Dalmlabs Billing App

• Client: Dalmlabs
• Role: Backend Developer
• Tech Stack: AWS Lambda, TypeScript, AWS SAM, API Gateway

Serverless billing and usage-metering platform for Dalmlabs' messaging products, built on AWS Lambda (TypeScript) with the AWS Serverless Application Model (SAM). Tracks usage, wallets, top-ups, subscriptions, pricing tiers, and currency conversion, and generates invoices through a ledger system, with event-driven integration across AWS SNS, DynamoDB, and S3.