n8n Tutorial)

Avnish Yadav – February 14, 2026 · 8 MIN READ

Create Your First AI Planning Agent in 10 Minutes (n8n Tutorial)

Build a functional AI planning agent that breaks down complex goals into actionable steps using n8n. This step-by-step tutorial includes exact prompts, workflow configuration, and a ready-to-use template.

AI AutomationBuilding AI Agents from Scratch: A Practical Guide

Avnish Yadav – January 20, 2026 · 8 MIN READ

Building AI Agents from Scratch: A Practical Guide

Learn to build AI agents from scratch with LangChain, OpenAI, and custom tools. Practical guide integrating n8n, Google Sheets, and DeepSeek for real-world automation.