Executive Summary
Zemen Technologies was commissioned to architect and deploy an institutional payment switch capable of routing high-throughput transactions across Ethio Telecom Telebirr, Commercial Bank of Ethiopia (CBE Birr), and EthSwitch rails.
The Challenge
The client previously experienced degraded transaction success rates during end-of-month salary disbursements and utility collection peaks. Fragmented API contracts, transient network latency, and lack of unified webhook reconciliation resulted in manual settlement investigations.
Technical Architecture
- HMAC SHA-256 Idempotency Rail: Designed an append-only transaction ledger validating payload signatures with sub-millisecond cryptographic verification.
- Resilient Retry Workers: Engineered backoff queues handling transient telecom timeouts without duplicate ledger debits.
- Automated ERCA Invoicing: Direct integration with Ethiopian electronic tax compliance frameworks, ensuring every completed transaction receives a cryptographic tax verification stamp.
Business Impact
- 99.98% production payment gateway uptime maintained across peak cycles.
- Zero duplicate transactions recorded over 14 million processed events.
- Mean response latency lowered from 3.2s to 420ms.