Kaltun | Cloud Portfolio

What I've Built

All projects are live on AWS and managed with Terraform.

Python · AWS Serverless

Expense Tracker

A serverless expense tracking app. Add expenses, view all transactions, and get a spending summary by category, all stored in DynamoDB and served via Lambda and API Gateway.

Lambda API Gateway DynamoDB Python S3 Terraform

View Project → GitHub →

Python · AWS

Weather Dashboard

Real-time weather data app. Enter any city to get temperature, humidity and a 3-day forecast. Lambda calls the OpenWeatherMap API with keys stored securely in SSM Parameter Store.

Lambda API Gateway SSM Python OpenWeatherMap

View Project → GitHub →

JavaScript · CSS

Linux Quiz App

An interactive quiz testing Linux command line knowledge covering file systems, permissions, process management and shell scripting. Built with vanilla JavaScript and deployed to S3 via CloudFront.

JavaScript CSS HTML S3 CloudFront

View Project → GitHub →

Infrastructure as Code

Cloud Infrastructure

The entire AWS infrastructure for this portfolio: S3, CloudFront, Lambda, API Gateway, DynamoDB and IAM, provisioned with Terraform and stored in a remote S3 backend with versioning enabled.

Terraform S3 Backend CloudFront IAM GitHub

View on GitHub →

Problems I've Solved

Real issues encountered and fixed throughout this project.

Lambda proxy integration not enabled on API Gateway

API calls returned empty events. Fixed by enabling Lambda proxy integration on all API Gateway methods. Without it, the event object arrives empty and the Lambda function receives no data.

API Gateway · Lambda

Incorrect API path: /prod/expenses instead of /expenses

Requests were hitting a 404 because the stage prefix /prod was being duplicated in the URL. The stage is handled separately by API Gateway. The correct path is /expenses, not /prod/expenses.

API Gateway

Quiz logic lost when replacing questions in script.js

When updating quiz questions, the entire script.js was replaced, wiping the quiz logic. Lesson learned: always preserve existing logic and only replace the relevant section of a file.

JavaScript · Git

.terraform/ binary accidentally committed to Git

A large Terraform provider binary was committed before .gitignore was created. Resolved by rewriting Git history with git filter-branch to remove the file entirely from all commits.

Git · Terraform

WSL 2 broke WiFi on Samsung Galaxy Book2 Go (ARM64)

Installing WSL via wsl --install caused the Qualcomm WiFi adapter to show Code 45. The fix was a full PC reset, then reinstalling WSL via the Microsoft Store, the correct method for ARM64 Snapdragon devices.

WSL · Windows · ARM64

HP laptop hardware incompatible with Windows 11 update

Older HP laptop hardware did not meet Windows 11 specs, causing system crashes every few minutes after a forced update. Resolved by migrating the entire development environment to a new machine.

Hardware · Windows

VS Code WSL server crashed repeatedly on ARM64

VS Code WSL extension crashed repeatedly on the Samsung Galaxy Book2 Go with error code 0x8007274c. Fixed by running wsl --shutdown then restarting WSL from PowerShell. Known issue with ARM64 devices.

WSL · VS Code · ARM64

.terraform/ binary committed to Git again on new laptop

After setting up a new machine, the .terraform/ provider binary was committed before .gitignore was in place. Fixed again with git filter-branch to rewrite history. Lesson: always create .gitignore before running terraform init on any new machine.

Git · Terraform

Hi, I'm Kaltun

What I've Built

Problems I've Solved

Technologies & Tools I Use

Certifications

Get in Touch