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Technical writing & thoughts.

17 articles

Building a LINE First Fitness Agent with AI Cost Gates

I built a fitness tracker on LINE for Thailand. My ex girlfriend and friends got hooked, then they told me the hard truth about building on a chat platform.

2 min read #architecture

Kevin Coto🚀💡 · Jul 15

A Polyglot Feedback Platform: Django, Next.js, and Elixir Working Together

I worked as a waiter and wanted a way to give restaurants honest feedback without public shaming. So I built KraowKao using three languages that each do what they do best.

2 min read #architecture

Kevin Coto🚀💡 · Jul 15

Building an AI Accountability Coach That Knows Your Habits

I wanted to fix my calendar. Instead I built an AI coach that learned my procrastination patterns better than I knew them.

2 min read #architecture

Kevin Coto🚀💡 · Jul 15

Building a Multi Platform AI Budget Coach

I was making more money but my savings were not going up. So I built DIA, a budgeting coach that lives inside Telegram, WhatsApp, and Discord.

2 min read #architecture

Kevin Coto🚀💡 · Jul 15

Building a Voice AI Receptionist for Restaurants

How I built Vozko, an AI voice receptionist that answers restaurant phones during the lunch rush. The integration nightmare, the moment it clicked, and where it is now.

2 min read #architecture

Kevin Coto🚀💡 · Jul 15

Building a Reusable Chat Infrastructure with DynamoDB Single Table Design

I built chat for one project, then another, then another. The third time I made it reusable. One DynamoDB table that powers real time messaging for any application.

2 min read #aws

Kevin Coto🚀💡 · Jul 15

Designing a Three Reviewer Consensus Platform for Digital Harm Reporting

I built a consensus platform for the South African government where three independent reviewers evaluate digital harm reports. The hard part was keeping them isolated from each other.

2 min read #architecture

Kevin Coto🚀💡 · Jul 15

Building a Real Time Sports Scoring Engine with WebSockets and DynamoDB Streams

Tennis courts in South Africa needed live scores that everyone could see instantly. DynamoDB and WebSockets made it possible.

2 min read #aws

Kevin Coto🚀💡 · Jul 15

Migrating a Production Platform from CDK to SST Without Downtime

CDK worked until it did not. I migrated Restore Blue from AWS CDK to SST with zero downtime by running both stacks in parallel.

2 min read #aws

Kevin Coto🚀💡 · Jul 15

From Dubai to Thailand: How I Landed a Remote Role at a South African Company

The Next Chapter When I left the waiter job and returned to engineering, I knew I wanted...

5 min read #career

Kevin Coto🚀💡 · Mar 30 '25

Integrating Cloudflare Turnstile with SvelteKit Forms

This post explains how to integrate Cloudflare Turnstile with a SvelteKit form using use:enhance,...

3 min read #svelte

Kevin Coto🚀💡 · Mar 14 '25

LeetCode 35: Search Insert Position. Binary Search vs Linear Scan

The problem is here My Solution: /** * @param {number[]} nums * @param {number}...

3 min read #algorithms

Kevin Coto🚀💡 · Aug 28 '24

Cleaner Function Signatures with Destructured Parameters

Let's say I have a project in three.js and I need some geometries, I will hardcode an array of...

3 min read #javascript

Kevin Coto🚀💡 · Aug 28 '24

From Software Engineer to Waiter in Dubai

My Journey in Dubai I've recently moved to Dubai, the city of luxury we all know well, but...

4 min read #career

Kevin Coto🚀💡 · Jun 20 '22

The Vue Slot Shorthand That Makes Templates Cleaner

Named Slots has a shorthand that isn't necessarily shorter but maybe cleaner. This is the regular...

2 min read #vue

Kevin Coto🚀💡 · Jun 18 '21

Simple guide of Flexbox in Real Life🔥Part #2

If you have come until here you are prepared for working with Flexbox in real projects, but first...

1 min read #css

Kevin Coto🚀💡 · May 17 '21

Simple guide of Flexbox in Real Life🔥

Flexbox is an interesting way to make layout At least better -as I see- compared to float's and other...

2 min read #flexbox