Maxis E-Invoice

Overview

Maintained and enhanced the Maxis E-Invoice back-end for scalability. Engineered a PDF worker generating 20M PDFs in 30 days, cutting BigQuery calls by 90%. Designed a cancellation system handling 36K invoices in 2 days. Automated scheduled PDF generation and invoice table submissions.

What I built

• Maintained and enhanced the Maxis E-Invoice back-end for scalability and high performance.
• Engineered a PDF worker generating 20M PDFs in 30 days, cutting BigQuery calls by 90% and improving speed by 60% with batch processing.
• Designed a cancellation system handling 36K invoices in 2 days under IRBM 12 RPM with 90% success.
• Automated scheduled PDF generation of 500 PDFs in approx. 3 minutes, batching every 30s for optimized throughput.
• Delivered a document search feature, reducing retrieval time and improving accessibility.
• Automated invoice table submissions, streamlining workflow and reducing manual effort.
• Added a duplicate submission prevention mechanism for IRBM, improving reliability.
• Integrated XML submissions with webhooks for real-time updates and seamless SAP tracking.
• Implemented TIN validation to ensure compliance and data accuracy.
• Supported invoice cancellation, credit notes, and self-billed credit notes.
• Created reconciliation workflows with CSV files from GCP buckets to resolve inconsistencies.
• Converted documents into UBL 2.1 format for standardized e-invoicing.
• Built a data pipeline with a webhook listener, storing PDF status in BigQuery for analytics.
• Added QR code generation for invoices and merged it into HTML-based PDF templates.