TechnoApple Blogs
Practical guides, tutorials, and insights on cloud, full-stack development, and everything in between.
Most Recent
All posts →Build Your First Power BI Report: Step-by-Step with a Real Dataset
2026/04/27·12 min readA hands-on walkthrough for building a complete Power BI report from scratch using a retail sales dataset covering 2023–2025. Covers data loading, Power Query transformations, DAX measures, and building interactive visualizations.
How to Get Started with Power BI
2026/04/26·7 min readPower BI is Microsoft's enterprise-grade business intelligence platform. This guide covers how to get started with Power BI Desktop, connect data sources, and build your first report.
C# Code Organization and Documentation Without Noise — Clean Code
2026/04/26·8 min readOrganize C# projects and classes for maintainability, and write comments that explain why instead of what.
Modern C# Features That Improve Code Readability — Clean Code
2026/04/21·10 min readUse modern C# features like records, pattern matching, collection expressions, and primary constructors without sacrificing maintainability.
C# Testing and Testability for Maintainable Systems — Clean Code
2026/04/14·9 min readWrite cleaner C# code by designing for testability and focusing tests on behavior using AAA and descriptive naming.
C# Code Smells and Refactoring Patterns That Matter — Clean Code
2026/04/09·11 min readIdentify common C# code smells and apply practical refactoring patterns to improve readability, safety, and maintainability.
Front-End
View all →How to Fix 502 and 503 Gateway Errors on AWS EC2 with an Application Load Balancer
2026/02/14·12 min readA deep-dive into why 502 and 503 errors appear on a Node.js app hosted on AWS EC2 behind an ALB, what causes them, and how to fix them properly with an Auto Scaling Group and a robust bootstrap script.
Get Start with Web Worker
2024/03/09·1 min readHow to get start with Web Worker
How to Test GCP Function Locally with Node.js
2023/06/01·1 min readThis blog shows how to test GCP Cloud Function locally with Node.js.
Deploy GCP Cloud Function with Event Trigger via PubSub
2023/04/06·2 min readThis blog shows how to create a simple Node.js app and deploy it to GCP Cloud Functions as a Pub/Sub event trigger.
Deploy GCP Cloud Function with Http Trigger
2023/04/06·1 min readThis blog shows how to create a simple Node.js app and deploy it to GCP Cloud Functions as an HTTP trigger.
How to Publish NPM Package to npmjs.com
2023/02/05·1 min readA practical release checklist for publishing a scoped npm package with validation, versioning, and verification steps.
Back-End
View all →How to Send MongoDB Logs to CloudWatch Logs
2021/03/05·1 min readThis blog shows how to send MongoDB log files to AWS CloudWatch Logs. You can send multiple logs to AWS CloudWatch Logs by defining the awslogs.conf file.
How to Setup MongoDB on Windows
2021/02/03·4 min readThis blog shows how to set up MongoDB 4.4 Community version on Windows 10 as a local development environment, create a simple database, table, and collection, and how to backup and restore data by using mongoexport and mongoimport.
How to Use C# Enum Flag
2020/12/11·1 min readA quick code snippet showing how to use C# enum flags with the power of two for defining combinable flag values.
How to Find Record from MongoDB with Node.js and Mongoose
2020/09/11·2 min readThis blog shows a tutorial on how to find data from MongoDB by using Node.js with Mongoose.
How to Delete Data from MongoDB with Node.js and Mongoose
2020/08/11·2 min readThis blog shows a tutorial on how to delete data from MongoDB by using Node.js with Mongoose.
How to Update MongoDB Data with Node.js and Mongoose
2020/08/11·2 min readThis tutorial shows how to update data in MongoDB by using Node.js with Mongoose, including connecting to MongoDB, defining a schema, and performing update operations.
Cloud
View all →How to Fix 502 and 503 Gateway Errors on AWS EC2 with an Application Load Balancer
2026/02/14·12 min readA deep-dive into why 502 and 503 errors appear on a Node.js app hosted on AWS EC2 behind an ALB, what causes them, and how to fix them properly with an Auto Scaling Group and a robust bootstrap script.
How to Create AWS EC2 by Terraform
2023/02/03·10 min readThis blog demonstrates how to set up a production-ready AWS infrastructure with EC2, ALB, Route 53, and HTTPS using Terraform.
How to Setup Node.JS Web Server to AWS with ECS and Fargate
2022/10/11·6 min readThis blog will focus on how to create a simple Node.js app using Docker, then push the Docker image to AWS ECR and ECS and use AWS Fargate to serve this Node.js web server.
How to Setup Node.JS Web Server to AWS with ECS
2022/10/11·6 min readThis blog will focus on how to create a simple Node.js app using Docker, then push the Docker image to AWS ECR and ECS and use AWS Fargate to serve this Node.js web server.
How to Change DNS Nameservers from Godaddy to Point to AWS Route 53
2022/08/09·2 min readThis blog shows how to change your DNS nameservers from GoDaddy to point to AWS Route 53. Assuming you have registered a DNS domain at GoDaddy but want to host a website at AWS, this guide provides steps on how to achieve this goal.
Setting Up Next.js on AWS EC2 Instance
2021/10/02·2 min readNext.js is a React-based web application framework built on top of Node.js. AWS EC2 is Amazon's cloud computing service which hosts VMs in the cloud. In this tutorial, we will manually create an EC2 instance, SSH into it, and install and set up Next.js.
Machine Learning & AI
View all →ML Regression — House Price Prediction with Python
2026/02/24·10 min readA step-by-step guide to building a Linear Regression model for house price prediction using Python, scikit-learn, and pandas — covering EDA, feature engineering, training, and evaluation.
How to Build Your First Vertex AI Model Using AutoML
2026/01/02·5 min readA practical guide to predicting housing prices using GCP Vertex AI with AutoML Tabular.
How to Get Started with Python with Visual Studio Code
2023/03/04·2 min readThis blog describes how to get started with Python quickly so you can use Python with your work tomorrow.
How to Get Started with Python
2021/02/08·1 min readAs an experienced developer with C# and JavaScript who hasn't done any work with Python yet, my main motivation for learning Python is to learn AI and ML, as many courses require basic Python knowledge. As a beginner starting to learn Python, I searched around for good resources and will share them here.
Generate PokemonGo RPC Protos to C#
2016/07/13·2 min readHow to generate Pokemon Proto API to C# types
Python Hello World
2015/07/09·1 min readGet started with Python with a simple Hello World example.