Navas Herbert

Data Engineer & AI Builder who learns in public. ETL, data modeling, FastAPI, RAG - I write about what I'm building as I build it, mistakes included

Joined on May 16, 2026

Navas Herbert

Aug 20

Nested if statements

2 min read

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Navas Herbert

Aug 6

SQL CTEs: Writing Queries Like You're Telling a Story

10 min read

Navas Herbert

Jul 27

I Built a SaaS to Prove a FastAPI Router Change Most People Missed

#python #api #fastapi #webdev

6 min read

Navas Herbert

Jul 22

SQL Subqueries: A Query Inside a Query (And Why That's Powerful)

#ai #sql #postgres #beginners

8 min read

Navas Herbert

Jul 21

SQL Date & Time: From Today's Date to Birthday Reminders in 12 Questions

#sql #postgres #beginners #ai

8 min read

Navas Herbert

Jul 20

SQL Functions: Cleaning Text and Rounding Numbers the Right Way

#sql #postgres #ai #beginners

8 min read

Navas Herbert

Jul 18

SQL CASE WHEN: Teaching Your Queries to Think

#sql #postgressql #beginners #requestforpost

7 min read

Navas Herbert

Jul 13

SQL Filtering: The Five Operators That Let You Ask Smarter Questions

#sql #postgres #beginners #development

7 min read

Navas Herbert

Jul 12

SQL Week: We Deleted Products, Dropped Tables, and Found Out Which Supplier Was Sitting on the Most Stock

#sql #postgres #beginners #ai

7 min read

Navas Herbert

Jul 5

FastAPI Just Got Its Own Deployment Platform - And It's One Command

#ai #fastapi #devops #python

3 min read

Navas Herbert

Jul 2

Not all chunking is equal.

#ai #beginners #rag #webdev

1 min read

Navas Herbert

Jul 1

Day 2 of 3: We Added an LLM and the Project Became a Real Product

#ai #python #fastapi #rag

6 min read

Navas Herbert

Jun 30

Day 1 of 3: We Built the Retrieval Half of RAG - Before Touching a Single AI Model

#python #ai #fastapi #beginners

11 min read

Navas Herbert

Jun 29

I Taught Git the Right Way - Branch, PR, Tag the Issue, Merge

#git #github #beginners #tutorial

7 min read

Navas Herbert

Jun 27

𝙷̲𝚊̲𝚕̲𝚕̲𝚞̲𝚌̲𝚒̲𝚗̲𝚊̲𝚝̲𝚒̲𝚘̲𝚗̲ ̲𝚖̲𝚒̲𝚝̲𝚒̲𝚐̲𝚊̲𝚝̲𝚒̲𝚘̲𝚗̲

1 min read

Navas Herbert

Jun 25

We Built a Real API Live in Class - Here's How the Grade Tracker Session Went

#python #ai #fastapi #beginners

9 min read

Navas Herbert

Jun 20

Build Your First RAG System From Scratch - No Frameworks, Just Python

#python #ai #machinelearning #beginners

9 min read

Navas Herbert

Jun 19

Building a REST API with FastAPI from Scratch - Full CRUD, SQLite, Middleware & CORS

#fastapi #python #webdev #beginners

11 min read

Navas Herbert

Jun 18

I Built an AI Document Intelligence API to Demo to My Internship Students - Here's the Full Story

8 min read

Navas Herbert

Jun 9

Today I Taught Linux File Permissions - And Alice Couldn't Read the Salary File

#linux #devops #beginners #ai

6 min read

Navas Herbert

Jun 9

Python Week 6: Our Programs Finally Read Real Files

#python #beginners #dataengineering #ai

8 min read

Navas Herbert

Jun 7

Python Week 5: One Variable, Many Values (Data Structures!)

#python #beginners #programming #opensource

8 min read

Navas Herbert

Jun 7

Python Week 4: We Taught Python to Remember Things (Functions!)

#python #beginners #development #programming

8 min read

Navas Herbert

May 25

Python Week 2: We Taught Python to Make Decisions

#ai #programming #python #learning

6 min read

Navas Herbert

May 25

Python Week 3: We Stopped Repeating Ourselves (Loops!)

#python #beginners #development #programming

7 min read

Navas Herbert

May 19

We Switched From SQL to Python - Here's How Week 1 Went

#python #beginners #development #programming

6 min read

Navas Herbert

May 16

I Taught SQL to Complete Beginners: Here's What Actually Happened

#sql #postgres #beginners #teaching

5 min read

Navas Herbert

May 16

Making Africa Energy Data Accessible to LLMs - a Practical Guide

#mcp #africa #energy #python

3 min read

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Navas Herbert

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Nested if statements

Want to connect with Navas Herbert?

SQL CTEs: Writing Queries Like You're Telling a Story

I Built a SaaS to Prove a FastAPI Router Change Most People Missed

SQL Subqueries: A Query Inside a Query (And Why That's Powerful)

SQL Date & Time: From Today's Date to Birthday Reminders in 12 Questions

SQL Functions: Cleaning Text and Rounding Numbers the Right Way

SQL CASE WHEN: Teaching Your Queries to Think

SQL Filtering: The Five Operators That Let You Ask Smarter Questions

SQL Week: We Deleted Products, Dropped Tables, and Found Out Which Supplier Was Sitting on the Most Stock

FastAPI Just Got Its Own Deployment Platform - And It's One Command

Not all chunking is equal.

Day 2 of 3: We Added an LLM and the Project Became a Real Product

Day 1 of 3: We Built the Retrieval Half of RAG - Before Touching a Single AI Model

I Taught Git the Right Way - Branch, PR, Tag the Issue, Merge

𝙷̲𝚊̲𝚕̲𝚕̲𝚞̲𝚌̲𝚒̲𝚗̲𝚊̲𝚝̲𝚒̲𝚘̲𝚗̲ ̲𝚖̲𝚒̲𝚝̲𝚒̲𝚐̲𝚊̲𝚝̲𝚒̲𝚘̲𝚗̲

We Built a Real API Live in Class - Here's How the Grade Tracker Session Went

Build Your First RAG System From Scratch - No Frameworks, Just Python

Building a REST API with FastAPI from Scratch - Full CRUD, SQLite, Middleware & CORS

I Built an AI Document Intelligence API to Demo to My Internship Students - Here's the Full Story

Today I Taught Linux File Permissions - And Alice Couldn't Read the Salary File

Python Week 6: Our Programs Finally Read Real Files

Python Week 5: One Variable, Many Values (Data Structures!)

Python Week 4: We Taught Python to Remember Things (Functions!)

Python Week 2: We Taught Python to Make Decisions

Python Week 3: We Stopped Repeating Ourselves (Loops!)

We Switched From SQL to Python - Here's How Week 1 Went

I Taught SQL to Complete Beginners: Here's What Actually Happened

Making Africa Energy Data Accessible to LLMs - a Practical Guide