Hello, I'm

Khoffan Leemanan

Junior Front-end Developer

Specializing in Flutter, Go, and Server-Driven UI architectures. I build scalable, high-performance applications that bridge the gap between complex backends and beautiful user interfaces.

Khoffan Leemanan

About Me

I am a Computer Engineering graduate from Prince of Songkla University with a passion for building robust software solutions. Currently working as a Front-end Developer (Flutter Specialist), I focus on designing system architectures that are not only functional but also maintainable and scalable.

My expertise lies in Server-Driven UI (SDUI), ensuring seamless updates and flexibility across platforms. I also possess strong backend skills in Go (Golang) and MongoDB, allowing me to contribute effectively to full-stack development and API schema design.

Technical Expertise

flutter

Frontend & Mobile

  • Flutter (Expert)
  • ReactJS / VueJS
  • Server-Driven UI
  • State Management (Bloc/Riverpod)
dns

Backend & Database

  • Go (Golang) / Python
  • Node.js / NestJS / ExpressJS
  • MongoDB / Firebase
  • RESTful API Design
build

Tools & Others

  • Git / GitHub
  • Docker / Kubernetes
  • TypeScript / JavaScript (ES6+)
  • JS Tools (Vite / Webpack / NPM)
  • Agile / Scrum

Featured Projects

Custom CMS Project

Custom CMS with Server-Driven UI

Lead Front-end Developer

Designed an innovative CMS architecture using Flutter Web, Go, and MongoDB. Implemented a Server-Driven UI Protocol (JSON-to-Widget) that allows administrators to modify layouts and logic in real-time, effectively reducing the deployment cycle.

Flutter Web Go MongoDB SDUI
Web Blog Platform

Interactive Web Blog Platform

Full-stack JavaScript Developer

Built a complete content management ecosystem leveraging the full potential of the JavaScript stack. Developed a scalable backend with Node.js (Express/NestJS) and a dynamic frontend using ReactJS/VueJS, featuring real-time content updates and a responsive reading experience.

Node.js ReactJS/VueJS MongoDB Express/Nest
AutoH Workspace Automation Engine

AutoH – Workspace Automation Engine

Python Developer

Engineered an advanced Windows automation tool for customizing work environments via Global Hotkeys. Features Multi-Mode Workspace switching (Dev/Home modes), Subprocess Isolation to prevent thread conflicts and ensure 100% memory reclaim, plus Debounce Logic & Mutex UI Lock for system integrity. Solved complex concurrency challenges with a custom Task Queue and Soft Shutdown Sequence using psutil.

Python Flet Event-Driven Subprocess psutil System Hooks
POS System

High-Performance POS System

Full-stack Developer

Engineered a robust Transaction System capable of handling high-concurrency requests using Go goroutines. Optimized MongoDB schemas for polymorphic product data, ensuring sub-200ms response times.

Go MongoDB Flutter WebSocket
Healthcare App

Health Care Management Platform

Front-end Developer

Architected a precision-critical UI and responsive UI ensuring 100% data integrity for personal health records. Collaborated closely with backend teams to design strict API Contracts and Type-Safe Data Models.

Flutter API Design Data Visualization
Multi-Merchant E-Commerce Platform

Multi-Merchant E-Commerce Platform

Full-stack Developer

Built a full-stack, multi-merchant e-commerce solution supporting both Customer and Merchant roles. Implemented RBAC with Firebase Authentication (Google & Email/Password) for secure user management, a CSV Bulk Import system using Multer and Prisma Transactions for atomic data integrity, and a Merchant Dashboard with dynamic product variants management.

React (Vite) Node.js TypeScript PostgreSQL Prisma Redux Toolkit

Experience

Jan 2025 - Present

Front-end Developer (Flutter Specialist)

Nicetynine

Leading the frontend development of enterprise-scale applications using Flutter. Architecting Server-Driven UI systems and collaborating with cross-functional teams to deliver high-quality software solutions.

Previous

Internship

Company Name

Gained hands-on experience in software development lifecycles and contributed to real-world projects.

Get In Touch

Let's Talk

Open for opportunities in Senior Full-stack Development or Flutter Specialist roles.