SIM Billing

Overview

A SIM billing platform that processes user, device, and subscription-related data through telecom provider integrations, including AT&T and C2, with payment workflows handled through Stripe.

The platform connects internal systems with external provider APIs and payment infrastructure to support billing operations, service activation, subscription updates, and data synchronization across multiple external systems.

Built for production use, the system emphasizes accurate handling of API responses, payment states, billing records, retries, and edge cases, so user and subscription information stays consistent and predictable end to end.

My Contribution

• Built backend services for SIM billing, telecom provider integrations, and payment workflows.
• Processed user, device, and subscription-related data through AT&T and C2 provider APIs.
• Integrated billing-related workflows with Stripe payment infrastructure.
• Implemented validation and transformation logic for user and billing records.
• Handled external API responses, payment states, errors, and edge cases.
• Improved reliability around retries, failures, and data consistency across multiple systems.