Hi, I'm Pep

Seven years crafting iOS apps. Now building products of my own.
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Why I build alone

Build it this week. Measure it next month. Keep what people actually use.

I've spent seven years building iOS apps with great teams: flight booking at Agoda, money transfers at DeeMoney, cards at Crypto.com, and before that a startup I co-founded as CTO. Along the way I learned that the best products come from watching what real people do with them.

Now I'm putting that into practice as a solo founder from Bangkok. Instead of one big bet, I make many small ones: find a real problem, build a focused tool, and share it with the people who need it.

Then I listen to the numbers. I keep building what people find useful, learn from what doesn't land, and carry every lesson into the next one.

If you've been thinking about building something of your own: start small, and start this week.

Now building

Small products, shipped

Each one started as a real problem and shipped in weeks, not months. Here's what is live, and what's next.

CrewSchedule

A roster app for airline crew. Upload the monthly schedule slip once and get a calendar of flights, layovers and days off, and see where your layovers overlap with your squad.

Ruby on Rails
Hotwire
SQLite
Docker

Mermaid Viewer

A Mermaid live editor: write diagram code, see it render as you type, and export SVG, PNG or PDF. Runs in your browser, no sign-up.

Next.js
TypeScript
Mermaid

JSON Formatter

Format, beautify, minify and validate JSON instantly. No ads, no tracking, just a fast tool for developers.

Next.js
TypeScript

Reseller Fee Calculator

See what you keep after fees and shipping on eBay, Poshmark, Mercari and Depop for the same item, and work back from the profit you want to a list price.

Next.js
TypeScript

Creator Fee Calculator

Compare what you keep per sale and per month selling digital products on Gumroad, Etsy, Stan Store, Payhip, Lemon Squeezy, Ko-fi and Beacons.

Next.js
TypeScript

Thai Tax Saver

คำนวณภาษีเงินได้บุคคลธรรมดาปี 2569 สำหรับมนุษย์เงินเดือน ดูภาษีที่ต้องจ่าย เงินคืน และวงเงินลดหย่อน RMF, Thai ESG และประกันที่ยังเหลือ ไม่ต้องสมัคร ไม่ขายกองทุน

Next.js
TypeScript

Untitled 2D game

In progress

My first game: a small 2D project I'm building to learn game development. More to show soon.

2D
Game dev

Work Experience

Skills

Swift
SwiftUI & UIKit
React Native
TypeScript
React
Next.js
Ruby on Rails
Python & Django
Firebase
AWS
Docker
Contact

Get in Touch

Building something of your own, or curious about one of my products? I'd love to hear from you. Email me at admin@bkkdev.io or find my work on GitHub.

GitHub