JoeKooler
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Chitsanupong Klaithin (Joe)

Product-minded Software Engineer building practical systems.

Based in Chiang Mai, Thailand. Specializing in mobile apps, web platforms, secure payment integrations, and automated AI workflows.

View Selected WorkExperience
React NativeNext.jsTypeScriptStripePostgreSQLAI Workflows
Joe@portfolio:~/services
AVAILABLE
Product-minded Software Engineer
Building practical systems across mobile, web, payments, inventory, and AI workflows.
00
Product MVP Design & Prototypingidea -> design -> prototype
01
Product MVP Engineeringidea -> working system
02
Mobile App DevelopmentReact Native / Expo
03
Web Platform EngineeringNext.js / TypeScript
04
Payments & SubscriptionsStripe / RevenueCat
05
Inventory & Operations SystemsPOS / stock / workflow tools
06
AI Workflow Prototypingprompt -> prototype -> production
React NativeNext.jsTypeScriptPostgreSQLStripeRevenueCatDockerVercel
status: available for selected remote projects
timezone: Thailand / ICT
email: chitsanupongklaithin@gmail.com
action: let's build something useful
Case Studies

Selected Work

Death Message

High-stakes Mobile Application

RevenueCat
  • Sealed private death messages unlock only after a trusted key holder verifies the user's passing.
  • Legacy Love Notes, Legacy Videos, and Final Portraits turn the app into a structured digital memorial.
  • RevenueCat powers the Seed and Rose subscription plans for expanded storage, uploads, and message limits.
#Mobile#In-App-Purchase#TypeScript
Death Message voice note screen preview

Evercred

B2B SaaS Platform

Stripe Connect
  • Built the organization portal foundation for enterprise verification flows.
  • Integrated Stripe billing and account-management logic for B2B operations.
  • Prioritized security boundaries, auditability, and long-term maintainability.
#B2B-SaaS#Stripe#Audit-Logs
Evercred physician dashboard preview

Trinket App

Consumer Multimedia App

Custom Player
  • Built Trinket v1 and v2 with React Native and Expo for elite fan collectibles and merch.
  • Spearheaded the v1-to-v2 migration and delivered a custom music-player architecture.
  • Implemented custom animations and app-wide optimization for responsive media-heavy experiences.
#Mobile#Audio#Expo
Trinket app fan profile preview
Professional Path

Timeline

Senior Software Developer

Twenty Ideas

  • • Led Cloud Marketplace (GMS) development.
  • • Death Message: Modernized via TS Migration & RevenueCat.
  • • Evercred: Developed Org portal & Stripe integration.

Software Developer

Trinket

Built Trinket v1/v2 for limited collectibles and merch, leading the migration, custom music player, animations, and performance optimization.

Full-stack Developer

Tech Combine / GoSoft

Executed large-scale Project Migration from legacy Java systems to modern React/Node stacks.

Freelance Front-end Developer

Denso

Developed Document Tagging systems and the Final Energy Visualizer dashboard.

Game / Full-stack Developer

Pi R Square

Built OIC Risk Protector, a hybrid platform combining Unity game engine with React web services.

Full-stack Developer

Klong Technology

Hino Telematics, Thailand Tourism Directory, and Larnlaby stress-relief chat platform development.

Software Engineer Intern

GISTDA

Worked on advanced Raytracing and Signal processing algorithms for satellite data.

Social Proof

Recommendations

Verified Recommendation
Former Teammate, US Software Company

"Joe is one of the strongest front-end developers I've worked with. He has sharp UI instincts, produces clean and maintainable code, and consistently delivers quality work on well-scoped tasks."

Verified Recommendation
Former Colleague, L² Test Engineer

"Joe handled every issue with a calm and professional attitude. His technical skills, clear communication, and willingness to help made a significant impact on the project's success."

Verified Recommendation
Former Teammate, CTO at Trinket

"An exceptionally dedicated, independent, and intelligent developer. He thrives in a team environment and is highly receptive to feedback. I wholeheartedly recommend Joe."

View All Recommendations

Let's build practical software that actually works in the real world.

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