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Muh. Khaerul's avatar
Muh. Khaerul
proPurwokerto, Indonesia
AI Backend Automation Engineer for APIs, MVPs & Workflow
New to Contra
AI Backend Automation Engineer for APIs, MVPs & Workflow
Cover image for In 2024, I built Krungthai
In 2024, I built Krungthai Business ExpressTS, a backend API prototype/MVP for an Upwork client working around Krungthai Business workflows. The goal was to validate how an end-to-end business banking flow could be automated while the bank does not provide official open banking APIs. My approach started with reverse engineering the mobile app flow to understand the real request/response behavior, session handling, authentication steps, and the app’s end-to-end encryption flow. This included analyzing how encrypted payloads were structured, how secure client-server communication was handled, and how the mobile client interacted with backend services during the transaction process. From there, I designed an ExpressTS-based API layer that could reproduce the core E2E flow in a cleaner backend structure, making it easier to test, automate, and integrate with external systems. The prototype focused on validating the technical flow first before moving toward a more production-ready implementation. The first approach used an OTP-based transaction flow, but I later updated the implementation toward a PIN-based flow. This made the transaction process faster and smoother for repeated usage, with the PIN flow becoming around 2–3x faster than the OTP flow because it removed the delay of waiting for OTP delivery and validation. The GitHub repository was used as a prototype/demo version for the Upwork client, focused on validating the feasibility of automating Krungthai Business workflows. Tech stack: Node.js, TypeScript, ExpressTS, Axios, Mongoose, MongoDB, dotenv, pnpm, ts-node, nodemon. If you need someone who can build backend API prototypes, reverse engineer mobile/web flows, automate complex business processes, or create integration layers when official APIs are limited or unavailable, I can help turn the flow into a clean, testable, and scalable backend system. This was an independent prototype project for client validation and research purposes, not an official Krungthai Bank product or partnership.
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Cover image for HLVote: Mobile E-Voting Platform Development
HLVote: Mobile E-Voting Platform Development
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Cover image for PKLSkuy — Construction Worker Marketplace Platform
PKLSkuy — Construction Worker Marketplace Platform
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Nizar Ali's avatar
Nizar Ali
Purwokerto, Indonesia
Crafting intuitive and modern web interfaces.
$1k+
Earned
1x
Hired
1
Followers
Crafting intuitive and modern web interfaces.
Cover image for Personal Website Portfolio
Personal Website Portfolio
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Cover image for [Hero] AI-Powered Agency Website
[Hero] AI-Powered Agency Website
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Cover image for Thesis AI Assistant
Thesis AI Assistant
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Cover image for [Animation] Profile Dropdown Menu
[Animation] Profile Dropdown Menu
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Faik Irkham's avatar
Faik Irkham
Cilacap, Indonesia
Mobile App Developer | Flutter Expert
Mobile App Developer | Flutter Expert
Cover image for The main focus of this project was a clean UI/UX, smooth ani...
The main focus of this project was a clean UI/UX, smooth animations (check out those subtle transitions!), and warm branding.
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Cover image for Fluty POS A Fully Offline Point of Sale System Built entirel...
Fluty POS A Fully Offline Point of Sale System Built entirely with Flutter, this POS application is designed for small businesses that need a fast, lightweight, and reliable cashier system that works without any internet connection. Key Features: ✔️ 100% Offline – all data stored locally using SQLite ✔️ Product & category management ✔️ Fast and accurate transaction processing ✔️ Automatic inventory updates ✔️ Daily & monthly sales reports ✔️ Simple and responsive UI ✔️ Perfect for small shops, retail stores, coffee shops, and more
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Cover image for FlutIoT is a Smart Home application built with Flutter, feat...
FlutIoT is a Smart Home application built with Flutter, featuring a modern, responsive, and cross-platform interface for both Android and iOS. Technology Stack: - Flutter & Dart for cross-platform development - Firebase Authentication for secure login - REST API / MQTT for IoT device communication -BLoC for state management - Flutter Charts for energy analytics visualization
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Cover image for chart finance
chart finance
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Rizal Gradian's avatar
Rizal Gradian
Purwokerto, Indonesia
UI/UX Designer crafting high-quality design for product
UI/UX Designer crafting high-quality design for product
Cover image for Luniate
Luniate
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Cover image for UAE Polo Mobile Apps
UAE Polo Mobile Apps
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Cover image for NFT Landing Page
NFT Landing Page
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Cover image for Cubit Case Study
Cubit Case Study
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Dhika Endi Astowo's avatar
Dhika Endi Astowo
Purwokerto, Indonesia
UI Designer | Design System | Figma | Website SaaS
UI Designer | Design System | Figma | Website SaaS
Cover image for Alumea Skincare E-commerce
Alumea Skincare E-commerce
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Cover image for End Point Electrical Website Design
End Point Electrical Website Design
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Cover image for Financial Data Visualization
Financial Data Visualization
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Cover image for Cybersecurity Risk Assessment Dashboard UI
Cybersecurity Risk Assessment Dashboard UI
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