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# Auto-Recharge System

`Optus | April 2025`

* Built an event-driven Auto-recharge system on Kafka and PostgreSQL, processing 100K+ transactions/week asynchronously with reliable, scalable throughput.
* Automated scheduled and low-balance recharge triggers with retry policies to handle failures gracefully.
* Integrated an external payment service with idempotency keys for exactly-once payment processing on retries.