Saung Oo Lwin

Software Engineer | HeyGames • Architected a scalable Laravel-based middleware API to bridge multiple merchants with diverse game top-up providers using a modular adapter pattern, significantly reducing integration time for new providers. • Engineered a resilient transaction lifecycle by implementing balance reservation and database locking mechanisms to ensure concurrency safety and data integrity during high-volume periods. • Optimized high-concurrency order execution via Redis and Laravel Horizon, managing asynchronous processing, intelligent retry logic, and automated merchant callbacks. • Strengthened platform security by designing a multi-layered request flow featuring JWT authentication, IP whitelisting, and granular rate limiting. • Developed a sophisticated status reconciliation engine using a hybrid of webhooks and scheduled polling to maintain 100% synchronization between providers and merchants. • Implemented centralized logging and error classification to automatically distinguish between user errors and provider-side failures, enabling automated failover and smarter retry strategies. • Managed dynamic, multi-currency pricing engines and AWS S3-backed media handling to support merchant-specific denominations and localized digital assets.

An NFT Crowdfunding Platform designed to help builders and hackathon participants transform their projects into verifiable on-chain identities using NFTs. Each project can mint a unique NFT representing its creation, enabling transparent crowdfunding directly on the blockchain. Handled both frontend (Next.js + Wagmi + MetaMask integration) and smart contract interaction on the Polygon network.

Developed a User Management System for a Point of Sale (POS) platform, implementing role-based access control using Laravel policies and gates. This project involved managing user permissions and roles to ensure secure and efficient user access across the system.

Contributed to a large-scale corporate POS business system as a Laravel Developer. Focused on the Product module and Payment Gateway module within the Sales system. Integrated Stripe API for POS and eCommerce sales. Refactored legacy jQuery code to modern Laravel, Livewire, and Alpine.js stack.