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Worrachatr Phoonbamphen

@worrachatrph

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Full-Stack Engineer — TypeScript, React / React Native, Node.js, Firebase · LLM features in production

Thailand

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What I'm looking for

Remote full-time backend or full-stack role on a product team, ideally building LLM features: prompts, tool calling, context and memory, and the TypeScript backend behind them. I want to own problems end to end, from root cause to shipped and measured fix, where reliability and data security matter. Based in Thailand (GMT+7).

I build and run FixIt, a live repair-services marketplace in Thailand on web, iOS and Android. I own it end to end: React Native / Expo front end, TypeScript Cloud Functions, database security rules, scheduled jobs, SMS and push pipelines, and two Claude-powered features: a service-matching assistant that uses forced tool calls with validated output, and a support bot that hands off to a human.

I came to software after 18 years as an engineer and flight dispatcher: R&D, process and quality engineering at Fujitsu, Sony and others, then 11 years planning flights at Thai Airways. That background shows in how I work. I find the real cause, prove the fix, and measure the result. I also do independent security research, so access control and data scoping are part of my designs from the start.

Looking for a remote full-stack or backend role, especially work on LLM-powered products.

Experience

Work history, roles, and key accomplishments

Current

Independent Security Researcher

Current

Self Employed

May 2025 - Present (1 year 4 months)

Conducted web, API, and smart-contract security testing through public bug bounty programmes.

Web Security API Security Smart Contract Security Bug Bounty

Current

Full-Stack Engineer

Current

Phenovative Studio

May 2025 - Present (1 year 4 months)

Built FixIt, a live home-services marketplace on web, iOS and Android, including React Native app, TypeScript Cloud Functions, Firestore security rules, scheduled jobs, SMS and push notifications, and admin tools. Added two Claude features to production: service matching from customer descriptions and a support bot with human handoff.

React Native Expo TypeScript Cloud Functions Firestore Security Policies Scheduled Jobs SMS Push Notifications Admintool Claude API Integration

Flight Dispatcher

Thai Airways International

Jan 2011 - Oct 2022 (11 years 9 months)

Performed flight planning including routes, fuel, weather, NOTAMs, payload and regulatory limits, and monitored flights in the air.

Flight Plan Operations Fuel Management Weather Analysis NOTAMs Payload Management Regulatory Compliance Flight Tracking

Quality Engineer

Sony

Jan 2009 - Jan 2011 (2 years)

Performed quality engineering for DSLR camera production.

Quality Engineering DSLR Cameras Production Quality

Maintenance Engineer

Rohm Integrated

Jan 2007 - Jan 2009 (2 years)

Maintenance engineering role at Rohm Integrated.

Process Engineer

Nidec

Jan 2006 - Jan 2007 (1 year)

Performed process engineering for electric motor production.

Process Engineering Electric Motors Production

Process Engineer

Delta Electronics (Thailand)

Jan 2005 - Jan 2006 (1 year)

Performed process engineering for PCB assembly.

Process Engineering PCB Assembly

R&D Engineer

Fujitsu

Jan 2004 - Jan 2005 (1 year)

Performed R&D for hard-disk drives.

R&D Hard Disk Drives

Education

Degrees, certifications, and relevant coursework

freeCodeCamp

JavaScript Algorithms and Data Structures, Computer Science

2023 - 2023

Completed the JavaScript Algorithms and Data Structures certification, covering fundamental programming concepts and data structures.

IBM

Full-Stack & DevOps Course Track, Full-Stack Development and DevOps

2022 - 2022

Activities and societies: Completed courses: Getting Started with Git & GitHub; Linux Commands & Shell Scripting; Python for Data Science, AI & Development; Developing AI Applications with Python and Flask; Containers with Docker, Kubernetes & OpenShift; Application Development using Microservices and Serverless; Continuous Integration and Continuous Delivery (CI/CD); Introduction to Agile Development and Scrum; Test and Behavior Driven Development.

Completed a full-stack and DevOps course track with nine course certificates, covering topics such as Git, Linux, Python, Docker, Kubernetes, microservices, CI/CD, and Agile development.